what disease is multiple sclerosis

Multiple sclerosis (MS) is a long-lasting (chronic) autoimmune and neurological disease that affects the central nervous system (the brain, spinal cord, and optic nerves).¹²³

What Happens in the Body

• Immune Attack: Your immune system mistakenly attacks healthy tissue instead of protecting it.¹²
• Demyelination: It targets and damages myelin, the protective fatty sheath that covers and insulates your nerve fibers (like the plastic coating around an electrical wire).¹²
• Scars (Sclerosis): When myelin is damaged or destroyed, it forms scar tissue known as plaques or lesions ("multiple sclerosis" literally means "multiple scars").¹²³
• Disrupted Signals: This scarring slows down, distorts, or completely blocks electrical signals traveling between your brain and the rest of your body, leading to a wide range of symptoms.¹²³

Key Facts About MS

• Common Symptoms: Vision problems (such as blurred or double vision or optic neuritis), fatigue, numbness or tingling, muscle weakness, stiffness, spasms, and trouble with balance, coordination, or walking.¹²³
• Who It Affects: It is most commonly diagnosed in young adults between the ages of 20 and 40, and it affects two to three times more women than men.¹²
• Types of MS: The most frequent form is relapsing-remitting MS (RRMS), where symptoms flare up (relapses) and are followed by periods of recovery (remissions). Over time, some types can progress into secondary progressive or primary progressive MS.¹²³
• Outlook & Treatment: While there is currently no cure, modern disease-modifying therapies (DMTs), physical rehabilitation, and supportive care can significantly reduce relapses, manage symptoms, and slow down disability.¹²³

Learn more about signs, types, and support resources on the MS Society About MS Page or explore patient guidance via the MS Trust Signs and Symptoms Guide.¹²Are you or someone you know experiencing specific symptoms, or would you like to know more about diagnosis or treatment options?

Multiple sclerosis (MS) is a lifelong autoimmune condition that affects the central nervous system (the brain, spinal cord, and optic nerves). In MS, the immune system mistakenly attacks myelin, the fatty protective sheath that insulates nerve fibres, disrupting the electrical signals travelling between the brain and the rest of the body.¹²³⁴

How MS Affects the Body

Think of myelin like the plastic coating on an electrical wire. When the immune system causes inflammation and damages this coating, nerve messages slow down, get jumbled, or stop completely. Over time, repeated inflammation leaves behind scar tissue (called lesions or plaques) and can permanently damage the underlying nerve fibres.¹²³⁴

Common Symptoms

Because MS can affect different areas of the brain and spinal cord, symptoms vary widely from person to person. According to the NHS, common signs include:¹²

• Fatigue. Extreme tiredness that does not easily improve with rest is one of the most frequent symptoms.
• Vision problems. Blurred vision, double vision, or temporary vision loss in one eye (optic neuritis) often occur.
• Mobility and balance issues. Muscle weakness, stiffness, spasms, and difficulty walking or coordinating movement are common.
• Sensory changes. People often feel numbness or tingling ("pins and needles") in the face, body, arms, or legs.
• Cognitive and emotional shifts. Difficulties with memory, concentration, or mood changes like depression can develop.¹²³⁴⁵

Main Types of MS

Doctors classify MS into types based on how symptoms behave over time:¹

Causes and Risk Factors

The exact trigger for MS is still unknown, though researchers at the National MS Society note that it likely stems from a combination of genetics and environmental factors.¹

• Age and sex. Most people are diagnosed between the ages of 20 and 40, and MS is roughly two to three times more common in women than in men.¹²
• Infections and vitamin D. Past infection with the Epstein-Barr virus (which causes glandular fever), low vitamin D levels, smoking, and living further from the equator are all linked to a higher risk.¹²

Diagnosis and Treatment

There is no single test for MS. A neurologist typically confirms a diagnosis using a combination of physical exams, MRI scans (to spot lesions on the brain or spinal cord), and a lumbar puncture (spinal tap) to check spinal fluid.¹²³

While there is currently no cure for MS, treatments have advanced significantly:¹

• Disease-modifying therapies (DMTs). Medications taken as pills, injections, or infusions calm the immune system to reduce relapses and slow long-term progression.¹²
• Relapse and symptom care. Steroids are often used to shorten acute flare-ups, while physiotherapy, occupational therapy, and targeted medications help manage stiffness, pain, and fatigue.¹²³

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Early warning signs and when to speak with a GP How disease-modifying therapies work to slow progression Daily lifestyle and symptom management strategies

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Multiple sclerosis (MS) is a chronic disease that affects the brain and spinal cord (the central nervous system).

It is an autoimmune condition, meaning the body's immune system mistakenly attacks the protective covering of nerves, called myelin.

What happens in multiple sclerosis?

Myelin acts like insulation around electrical wires. It helps messages travel quickly between the brain and the rest of the body.

In MS:

• The immune system damages the myelin.
• Messages travelling along nerves can become disrupted or slowed down.
• This can affect movement, balance, eyesight and other body functions.

Common symptoms

Symptoms vary from person to person and can include:

• Blurred or reduced vision.
• Numbness or tingling in the arms and legs.
• Muscle weakness.
• Difficulty walking or balancing.
• Extreme tiredness (fatigue).
• Muscle stiffness or spasms.
• Bladder or bowel problems.
• Memory or concentration difficulties.

Is multiple sclerosis serious?

MS can be serious, but it affects everyone differently. Some people have mild symptoms for many years, while others develop more significant disabilities.

Can it be cured?

There is currently no cure for MS, but treatments are available that can:

• Reduce the number of relapses (flare-ups).
• Slow down the progression of the disease.
• Help manage symptoms.
• Improve quality of life.

Is MS life-threatening?

Most people with MS have a near-normal life expectancy. Many continue to work, have families and live independently.

In simple terms: Multiple sclerosis is a disease where the body's immune system mistakenly attacks the protective covering of nerves, making it harder for the brain to communicate with the rest of the body.