Multiple sclerosis


An in-depth report on the causes, diagnosis, and treatment of MS.

Alternative Names


What Is Multiple Sclerosis?

  • Multiple sclerosis (MS) is a chronic disease that affects the central nervous system. MS is thought to be an autoimmune disease. In MS, the body’s immune system produces cells and proteins (antibodies) that attack myelin, a fatty substance that protects nerve fibers.
  • The cause of MS is not known. It is not an inherited disease, but it appears that genetic factors make some people more susceptible to developing MS.
  • MS affects significantly more women than men. Most patients first notice symptoms between the ages of 20 - 50.
  • The course of MS varies among patients. The disease may be mild, moderate, or severe. Most patients have the relapsing-remitting form of MS in which flare-ups (also called relapses or exacerbations) of symptoms are followed by periods of remission.
  • Symptoms of MS include fatigue; vision problems; difficulty walking; muscle weakness, stiffness, and spasms; and bladder and bowel problems. Not all patients have all symptoms.


Patients with multiple sclerosis are treated with medications and rehabilitation. Nine disease-modifying drugs are approved to treat multiple sclerosis. These drugs can help reduce the frequency and severity of relapses and slow disease progression and disability. Drugs approved by the Food and Drug Administration (FDA) are:

  • Interferon beta-1b (Betaseron, Extavia)
  • Interferon beta-1a (Avonex)
  • Interferon beta-1a (Rebif)
  • Glatiramer acetate (Copaxone)
  • Natalizumab (Tysabri)
  • Mitoxantrone (Novantrone)
  • Fingolimod (Gilenya)
  • Teriflunomide (Aubagio)
  • Dimethyl fumarate (Tecfidera)

Drug Approvals

In 2013, the FDA approved dimethyl fumarate (Tecfiderea), the third new oral treatment for relapsing forms of MS. .

Natalizumab (Tysabri) and PML

Progressive multifocal leukoencephalopathy (PML), a rare neurological disorder, is a concern for patients treated with natalizumab (Tysabri). In recent years, researchers have learned that PML only occurs in people who have been exposed to the JC virus. A blood test is available to determine if a patient carries antibodies to this virus.

“Liberation Therapy” Fails First Randomized Trial

In results presented at the 2013 meeting of the American Academy of Neurology, researchers announced that “liberation therapy” failed to help any patients in a small pilot study, and worsened symptoms in several patients. Liberation therapy uses balloon angioplasty to widen veins in the chest and neck. The FDA warns that this surgical procedure is an unproven and unsafe treatment for MS.


Multiple sclerosis (MS) is a neurological disease that involves the central nervous system (CNS), the nerves that comprise the brain and spinal cord. The MS disease process has two main features:

  • Destruction of myelin, a fatty insulation covering the nerve fibers, is the main characteristic of MS. The end results of this process, called demyelination, are multiple patches of hard, scarred tissue called plaques or lesions. Sclerosis comes from the Greek word skleros, which means hard.
  • Damage of axons, the fibers that carry electric impulses away from a nerve cell, is also a major factor in the permanent disability that occurs with MS.
Myelin and nerve structure

The symptoms, severity, and course of MS vary widely depending partly on the sites of the plaques and the extent of the demyelination.

Autoimmune Disease Process

Multiple sclerosis is thought to be an autoimmune disorder. In autoimmune diseases, immune factors attack the body’s own cells. In the case of MS, the immune system attacks the tissues that make up myelin. The damage to myelin, and nerve fibers (axons), is caused by over-active T cells. T cells are a type of white blood cell called lymphocytes.

Types of Multiple Sclerosis

Doctors generally group multiple sclerosis into four major disease course categories:

  • Relapsing-Remitting MS. Relapse-remitting MS (RMSS) is the most common form of multiple sclerosis. About 85% of patients are first diagnosed with this type of MS. RMSS is marked by flare-ups (also called relapses or exacerbations) of symptoms followed by periods of remission when symptoms improve or disappear.
  • Secondary-Progressive MS. Some patients with RMSS go on to develop secondary-progressive (SPMS). (For many patients, treatment with disease-modifying medications helps delay this progression.) In SPMS, the disease course continues to worsen with or without periods of remission or leveling off of symptom severity (plateaus).
  • Primary-Progressive MS. About 10% of patients are diagnosed with primary-progressive MS (PPMS). In PPMS, symptoms continue to worsen gradually from the very beginning. PPMS has no relapses or remissions. There may be periods of occasional plateaus. This type of multiple sclerosis is more resistant to the medications typically used to treat the illness.
  • Progressive-Relapsing MS. Progressive-relapsing MS (PRMS) is a rare form of MS, occurring in less than 5% of patients. It is progressive from the start with intermittent flare-ups of worsening symptoms along the way. There are no periods of remission.


As with other autoimmune disorders, the exact cause of MS is unknown. A combination of environmental and genetic factors likely plays a role.

Genetic Factors

Multiple sclerosis is not hereditary, but genetic factors appear to make some people more susceptible to the disease. The most significant genetic link to MS occurs in the major histocompatability complex (MHC), a cluster of genes on chromosome 6 that are essential for immune system function. A much smaller percentage of MS cases may be due to variations in interleukin-7 (IL-7) and interleukin-2 (IL-2) gene receptors, which are also related to immune system regulation.

Environmental Factors

Multiple sclerosis is more common in certain geographical areas of the world, particularly areas that are farther from the equator. Prevalence is generally highest in northern European and North American countries. The clustering of MS cases in these regions has led researchers to investigate whether certain toxins, infections, or vitamin deficiencies (such as vitamin D) may play a factor in triggering MS in genetically susceptible people.

Infectious organisms, mainly viruses, have long been suspects. They include Epstein-Barr virus (the cause of mononucleosis), herpesvirus 6, herpes simplex virus, influenza, measles, mumps, varicella-zoster virus, cytomegalovirus, respiratory syncytial virus, and Chlamydia pneumoniae. However, no direct link has been proven between these infections and multiple sclerosis. There is no evidence that any type of vaccination causes multiple sclerosis.

Risk Factors

About 400,000 Americans and 2.5 million people worldwide suffer from MS.


MS usually first appears between the ages of 20 and 50, with an average age of about 30. It rarely develops before age 15 or after age 60.


MS is about 2.5 times more common among women than men. The gender gap is strongest among people who develop MS at a younger age. However, some research indicates that men may be more disabled by the disease than women.

Race and Ethnicity

Multiple sclerosis occurs worldwide but is most common in Caucasian people of northern European origin, especially those of Scottish descent.

Family History

A family history of the disease may put some people at risk for MS, although the risk for someone inheriting all the genetic factors associated with MS is only about 2 - 4%. Some research indicates that family members who have MS tend to develop the disease at around the same age. However, family history does not predict whether one family member will experience the same disease severity as another family member.

Possible Protective Factors

Estrogen and Oral Contraceptives. Higher estrogen levels may temporarily lower the risk of developing multiple sclerosis. Studies indicate that oral contraceptives (which contain estrogen) and pregnancy delay the onset of multiple sclerosis. The risk for a first clinical attack increases, however, in the first 6 months after a woman gives birth.


Multiple sclerosis is not a fatal disease. Except in rare cases of severe disease, most people with multiple sclerosis have a normal or near-normal life span and usually die from the same conditions (heart disease or cancer, for example) that affect the general population. Still, MS symptoms can negatively affect quality of life. Suicide rates among patients with MS are higher than average.

The majority of patients with MS do not become severely disabled. Twenty years after diagnosis, about two-thirds of people with MS remain ambulatory and do not need a wheelchair, although many of them may use a cane or crutches for walking assistance. Some patients use an electric scooter or wheelchair to help cope with fatigue or balance problems.

The severity of the disease, and how the disease progresses, varies widely from patient to patient and is unpredictable. About 20% of patients remain asymptomatic or become only mildly symptomatic after an initial clinical event. Another 20% experience a rapidly progressive condition. Most patients will have some degree of disease progression. Women tend to have a better outlook than men.

Factors that determine a higher risk for a severe condition include:

  • Age over 40 years at the time of onset of symptoms
  • Initial symptoms that affect motor control, mental functioning, or urinary control
  • Initial symptoms that affect multiple regions of the body
  • Attacks in the first years that are frequent, or a short time between the first two attacks
  • Incomplete remissions
  • Rapid progression to disability
  • MS that is progressive from the beginning or becomes progressive shortly after the onset


Symptoms of multiple sclerosis appear in a variety of ways. Most patients first have a single attack of symptoms, a neurological episode called a clinical isolated syndrome, which typically occurs between the ages of 20 and 50. Initial symptoms may be mild enough that patients do not always seek medical care.

Once a second attack occurs, the patient is considered to have relapsing-remitting multiple sclerosis. Much less commonly, the disease is progressive from the start, with the patient having more or less continuous symptoms.

Symptoms in multiple sclerosis depend on the location of the nerve lesion. Not all symptoms affect all patients.

Early Symptoms

Symptoms more likely to occur earlier in the disease include:

  • Vision Problems. Optic neuritis, inflammation of the nerves in the eye, is a common early symptom. Patients may initially experience blurred or double vision, usually because of problems with one eye. As the condition progresses, vision loss increases, although total blindness is rare.
  • Tingling and Numbness Sensations. Tingling, crawling or burning sensations, or loss of sensation can occur. Patients may feel sensations of intense heat or cold. Symptoms often begin at the end of the legs or arms and move up towards the beginning of the limb. L’Hermmitte’s sign, which is caused by lesions in the cervical spine in the neck, is an electrical buzzing sensation that runs down the back and into the legs. It occurs when bending the neck forward.
  • Muscle Weakness and Spasms. Patients can feel weakness, clumsiness, or heaviness in the limbs. They may have difficulty with finger dexterity. Muscle spasms and stiffness (spasticity), particularly in the legs, occur in an initial attack of MS in nearly half of patients.
  • Problems with Balance and Coordination. Patients have an unsteady gait and difficulty walking normally and keeping their balance. They may have trouble grasping small objects. These problems can be compounded by other common MS symptoms, such as dizziness and tremor. Ataxia (lack of muscle coordination) and tremors (shaking or trembling of limb) affect up to half of patients.
  • Fatigue. Fatigue is the most common and debilitating symptom of MS and often occurs early in the disease. Fatigue is typically worse in the late afternoon and improves in the early evening.

Other Common Symptoms

Other common symptoms that progress over time include:

Bladder and Bowel Problems. Some patients have problems emptying their bladder (urinary retention) and bowels (constipation) or find they

and bowels (incontinence). Patients with urge incontinence need to urinate frequently or are unable to reach the bathroom before leakage occurs. Bladder problems, and catheterization for urinary retention, can lead to .

Pain. Most patients have pain at some point during the course of the disease, and many are never completely pain free. MS causes many pain syndromes; some occur for a short time while others continue for a long time. Some worsen with age and disease progression. Pain syndromes associated with MS include trigeminal (facial) pain, powerful spasms and cramps, pressure pain, stiffened joints, and a variety of sensations, including feelings of itching, burning, and shooting pain.

Sexual Dysfunction. Sexual dysfunction is a common problem. Men are likely to have erectile dysfunction, and women often have problems with vaginal lubrication. Sexual dysfunction appears to be highly associated with urinary dysfunction.

Speech and Swallowing Problems. Up to half of patients have trouble chewing or swallowing. Some patients have slurred speech and problems speaking clearly.

Thinking, Concentration, and Memory Problems. Cognitive problems, such as having trouble concentrating, reasoning, and solving problems, affect about half of patients. Many patients have problems with memory. These disabilities can create difficulties in the workplace.

Mood Swing.

is very common and is sometimes very severe. Depression can be caused both by physical changes in the brain as well as emotional response to the of dealing with MS. Less commonly, psychosis can occur. About 5% of patients with severe MS have uncontrolled and extreme mood swings where they alternate between uncontrollable laughing and weeping (pseudobulbar affect).

Possible Symptom Triggers

Some patients find that MS flares (relapses) are triggered by certain factors. Possible symptom triggers include.

Infections. Viral and bacterial infections, including urinary tract infections, may provoke MS symptoms.

Heat and Cold. Sudden changes in temperature or humidity can trigger symptoms. Many patients with MS have heat intolerance and find that heat worsens their symptoms.

Stress. Many patients report that stress worsens their symptoms.


Most patients first seek medical help after an initial attack of symptoms, called a clinically isolated syndrome (CIS). Not all patients who have a CIS go on to develop MS, and it is difficult to predict which patients will or will not.

Multiple sclerosis can be challenging to diagnose as there is no single test for it, and a number of other conditions may mimic its symptoms. To confirm a diagnosis of multiple sclerosis the doctor needs to find:

  • Evidence of nerve damage in at least two different areas of the central nervous system (brain, spinal cord, and optic nerves)
  • Evidence that the damage occurred in episodes that happened at least one month apart
  • No evidence that the damage is caused by other conditions

A diagnosis of multiple sclerosis is based on results from a combination of various tests. These include the patient’s medical history, neurological exam, magnetic resonance imaging (MRI) scans, evoked potential tests, and possibly a spinal fluid test.

Medical History

The doctor will ask about your personal and family medical history, including lifestyle factors, prescription or other drug use, and other medical conditions that you or your relatives may have had. The doctor will ask you to describe your symptoms, when they occurred, and how long they lasted.

Neurological Exam

In a neurological exam, the doctor will test your vision and reflexes and evaluate balance, coordination, and muscle strength.

Evoked Potential (EP) Tests

The evoked potential (EP) test is a simple and painless electrical test of nerve function that assesses how long it takes nerve impulses from the eye, ear, or skin to reach the brain. It involves having electrodes placed on the scalp over specific areas of the brain that process sensory information. EP tests can be used to evaluate nerve transmission for vision, sound, or muscle responses in the legs or arms.

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) scans are important diagnostic tools in MS and are used for diagnosing multiple sclerosis, tracking changes over time, and helping to determine treatment effectiveness.

MRIs scans can detect bright patches that indicate areas of damaged myelin and injured tissue (lesions) caused by MS. However, about 5% of people who are confirmed to have multiple sclerosis based on other diagnostic criteria, do not show evidence of lesions in an initial MRI.

Once diagnosed, periodic follow-up MRIs can be used to track the disease and effectiveness of treatments in two ways:

  • By distinguishing new lesions from old ones
  • Revealing increasing or decreasing numbers of lesions within the central nervous system over time

Cerebrospinal Fluid Analysis

A spinal fluid test cannot by itself confirm or exclude multiple sclerosis but it can be useful when combined with other tests. Obtaining a sample of spinal fluid requires a lumbar puncture (also called spinal tap). Spinal fluid in patients with MS usually contains unusually high levels of immunoglobulin G (IgG) antibodies as well as other proteins and fragments of myelin. These can be signs of an autoimmune disorder, but not necessarily multiple sclerosis.

Lumbar puncture - spinal tap

Ruling Out Other Disorders

The symptoms of MS overlap with a number of other diseases that must be ruled out. These conditions include stroke, alcoholism, emotional disorders, Lyme disease, chronic fatigue syndrome, fibromyalgia, AIDS, cervical spondylosis, certain neurologic degenerative illnesses, transverse myelitis, and certain other autoimmune disorders (hypothyroidism, scleroderma, Sjogren syndrome, vasculitis, and systemic lupus erythematosus).


The goals of treatment for multiple sclerosis are:

  • Modify the disease course by reducing the number and severity of relapses (also called exacerbations or flares), reducing accumulation of lesions, and slowing the progression of disability
  • Treat relapses on a short-term as-needed basis
  • Manage symptoms

Patients are recommended to seek care from a neurologist experienced in treating multiple sclerosis.

Early Treatment. Evidence strongly suggests that the most destructive changes in the brain occur very early on in the MS disease process -- and may cause considerable damage even before symptoms begin.

Many doctors recommend treatment after a first neurological episode of MS (a clinically isolated syndrome) using disease-modifying drugs. The best current approach is to use specific findings from MRI scans to determine patients at highest risk for progression, making them likely candidates for early treatment with these drugs.

Over a third of patients will progress even with immediate treatment, but without early treatment about half of patients will progress to clinically identifiable multiple sclerosis.

Treatment with Disease-Modifying Drugs

Nine disease-modifying drugs are approved by the FDA for treatment of multiple sclerosis:

  • Interferon beta-1b (Betaseron, Extavia). Given in subcutaneous (under the skin) injections every other day.
  • Interferon beta-1a (Avonex). Given as weekly intramuscular injections.
  • Interferon beta-1a (Rebif). Given in subcutaneous injections three times a week.
  • Glatiramer acetate (Copaxone). Given daily in subcutaneous injections.
  • Natalizumab (Tysabri). Given by intravenous infusion once every four weeks.
  • Mitoxantrone (Novantrone). Given intravenously once every three months for 2 - 3 years at most.
  • Fingolimod (Gilenya). Taken daily as a pill.
  • Teriflunomide (Aubagio). Taken daily as a pill.
  • Dimethyl fumarate (Tecfidera). Taken twice daily as a pill.

The interferon drugs (Betaseron, Extavia, Avonex) and glatiramer acetate (Copaxone) are given by self-injection at home. Natalizumab (Tysabri) and mitoxantrone (Novantrone) are given by injection in a hospital or medical clinic setting. Fingolimod (Gilenya), teriflunomide (Aubagio), and dimethyl fumarate (Tecfidera) are taken orally as pills.

Most of these drugs are taken on a long-term basis. They can help reduce disease activity and progression for relapse-remitting MS (the most common form of MS) and other types of MS that have relapses (secondary-progressive MS, progressive-relapsing MS). At this time, there are no proven treatments for primary-progressive MS. Disease-modifying drugs can have significant side effects.

If disease-modifying drugs do not work, doctors may try other drugs that are not specifically approved for MS. They include intravenous immunoglobulin (IVIg), methotrexate, azathrioprine (Imuran), and cyclophosphamide (Cytoxan).

Treating Acute Relapses

A relapse (also called exacerbation or flare-up) is an attack that brings about new symptoms or worsening of old symptoms. It is caused by inflammation in the central nervous system. Relapses can be mild or severe. They may last from a few days to several months.

Pseudoexacerbations are temporary worsening of symptoms that are usually caused by an external trigger, such as infection, heat, or stress. Pseudoexacerbations do not involve myelin inflammation and symptoms usually subside within 24 hours. To be considered a true relapse or exacerbation, symptoms and neurological signs must last at least 24 hours and occur at least 30 days after a previous attack.

Not all acute relapses require treatment. For attacks that are severe, a short course of high-dose corticosteroid drugs is the standard treatment. Typically, intravenous methylprednisolone (IVMP) is given for 3 - 5 days. Sometimes this is followed by oral prednisolone for a few days. Long-term treatment with corticosteroids is not recommended. These drugs can cause serious side effects and do not have any effect on MS disease progression.

Other treatment options for relapses are injections of adrenocorticotropic hormone (ACTH) and plasmapheresis (plasma exchange). These treatments are usually reserved for a small percentage of patients with very severe symptoms who do not respond to steroid drugs.

Treating Symptoms

MS symptoms are managed through a combination of treatment approaches that include medications, self-care, and physical and occupational therapy.

Drugs that are specifically approved for treating symptoms associated with MS include:

  • Dalfampridine (Ampyra) is approved to improve walking in patients with MS. In clinical trials, patients treated with dalfampridine had faster walking speeds than patients who received placebo. Dalfampridine is taken as a pill. The drug may cause seizures.
  • Onabotulinumtoxin A (Botox) is approved to treat upper limb spasticity in the flexor muscles of the elbow, wrist, and fingers. It is also approved to treat urinary incontinence associated with certain neurological conditions, including multiple sclerosis. Botox is given by injection.
  • Baclofen (Lioresel, Gablofen) is approved to treat severe spasticity. It is given orally in pill form, and for severe spasticity it can be injected intrathecally (into the spinal fluid) through a surgically implanted pump.

Investigational Treatments

New Medications. New types of injectable and oral drugs for multiple sclerosis are currently being investigated in clinical trials.

Stem Cell Transplantation. Investigators are studying the possible benefits of stem cell transplantation procedures. Stem cells are produced in the bone marrow and are the early forms for all blood cells in the body (including red, white, and immune cells). Early studies indicate that stem cell transplantation may slow MS progression. Larger randomized controlled trials are currently under way.

Unproven Treatments. Patients with MS should be highly skeptical about treatments touted for MS that are unproven, have not been rigorously investigated, and have scant scientific evidence for safety or efficacy. In 2012, for example, the FDA warned of injuries and deaths associated with “liberation therapy.” This surgical procedure uses balloon angioplasty devices or stents to widen veins in the chest and neck associated with chronic cerebrospinal venous insufficiency (CCSVI). However, there is no proven link between CCSVI and MS. The procedure has caused stroke, nerve damage, and death in several patients. Results from the first randomized trial found the procedure did not help any patients and worsened symptoms in several patients.  


Interferon Beta Drugs

Interferons (so-called because they “interfere” with viral replication) suppress inflammatory factors in the immune system that are associated with the attack on myelin. Interferon drugs are the main treatments for relapsing-remitting MS. Doctors recommend that these medications be used early in the course of the disease and continued indefinitely, unless they produce no benefits or have severe side effects. When the drug is discontinued, disease activity may increase.

Brands. Interferon drugs used for MS are interferon beta-1b (Betaseron, Extavia) and interferon beta-1a (Avonex, Rebif). Avonex and Rebif are the same chemical, but Avonex is given as weekly intramuscular injection and Rebif is taken as subcutaneous injections three times a week.

Side Effects. Side effects include:

  • Flu-like symptoms. Flu-like symptoms (fever, chills, sweating, muscle aches, and fatigue) following injection are a common complaint. These symptoms usually lesson over time. Taking acetaminophen (Tylenol) before the injection can help.
  • Injection site reactions. Pain, redness, and swelling can occur at the injection site. Applying ice or a cool compress to the skin a few minutes before injection can help prevent pain.
  • Less common side effects include allergic reactions, depression, mild anemia, low white blood cell counts, and liver abnormalities. Patients who take interferon drugs should have a baseline liver function test at the start of treatment and receive periodic testing afterwards. Patients should avoid alcohol.

Neutralizing Antibodies That Reduce Effectiveness. Over time, people taking interferons develop antibodies to the drugs, some of which can neutralize their effects. The risk for neutralizing antibodies (NAbs) increases with higher doses and greater frequency of use. Interferons injected under the skin (Betaseron, Rebif) are more likely to produce neutralizing antibodies than Avonex, which is injected into a muscle. Patients who have this reaction may be treated with an alternative interferon or with glatiramer, which has an extremely low risk, for NAbs. Often after switching drugs, NAb levels decline, and the patient may be able to return to the original interferon.

Glatiramer Acetate (Copaxone)

Glatiramer acetate (Copaxone) is a synthetic molecule that resembles a basic protein found in myelin. It is used as a decoy to trick white blood cells into attacking it instead of myelin. It is approved to help reduce the frequency of relapses in patients with relapse-remitting MS. It comes in pre-filled syringes and is given by subcutaneous (under the skin) injections.

The best results are for patients in early stages of MS, but the longer patients remain on the drug, the greater the improvement. Benefits have lasted for years. Glatiramer acetate appears to work as well as interferon beta drugs in decreasing the number and severity of relapses, but it may have less effect on lesions.

Side Effects. Side effects may occur right after the injection. They include pain at the injection site, chest pain, rapid heartbeat, flushing, anxiety, and shortness of breath.

Natalizumab (Tysabri)

Natalizumab (Tysabri) is a monoclonal antibody drug approved for treatment of MS. Monoclonal antibodies (MAbs) are drugs that target specific antibodies involved with the immune response. Natalizumab should only be taken by patients who have not responded to or who cannot tolerate other disease-modifying drugs. Natalizumab can only be taken alone, not in combination with other immune-modifying drugs. The drug is given by IV infusion once every 4 weeks.

Many patients who take natalizumab have reported great improvement in reduction of MS relapses and the drug appears to work well in slowing disease progression. However, natalizumab does carry risks for potentially serious side effects.

Common Side Effects. Common side effects include headache, fatigue, depression, joint pain, abdominal and chest discomfort, along with urinary tract, pneumonia, and other infections.

Severe Side Effects. Patients who take natalizumab must be monitored for signs of progressive multifocal leukoencephalopathy (PML). PML is a rare neurological disease that can affect people with compromised immune systems. 

Three factors increase the risk for PML:

  • The presence of anti-JCV antibodies. The John Cunningham (JC) virus is a common and normally harmless virus. However, in people with weakened immune systems, the JC virus can cause PML. PML only occurs in people who have been exposed to the JC virus. Your doctor can use the Stratify JCV Antibody ELISA blood test to determine if you have JC virus antibodies (a sign of exposure). If you test negative, you should continue to be tested regularly while taking natalizumab. If you test positive, discuss with your doctor your risks of developing PML while on natalizumab.
  • Longer duration of natalizumab treatment. The risk for PML appears to increase when patients receive more than 24 natalizumab infusions (2 years of treatment).
  • Prior treatment with an immunosuppressant drug (such as mitoxantrone, azathioprine, methotrexate, cyclophosphamide, or mycophenolate) increases the risk for PML. .

Symptoms of PML may include progressive weakness on one side of the body, clumsiness of limbs, vision disturbances, and changes in thinking, memory, and orientation that may result in confusion or personality changes. If PML is suspected, a magnetic resonance imaging (MRI) scan can confirm early stages of the disease. Patients should also get an MRI brain scan prior to starting natalizumab treatment to evaluate pre-existing brain lesions.

Natalizumab may also cause liver damage. Signs of liver injury include yellowing of skin and eyes (jaundice), sudden darkening of urine, fatigue, and nausea and vomiting. Patients should immediately contact their doctors if any of these symptoms develop. If blood tests confirm liver injury, natalizumab should be discontinued.

Mitoxantrone (Novantrone)

Mitoxantrone (Novantrone) was the first drug approved specifically for secondary-progressive MS and progressive-relapsing MS. It is also used to treat worsening relapsing-remitting MS. Mitoxantrone is often used in combination with an interferon beta drug or glatiramer acetate.

Cumulative doses can have toxic effects on the heart, including heart failure, so the drug is only used for a limited period of 2 - 3 years. Patients should have a heart evaluation, including evaluation of left ventricular ejection fraction (LVEF), before starting this drug and before each dose administration. Mitoxantrone can also increase the risk for leukemia.

Side Effects. In addition to risks of heart damage, common side effects of mitoxantrone include nausea, thinning hair, bladder infections, mouth sores, and loss of menstrual periods. Patients may experience a temporary bluish color to their urine or eyes during the first 24 hours after IV infusion.

Fingolimod (Gilenya)

Fingolimod (Gilenya) was the first oral drug approved to treat relapsing forms of MS. [The other two oral drugs are teriflunomide (Aubagio) and dimethyl fumarate (Tecfidera).] Fingolimod is taken once-daily as a pill.

Common Side Effects. Common side effects may include headache, influenza, diarrhea, back pain, cough, and abnormal liver enzymes.

Severe Side Effects. Fingolimod can decrease heart rate (bradycardia, or bradyarrythmia) especially after the first dose. (The doctor should monitor the patient for 6 hours after the first dose to make sure there are no heart problems.) Heart rates usually stabilize within a month after starting fingolimod. Because of these cardiac side effects, patients with certain pre-existing heart conditions or recent history of heart attack or stroke should not use fingolimod.

Other serious side effects include macular edema (fluid accumulation in a part of the eye’s retina), increased risk of serious infections, and shortness of breath. Fingolimod can cause liver problems; patients should have liver tests before starting the drug. This drug may cause birth defects. Women of childbearing age who take fingolimod should use birth control while on the drug.

Teriflunomide (Aubagio)

Teriflunomide (Aubagio) was the second approved oral treatment for relapsing forms of MS. Like fingolimod, teriflunomide is taken as a once-daily pill.

Common Side Effects. Teriflunomide may cause diarrhea, upset stomach, flu-like symptoms, and a burning sensation in skin. Hair thinning and loss may occur.

Severe Side Effects. Teriflunomide can cause serious liver problems and should not be taken by patients with liver disease. The drug can lower white blood cell counts, which increases the risk for infections. Teriflunomide can affect a man’s sperm and it can cause birth defects in pregnant women. Both men and women who take teriflunomide should use contraception while taking this drug.

Dimethyl Fumarate (Tecfidera)

Dimethyl fumarate (Tecfidera) is the newest of the three oral drugs approved for treating relapsing forms of MS. Dimethyl fumarate is taken twice daily as a pill.

Common Side Effects. Like fingolimod and teriflunomide, this drug can cause upset stomach and diarrhea. This drug may also cause skin flushing and stomach pain.

Severe Side Effects. Dimethyl fumarate may lower white blood cell counts although it does not appear to seriously increase the risk for infections. It is uncertain if dimethyl fumarate causes birth defects or can be passed along in breast milk. This drug was approved in 2013, so its side effects may not yet be fully known.

Lifestyle Changes

Living with multiple sclerosis can be a challenging and frustrating experience. Fortunately, there are many different types of lifestyle changes and strategies that can help patients better manage the symptoms and stresses of this disorder.

Rehabilitation Therapies

Patients with MS can benefit from various rehabilitation services to help them cope with physical and emotional symptoms:

  • Physical Therapy. Physical therapists provide professional guidance on exercise programs. They can also advise on how to best use mobility aids (such as canes, crutches, and scooters) and other assistive devices.
  • Occupational Therapy. Occupational therapists help patients learn how to improve their functioning and independence within their home and workplace environments. They can provide professional advice on what sort of adaptive tools, such as grab bars, should be used in the bathroom, bedroom, and kitchen.
  • Vocational Therapy. Vocational therapists provide guidance on how patients can best manage in the workplace.
  • Speech/Language Therapy. Speech and language therapists treat problems with speech and communication. They can also help address problems with swallowing.
  • Psychological Therapies. Psychotherapy can help patients and their families cope with the emotional aspects of living with MS. Some patients may benefit from cognitive-behavioral therapy to help develop techniques for dealing with and overcoming negative thought patterns.

Assistive Devices and Adaptive Tools

In addition to electric scooters and other mobility devices, there are many devices that can make life easier in the home. They include:

  • Kitchen gadgets, such as jar openers, assist with gripping and grabbing. Special kitchen tools, like rocker knives, can make cooking chores easier. Lower countertops and pull-out shelves are also helpful. Reaching devices can help retrieve various objects.
  • Door-knob extenders and key turners are helpful for patients who have trouble turning their wrists.
  • Shower benches, grip bars, and raised toilet seats can make bathrooms safer and easier to use independently.
  • Patients should also make changes in their home environment. Place items within easy reach.  Remove clutter so you can find things easier and remove loose rugs to avoid the risk for falls. Rearrange furniture so you can walk without obstruction. If you get fatigued easily, try placing extra chairs in certain spots so you can take a break while going through your daily routines.

Conserving Energy

Fatigue is very common in multiple sclerosis and it can worsen as the day progresses. It’s important to get sufficient rest and to develop strategies (and priorities) for conserving energy. An occupational or physical therapist can advise you on ways to make walking and daily household tasks less tiring. Assistive devices can be very helpful. If you have problems with sleep, or bladder problems are interfering with your sleep, talk with your doctor about possible medications or other therapies.


Patients with MS should try to engage in a variety of exercises including stretching, muscle strengthening, and range-of-motion. Exercise can help reduce fatigue and relieve muscle spasticity, and it can help your mind and spirit as well as your body. A physical therapist can suggest exercise programs that are best for you, and help set realistic goals. Many patients with MS find water a great environment for exercise. In addition to swimming, there are various types of aquatic exercises that can help improve balance, strength, and stretching.


A healthy diet is very important for keeping your heart, bones, and immune system strong. Eating right will also help control your weight (a concern for many patients with MS). Some dietary suggestions include:

  • Drink about 2 quarts of water a day. Drinking water helps avoid constipation (although it may cause difficulties in patients who also have urge urinary incontinence).
  • Eat a diet rich in fiber, particularly from whole grains (especially bran, oats, or flax), fruits (particularly prunes), and vegetables.
  • Low-fat diets are not proven to have much effect on MS but are, in any case, generally healthy.
  • Omega-3 fatty acids, found in oily fish and fish oil supplements, may possibly help reduce inflammation and improve symptoms. The best results come from eating fish. Supplement forms of omega-3 fatty acids contain the docosahexaenoic (DHA) and eicosapentaenoic (EPA) acids found in fish. If you take fish oil supplements (or any kind of supplement) be sure to let your doctor know in case there is a risk for interaction with your medication.
  • Be skeptical of “special diets” promoted as MS cures. There is no evidence that they work, and the best dietary approach is common sense healthy eating (low fat, high fiber, lots of fruits and vegetables).

Stress Management

It is important to find strategies to deal with the stress of living with a chronic and unpredictable condition. Many patients with MS struggle with feelings of anger, depression, and a sense of loss of control. Some people find that stress can worsen MS symptoms such as fatigue.

Stress management techniques include deep breathing and other relaxation modalities, meditation, biofeedback, music therapy, yoga, tai chi, and massage therapy. Exercise is also an excellent way to reduce stress. Building a strong and positive support network of family and friends can also help you better deal with stress.

Body Temperature Control

Raised body temperature often triggers symptoms of MS. The following measures may help:

  • Stay hydrated. Drink plenty of fluids, but avoid caffeinated beverages. Caffeine acts as a diuretic.
  • Use air conditioners in the summer and keep the home slightly cool in the winter. Misting fans can also help lower air temperature.
  • Exercise in cool water and avoid overheated pools.
  • Cooling vests are very popular with many patients. Newer styles of vests are lightweight and contain special fabrics, chemicals, or gels that help reduce body temperature. There are also special cooling scarves, bandanas, and hats.

Preventing Influenza

MS symptoms worsen during a cold or the flu, probably because of increased immune system activity and fever. Doctors recommend that patients with MS receive a flu shot in the fall. However, patients should not take the nasal spray version of the flu vaccine (FluMist Intranasal). Unlike the flu injection vaccine, which uses an inactivated virus, FluMist contains a live virus. Live virus vaccinations may be harmful for people with MS, especially those who take immune-suppressing drugs.

Herbs and Supplements

Generally, manufacturers of herbal remedies and dietary supplements do not need FDA approval to sell their products. Just like a drug, herbs and supplements can affect the body's chemistry, and therefore have the potential to produce side effects that may be harmful. There have been a number of reported cases of serious and even lethal side effects from herbal products. Patients should check with their doctors before using any herbal remedies or dietary supplements.

The following warnings are of particular importance for people with multiple sclerosis:

  • Antioxidant Vitamins. The MS disease process my be partly due to oxidation. However, no studies have proven the effectiveness of antioxidant vitamins (such as vitamins C and E) for MS. In addition, antioxidants may possibly activate T cells and macrophages (inflammatory components of the immune system) and might theoretically pose some danger to patients. Small studies to date have not found any worsening of the disease from taking vitamin supplements, but patients should be cautious.  
  • Vitamin D. Vitamin D supplements are helpful for people with low levels of vitamin D in their blood. Vitamin D strengthens bone and may help prevent osteoporosis. A recommended daily dosage is 400 – 800 IU. For people with vitamin D deficiency, 1000 IU may be recommended.
  • Gingko. Gingko may cause an increased risk for bleeding when used at high doses. Ginkgo can also interact with high doses of vitamin E, anti-clotting medications, aspirin, and NSAIDs. Randomized trials have failed to show any benefit for MS symptoms.
  • Bee Venom. For years, anecdotal reports have claimed that bee stings relieve some MS symptoms. No studies have confirmed any benefits. Bee venom contains many chemicals, some of which can cause severe and sometimes deadly allergic reactions in some people.
  • Linoleic Acid. Linoleic acid, commonly known as evening primrose oil, is a polyunsaturated fatty acid believed by some people to be helpful because myelin is composed of fatty acids. No study has proven that it is beneficial, but it does not appear to cause any harm.

Resources -- National Institute of Neurological Disorders and Stroke -- American Academy of Neurology -- Multiple Sclerosis Association of America -- National Multiple Sclerosis Society -- Multiple Sclerosis Foundation -- National database of assistive devices and rehabilitation equipment


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Version Info

  • Last reviewed on 9/16/2013
  • Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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