What Is Multiple Sclerosis?

Multiple sclerosis, or MS, is a disease of the central nervous system that causes symptoms throughout the body. The progressive condition causes scar tissue, called lesions, along the nerve fibers in the brain, spinal cord, and optic nerve.
MS can’t be cured, but treatment and prevention of relapses can help reduce symptom severity. Regular MRI scans can help doctors assess disease progression and determine proper medications and lifestyle changes.
Types of Multiple Sclerosis
Scientists have long described different types of MS, the most common being relapsing-remitting MS, primary-progressive MS, and secondary-progressive MS.
Nonetheless, most people with MS are still diagnosed with a particular type of the disease based on their progression of symptoms.
Relapsing-Remitting MS (RRMS)
Times when symptoms worsen are relapses — also known as flares or exacerbations. As a relapse ends, the severity of symptoms diminishes, but a person can be left with new, permanent symptoms. The quiet period between relapses is called remission, which can last for months or years before another relapse occurs.
Secondary-Progressive MS (SPMS)
Relapsing MS (RMS)
Primary-Progressive MS (PPMS)
Progressive-Relapsing MS (PRMS)
Benign MS
Malignant MS
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How Can Someone Identify New or Worsening MS Symptoms?
Signs and Symptoms of Multiple Sclerosis
No two people with MS have the same pattern of symptoms. And symptoms can change or fluctuate in severity over time.
Common Symptoms
- Anxiety
- Bladder and bowel dysfunction
- Depression
- Dizziness
- Fatigue
- Muscle spasticity
- Pain
- Problems with thinking and memory
- Sexual dysfunction
- Vertigo
- Weakness
Uncommon Symptoms
- Breathing problems
- Difficulty moving arms
- Difficulty reading facial expressions
- Diminished fine motor control in the hands
- Headache
- Hearing loss
- Itchy skin or altered sensations
- Lhermitte’s sign
- “MS hug”
- Pseudobulbar affect
- Seizures
- Sensitivity to cold
- Speaking problems
- Swallowing problems
- Tremor
- Trigeminal neuralgia
These symptoms can happen during a relapse, or flare, which occurs because of inflammation of previously existing lesions, new areas of inflammation in the central nervous system, or both.
How Much Do You Know About MS Symptoms?

Causes and Risk Factors of Multiple Sclerosis
The cause of MS is unknown — no one knows what sets off the disease process that leads to MS lesions in the first place. But it is thought that some combination of genetic susceptibility and environmental causes is necessary to trigger the disease.
- Epstein-Barr Virus Some research points to the Epstein-Barr virus as a likely environmental trigger. A recent study of more than 10 million young adults on active duty in the U.S. military found that the risk of MS increased 32-fold after infection with the Epstein-Barr virus, but was unchanged after infection with other viruses.
- Infectious Mononucleosis Earlier research found that having infectious mononucleosis (“mono”), which is most commonly caused by the Epstein-Barr virus, doubled the risk of MS when the infection occurred during childhood and tripled it when the infection occurred during adolescence.
- Low Vitamin D Some other research points to low vitamin D levels as a contributing cause of MS.
- Cigarette smoking This is also known to raise the risk of developing MS.
- Childhood obesity This also appears to raise the risk.
How Is Multiple Sclerosis Diagnosed?
- A neurological evaluation of physical movement and coordination, vision, balance, and mental functioning
- Blood tests to rule out other conditions
- Magnetic resonance imaging (MRI) scans to detect brain lesions typical of MS
- Lumbar puncture (spinal tap) to obtain cerebrospinal fluid, which may contain substances more likely to be found in people with MS
Which MS symptom has the biggest impact on your daily life?
Treatment and Medication Options for Multiple Sclerosis
In many cases, MS symptoms can be treated. Sometimes, treatment involves taking medication. Other times, it involves getting a form of rehabilitation, such as physical therapy, occupational therapy, speech therapy, or cognitive therapy. People with MS who are depressed can often be helped by the same types of antidepressants, psychotherapy, and lifestyle changes that are beneficial for depressed people who don’t have MS.
Even when treatment can’t relieve an MS symptom entirely, it can often reduce its severity.
Disease-Modifying Therapy Options
Disease-modifying medication can reduce the number and severity of relapses in those who have them. It can also slow disease progression. However, these drugs don’t treat MS symptoms, nor are they effective at shortening an MS relapse that’s in progress.
Other Treatments for MS Symptoms
- Analgesics, such as NSAIDs (like ibuprofen) or acetaminophen (Tylenol), for pain
- Antispasmodics, such as baclofen (Fleqsuvy), to ease muscle spasms
- Muscle relaxants, such as dalfampridine (Ampyra) and tizanidine (Zanaflex), to improve walking ability
- Physical therapy to deal with fatigue, weakness, pain, and spasticity. A physical therapist can prescribe exercises, stretches, and other ways of doing tasks to preserve energy.
- Occupational therapy to find easier or alternative ways to achieve daily tasks, including use of assistive devices and energy conservation techniques
- Speech-language therapy to address trouble with speaking or swallowing
- Cognitive rehabilitation for help with memory and thinking-related tasks
- Psychotherapy for help with depression, anxiety, grief, or distress related to living with chronic conditions
- Lifestyle changes like meditation and exercise to improve function and quality of life
Disparities and Inequities in Multiple Sclerosis
It’s unknown exactly how common MS is among minority groups, such as Black Americans and Hispanics. That's partly because researchers have only just begun to investigate this question. It's also partly because the complex causes of MS mean that the incidence of the disease can vary from one study population to another.
Although evidence is limited, studies have generally suggested that the MS treatments that work for white Americans work for Black Americans with MS, too. According to the National MS Society, Black Americans and people who belong to other ethnic minority groups should check out several MS research initiatives in the U.S. for help with treatment and diagnosis.
Anyone, of any race or ethnicity, with symptoms that suggest MS should seek medical care for diagnosis and appropriate treatment.
Lifestyle Changes and Prevention of Multiple Sclerosis
As of yet, there’s no surefire way to prevent multiple sclerosis, in large part because the cause of the disease is not yet fully understood. But some healthy habits can reduce an individual’s risk of MS.
Get Enough Vitamin D
Increasing vitamin D levels does not guarantee MS prevention, but there’s no harm in doing so, as long as you stay within the safe limits of both sun exposure and vitamin D supplementation.
Quit Smoking
Maintain a Healthy Weight
How Long Does Multiple Sclerosis Last?
Prognosis of MS
Although MS can sometimes be a debilitating disease, it’s rarely fatal, and the majority of people who have it don't become severely disabled. Many people with MS maintain their mobility, largely with the help of disease-modifying drugs, plus the use of assistive devices, such as canes or crutches; some also use scooters or motorized wheelchairs to cover long distances.
- Are female
- Were younger than 40 when diagnosed
- Have infrequent attacks
- Make a complete recovery from relapses
- Have long intervals between relapses
- Have symptoms that are mostly sensory in nature
- Aspiration pneumonia
- Respiratory infection
- Respiratory disease
- Urinary tract infection
- Other infections, including sepsis
- Skin disease, typically pressure ulcers
Of course, people with MS also die from the same systemic illnesses that kill people in the general population, such as heart disease and cancer, underscoring the importance of maintaining the type of healthy lifestyle habits that can lower the risk of these diseases.
Complications of Multiple Sclerosis
Beyond the general side effects of MS, some additional complications can occur with the condition, including:
Urinary Tract Infections
Pneumonia
Physical Trauma From Falling
While not all falls can be prevented, many can, through a range of strategies to build leg strength, improve balance, fall-proof your home, and address potential causes of dizziness.
Pressure Sores
Depression
The good news: No matter the underlying cause, depression in people with MS can be treated with psychotherapy, medication, or a combination of the two.
Conditions Related to Multiple Sclerosis
Some medical conditions occur at a greater frequency in people with MS, although in many cases, the link between diseases is unclear. These conditions include:
- Headache and migraine
- Fibromyalgia A condition that causes widespread pain and weakness
- Epilepsy Seizures can occur with both epilepsy and MS, occurring in about 2 to 5 percent of MS patients
The Takeaway
- Multiple sclerosis, MS, is a progressive condition that affects the nerve fibers of the brain, spinal cord, and optic nerve.
- Deterioration of the myelin sheath (the protective covering of nerve fibers) and nerves themselves leads to scar tissue called lesions, which can cause a variety of neurological and systemic side effects.
- The cause of MS is largely unknown; however, factors like genetics, underlying viruses and infections, smoking, and childhood obesity may play roles in its development.
- Treatment for MS will depend on the type and severity of your symptoms. Most types of MS can be treated with disease-modifying drugs, steroids, and a combination of therapies and lifestyle changes to reduce pain and improve mobility.
FAQ
MS affects each person’s body differently, depending on where it causes lesions or nerve damage, in the brain, spinal cord, and optic nerve. Most people with MS have fatigue. Many have balance difficulties, numbness, muscle spasticity, and bladder problems. Some people have thinking and memory problems because of MS.
Resources We Trust
- Mayo Clinic: Multiple Sclerosis
- Cleveland Clinic: Fatigue in the Context of MS
- Multiple Sclerosis Association of America: Multiple Sclerosis Symptoms
- National Multiple Sclerosis Society: Treating MS
- World Health Organization: Multiple Sclerosis
- Giovannoni G et al. Smouldering Multiple Sclerosis: The ‘Real MS’. Therapeutic Advances in Neurological Disorders. January 25, 2022.
- Omar I et al. Navigating Multiple Sclerosis: From Clinical Categories to Clinical Management. Brain Disorders. June 2025.
- Mey Gabrielle et al. Neurodegeneration in Multiple Sclerosis. WIREs Mechanisms of Disease. August 10, 2022.
- Relapsing-Remitting Multiple Sclerosis (RRMS). National Multiple Sclerosis Society.
- Ask the Doctors. Most People With MS Have Relapsing-Remitting Type. UCLA Health. November 29, 2021.
- Secondary Progressive Multiple Sclerosis (SPMS). National Multiple Sclerosis Society.
- Mayo Clinic Staff. Multiple Sclerosis. Mayo Clinic. November 1, 2024.
- Clinically Isolated Syndrome. National Multiple Sclerosis Society.
- Types of MS. National Multiple Sclerosis Society.
- Progressive-Relapsing MS (PRMS). Cedars Sinai.
- Benign MS. MS Society.
- Program Operations Management System (POMS). Social Security. September 25, 2025.
- Vision Disorders and Multiple Sclerosis. National Society of Multiple Sclerosis.
- Brandis M. Understanding the Rarer Symptoms of MS. MS Focus Magazine. January 2024.
- De Milto L. 6 Less-Common Symptoms of MS. National Multiple Sclerosis Society. July 30, 2024.
- MS Hug. MS Society. October 1, 2025.
- Bjornevik K et al. Longitudinal Analysis Reveals High Prevalence of Epstein-Barr Virus Associated with Multiple Sclerosis. Science. January 13, 2022.
- Xu Y et al. Association of Infectious Mononucleosis in Childhood and Adolescence With Risk for a Subsequent Multiple Sclerosis Diagnosis Among Siblings. JAMA Network Open. October 11, 2021.
- Balasooriya N et al. The Association Between Vitamin D Deficiency and Multiple Sclerosis: An Updated Systematic Review and Meta-Analysis. Multiple Sclerosis and Related Disorders. October 2024.
- Polick C et al. Addressing Smoking in Persons With Multiple Sclerosis: State of the Science and Need for a Targeted Intervention. Nicotine & Tobacco Research. August 25, 2023.
- Schreiner T et al. Obesity and Multiple Sclerosis—A Multifaceted Association. Journal of Clinical Medicine. June 18, 2021.
- Mokhtari S et al. Demographic and Clinical Characteristics of Familial and Sporadic Multiple Sclerosis Patients. International Journal of Preventive Medicine. June 22, 2023.
- Berger L. Is Multiple Sclerosis Hereditary? 5 Factors That Matter. MyMSTeam. January 2, 2026.
- Mayo Clinic Staff. Multiple Sclerosis. Mayo Clinic. November 1, 2024.
- 2024 McDonald Diagnostic Criteria. National Multiple Sclerosis Society.
- Disease-Modifying Therapies. National Multiple Sclerosis Society.
- Ocrelizumab (Ocrevus). MS Society. October 1, 2025.
- Highlights of Prescribing Information. U.S. Food and Drug Administration. September 2024.
- Emerging Treatments for Multiple Sclerosis. Mayo Clinic. July 3, 2024.
- Multiple Sclerosis (MS). Cleveland Clinic. January 25, 2024.
- Medications for Acute Exacerbations. National Multiple Sclerosis Society.
- Sotiropoulos M et al. Relapse Recovery in Multiple Sclerosis: Effect of Treatment and Contribution to Long-Term Disability. Multiple Sclerosis Journal - Experimental, Translational and Clinical. May 28, 2021.
- Brayo P et al. Multiple Sclerosis in the Black Population of the United States. Practical Neurology. February 1, 2021.
- Chang G et al. Association Between Sun Exposure and Risk of Relapse in Pediatric-Onset Multiple Sclerosis. Neurology Neuroimmunology & Neuroinflammation. February 12, 2025.
- Shaheen H et al. Does Vitamin D Deficiency Predict Early Conversion of Clinically Isolated Syndrome? A Preliminary Egyptian Study. International Journal of Neuroscience. March 15, 2018.
- Smoking and MS. MS Society.
- Hagman E et al. Pediatric Obesity and the Risk of Multiple Sclerosis: A Nationwide Prospective Cohort Study. International Journal of Obesity (London). June 2025.
- Kuutti K et al. Mortality and Causes of Death for People with Multiple Sclerosis: A Finnish Nationwide Register Study. Journal of Neurology. May 2, 2025.
- Relapsing-Remitting MS (RRMS). MS Society.
- Prognosis. MS Trust UK.
- Harding K et al. Multiple Cause of Death Analysis in Multiple Sclerosis. Neurology. February 2020.
- Bladder Dysfunction in Multiple Sclerosis. National Multiple Sclerosis Society.
- Mayo Clinic Staff. Urinary Tract Infection (UTI). Mayo Clinic. September 26, 2025.
- Alderton M. Tips for Handling Dysphagia. National Multiple Sclerosis Society. September 21, 2023.
- Aspiration Pneumonia. Cleveland Clinic. December 6, 2024.
- Falls & Fall Prevention in Multiple Sclerosis. Cleveland Clinic Neurological Institute.
- Pressure Ulcers. MS Society.
- Multiple Sclerosis (MS). National Institute of Neurological Disorders and Stroke. December 17, 2025.
- Interferon Beta-1b Injection. Medline Plus. October 15, 2023.
- Seizures and Multiple Sclerosis. National Multiple Sclerosis Society.

Jessica Baity, MD
Medical Reviewer
Jessica Baity, MD, is a board-certified neurologist practicing in southern Louisiana. She cares for a variety of patients in all fields of neurology, including epilepsy, headache, dementia, movement disorders, multiple sclerosis, and stroke.
She received a bachelor's degree in international studies and history from the University of Miami and a master's in international relations from American University. She graduated from the Louisiana State University School of Medicine, where she also did her internship in internal medicine and her residency in neurology.
Prior to practicing medicine, she worked in international relations and owned a foreign language instruction and translation company.

Ingrid Strauch
Author
Ingrid Strauch joined the Everyday Health editorial team in May 2015 and oversees the coverage of multiple sclerosis, migraine, macular degeneration, diabetic retinopathy, other neurological and ophthalmological diseases, and inflammatory arthritis. She is inspired by Everyday Health’s commitment to telling not just the facts about medical conditions, but also the personal stories of people living with them. She was previously the editor of Diabetes Self-Management and Arthritis Self-Management magazines.
Strauch has a bachelor’s degree in English composition and French from Beloit College in Wisconsin. In her free time, she is a literal trailblazer for Harriman State Park and leads small group hikes in the New York area.