Multiple sclerosis (MS) is an unpredictable disease that affects more than 1 million people in the United States. The disease interrupts the communication between the brain and the body and causes muscle weakness, fatigue and balance problems. MS often causes distinct attacks, where symptoms get worse and then subside, which adds to the unpredictability for those living with this brain disease.
MS is a chronic disease of the central nervous system, which includes the brain, spinal cord, and optic nerves. MS can cause unpredictable attacks. It is believed to be an autoimmune disease, in which the body’s immune system attacks its own tissues.
In the case of MS, the immune system causes inflammation that attacks myelin, the protective coating that surrounds nerve cells, and can cause damage to the nerve itself. This disrupts the communication between the brain and other parts of the body.

People living with MS in the U.S.
New cases diagnosed each year
About 1 million people in the U.S. over the age of 18 live with MS, and 10,000 new cases are diagnosed every year.
The cause of MS is unknown, but it’s believed abnormalities in the immune system as well as environmental and genetic factors could contribute to the risk of developing the disease. Two to three times more women are diagnosed with MS than men, suggesting hormones may play a part in risk. While MS is not an inherited disease, studies of families and identical twins show that some genetic risk may be inherited.
More cases of MS occur in areas farther from the equator, which points to potential environmental factors, such as vitamin D levels. Smoking and obesity may also increase the risk of developing MS.
Symptoms of MS can range from mild to disabling, and symptoms usually begin between age 20 and 40 with blurred or double vision. Many people with MS also experience muscle weakness in their limbs, tingling or numbness, fatigue, and difficulty with coordination and balance, all of which can cause issues with walking and standing.
As the disease progresses, people with MS may develop muscle stiffness, dizziness, pain, speech problems, cognitive impairments, and urinary problems. Less common symptoms include tremors, blindness, and paralysis. Two-thirds of people with MS continue to be able to walk, though they may need help from a device such as a cane for stability or a wheelchair due to fatigue or balance issues.
People with MS may experience relapses, or times when their symptoms flare up or new symptoms start, as well as periods of remission, times when symptoms are more mild. As the disease progresses, they may no longer have times of remission. A small percentage, about 15% of people with MS, do not experience any periods of remission but rather a more slow-and-steady progression of the disease from the onset.
Diagnosis is typically determined by magnetic resonance imaging (MRI), lumbar puncture (spinal tap) and/or electrical tests. Doctors look for damage in at least two different areas of the central nervous system that have occurred at different times. They will also typically do blood tests to rule out other diseases.
There is no cure for MS, but there are many treatment options to prevent relapses and further damage to the central nervous system. These treatments include as many as 16 drugs approved by the Food and Drug Administration.
There are also therapies for treating MS relapses, including corticosteroids, which reduce nerve inflammation, and plasma exchange, which involves removing the liquid part of the blood, mixing it with a protein and putting it back. Plasma exchange is best for those with new, severe symptoms that don’t respond to steroids.
MS can also be managed with lifestyle changes and symptom management to improve quality of life. New research on diet, exercise and general wellness have shown benefits for people with MS.
There is much that is still unknown about multiple sclerosis. Research can help us better understand what causes MS, how to prevent relapses of the disease, and how to develop new treatment options to not only stop nerve damage but also repair it.
Cure One, Cure Many Awards
There are over 600 known brain diseases, and neuroinflammation plays a role in nearly all of them. In 2026, the American Brain Foundation awarded four Cure One, Cure Many Awards to better understand neuroinflammation’s role in brain disease.
David Rowitch, MD, PhD, and his team based at Cedars-Sinai Medical Center, in Los Angeles, California has been awarded a $2 million Breakthrough Award in neuroinflammation.
Dr. Rowitch and his team will study neuroinflammation and its role in multiple sclerosis, particularly regarding neurons that express the genetic marker CUX2. They will identify pathways for clinical intervention and develop approaches to enhance DNA repair after damage from neuroinflammation.
Dr. Rowitch will work with teams led by Stephen Fancy, PhD, DVM, at the University of California, San Francisco and Gabriel Balmus, PhD, at the University of Cambridge.
Mariko Bennett, MD, PhD, and her team based at Children’s Hospital of Philadelphia in Pennsylvania has been awarded a $500,0000 Catalyst Award to study neuroinflammation. Dr. Bennett and her team will coordinate three different laboratories to study the neuroimmune mechanism of how microglia—the brain’s immune cells, which trigger neuroinflammation—transition into an early form called ISGMs (interferon-stimulated gene-expressing microglia). This could lead to new therapies that replace and engineer microglia to treat potentially hundreds of brain diseases.
Dr. Bennett will also work with teams led by Michael Haney, PhD, and Frederick “Chris” Bennett, MD, at the University of Pennsylvania.
This research is funded in collaboration with the National Multiple Sclerosis Society, Gates Ventures, the NFLPA, Genentech, and the WoodNext Foundation.
Next Generation Research Grants
Mark Milner, PhD, is studying a specific kind of brain immune cell called disease-associated microglia (DAM), which are sometimes helpful and sometimes harmful. He will work to determine if genetically blocking these cells from forming later in the progression of MS could help the brain repair damaged connections and better heal itself. This research is funded by the Herbert R. Mayer and Jeanne C. Mayer Foundation.
Learn more about research funded by American Brain Foundation donors >
New to research? Read our guide, How to Read a Research Study, to learn some tips for reading scientific publications and interpreting results.
Improving Multiple Sclerosis Treatment
Neuroinflammation and Multiple Sclerosis
Managing Parkinson’s Disease and Multiple Sclerosis
Stephen L. Hauser, MD: Career-Long Dedication Leads to Breakthrough Research in Multiple Sclerosis
Research in Multiple Sclerosis: What’s Giving Us Hope?
Restoring Impaired Vision for Patients with MS

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