Multiple sclerosis affects the brain and spinal cord — the central nervous
system. Specifically, it damages myelin, the protective coating around
nerve cells that helps nerves send messages quickly. Damaged myelin means
messages between brain and body slow down or get blocked, and that is what
produces the symptoms.
The insulation analogy is worth holding, because it explains the disease's
most confusing feature: MS symptoms depend on which nerves are affected,
so two people with the same diagnosis can have almost nothing in common.
Five named patterns
| Type | How it behaves |
|---|---|
| Relapsing-remitting | The most common. Flare-ups of new or worsening symptoms, then periods of recovery with few or none |
| Secondary-progressive | What some relapsing-remitting cases become: symptoms slowly worsen, with fewer or no recovery periods |
| Primary-progressive | Symptoms worsen from the start, without clear relapses or recoveries |
| Clinically isolated syndrome | A single episode of MS-like symptoms lasting at least 24 hours. May be an early sign — not everyone goes on to develop MS |
| Radiologically isolated syndrome | MS-like changes visible on an MRI in someone with no symptoms at all. Some develop MS; some do not |
The last two exist because MRI can now see the damage before the person feels
anything, which creates a category of people who have the picture of a disease
without the disease.
What causes it
Nobody knows exactly. Many believe it is autoimmune — the immune system
mistakenly attacking healthy cells, here the myelin. Several factors appear to
combine:
- A previous Epstein-Barr virus infection — the most common cause of
mononucleosis - Environment — smoking, little sun exposure, low vitamin D
- Genes — certain genes raise risk, and **not everyone carrying them gets
MS** - Family history — a close relative diagnosed with it
- Sex — MS is two to three times more common in women
- Age — it most often begins between 20 and 40
Symptoms
Blurry or double vision, or eye pain (often from optic neuritis). Trouble with
bladder control. Muscle weakness. Muscle stiffness or spasms. Trouble with
coordination, walking or balance. Numbness, tingling or pins and needles.
Thinking or memory problems. Fatigue. Dizziness or vertigo. Mood changes.
Some people have mild symptoms; others have more serious problems.
Diagnosis without a single test
There is no specific test for MS. A provider assembles a diagnosis from:
- A review of health history and symptoms
- A physical and neurological exam — reflexes, strength, senses
- An MRI looking for damage in the brain and spinal cord
- Blood tests to rule out other conditions
- A lumbar puncture, checking the fluid around brain and spinal cord for
signs of MS
Treatment
There is no cure, and treatment manages symptoms and slows the disease:
- Disease-modifying medicines — pills, injections or infusions, slowing MS
and reducing relapses - Medicines for individual symptoms, such as stiffness or pain
- Physical and occupational therapy for movement, strength and daily
activities
Living with MS affects how you feel emotionally. What helps: reducing stress,
connecting with supportive people, eating well, and staying as active as you
comfortably can.
*Source: National Institute of Neurological Disorders and Stroke, via
MedlinePlus.*
Licence: CC0 1.0 (public domain) · Adapted from medlineplus.gov
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