What is MS?
Multiple sclerosis (MS) is a condition where your body’s defense system mistakenly attacks the protective covering of your brain, spinal cord, and optic nerves. This covering is called the myelin sheath. Imagine it like the insulation around an electrical wire. Myelin helps nerve signals travel quickly. When MS damages this insulation, signals slow down or get mixed up. This causes many different symptoms that vary from person to person.
MS is not contagious or a death sentence. But for the nearly 1.8 million people worldwide who have it, it’s a lifelong and unpredictable condition.
Common MS Symptoms
MS symptoms are different for everyone because the damage can happen anywhere in the central nervous system. However, some symptoms are very common and often lead to a diagnosis.
- Vision Problems: Blurry vision, double vision, or loss of vision in one eye (optic neuritis), often with pain.
- Numbness/Tingling: A pins-and-needles feeling or loss of sensation in parts of the body.
- Extreme Tiredness: This isn’t normal tiredness. MS fatigue is severe and doesn’t get better with rest. It’s a very common and difficult symptom.
- Muscle Weakness and Spasms: Weakness in arms or legs, making it hard to move. Muscle stiffness or spasms (spasticity) are also common.
- Balance Issues and Dizziness: Feeling like the room is spinning (vertigo) or being unsteady when walking.
- Bladder and Bowel Problems: Over 80% of people with MS have bladder issues like urgency or frequent urination.
- The “MS Hug”: A strange, tight squeezing feeling around the torso caused by muscle spasms.
- Cognitive Issues: Trouble with memory, clear thinking, or finding the right words.
Other symptoms include pain, depression, and emotional changes. Symptoms can come and go, or slowly worsen over time.
When to See a Doctor
If you have any of these symptoms, especially if they come on suddenly and without cause, you should see a doctor:
- Sudden vision loss or severe double vision.
- Numbness or weakness that spreads, making it hard to walk or use your hands.
- An electric shock feeling down your back when bending your neck (Lhermitte’s sign).
- Any combination of these symptoms lasting more than 24 hours.
Early diagnosis and treatment can help slow the disease.
What Causes MS?
We don’t know the full cause of MS. Scientists believe it’s not just one thing, but a mix of factors.
MS is an autoimmune disease. Your immune cells, meant to fight germs, get confused. They cross into the brain and spinal cord and attack myelin as if it were a threat. This causes swelling and damages the nerve coverings, leaving scars. “Sclerosis” means scarring.
Why do immune cells attack healthy tissue? It’s likely a combination of your genes and environmental factors.
MS Risk Factors
You can’t “catch” MS. Instead, certain factors seem to increase your risk:
- Geography: MS is more common in countries further from the equator (like Canada, northern US, northern Europe). This suggests a link to vitamin D.
- Vitamin D Deficiency: Low vitamin D levels are linked to a higher risk of MS. Vitamin D, the “sunshine vitamin,” helps control the immune system. A 2018 study supported this.
- Genetics: MS isn’t directly inherited. However, if a close family member has it, your risk goes from 0.1% to 2-4%. Many genes may slightly increase risk.
- Infections: The Epstein-Barr virus (EBV), which causes mono, is a strong suspect. Most people with MS have been exposed to EBV. A Harvard study suggested it might be a main trigger.
- Smoking: Smokers are more likely to get MS, and their disease often gets worse faster. Doctors always advise quitting smoking if you have MS.
- Age and Sex: MS usually starts between ages 20 and 40. It affects women two to three times more often than men.
MS Complications
MS can lead to other health problems over time. For example, weak leg muscles can make walking difficult, and some people may need a cane or wheelchair. Bladder problems can cause urinary tract infections. Difficulty swallowing can increase the risk of pneumonia.
Living with MS is also very stressful. Depression is common in people with MS, due to both the emotional burden and physical changes in the brain.
Types of MS
MS affects different people in different ways. Knowing your type helps doctors decide on treatment. The National Multiple Sclerosis Society identifies these main types:
Relapsing-Remitting MS (RRMS)
About 85% of people are first diagnosed with RRMS.
RRMS involves clear attacks (relapses) where new symptoms appear or old ones worsen. These can last days or weeks. Then, symptoms lessen or disappear during remission periods. During remission, the disease doesn’t seem to worsen. While you might feel normal between attacks, damage from each attack can build up.
Secondary-Progressive MS (SPMS)
This type often follows RRMS. After some time, often a decade or more, the disease can change. Relapses and remissions become less clear, and symptoms steadily worsen. Disability slowly increases, whether or not there are obvious flare-ups.
However, newer treatments mean fewer people go from RRMS to SPMS, and if they do, it happens later.
Primary-Progressive MS (PPMS)
Around 15% of people with MS have this type.
PPMS starts differently. There are no distinct relapses and remissions. Instead, symptoms slowly and steadily worsen from the beginning. There might be stable periods, but the overall trend is toward increasing disability. It affects men and women almost equally and usually starts later in life, often in the 40s or 50s.
A very rare type is Clinically Isolated Syndrome (CIS), which is a first episode of MS-like symptoms. It might become full MS or not. But most people’s journey fits into one of the three main types.
Learning about MS helps us predict its course and find better treatments. It’s a long journey, but many people are finding support along the way.