So what is MS?
Multiple sclerosis (MS) is different for everyone. You can get symptoms in many parts of your body.
MS is a neurological condition. That means it affects your nerves. It's caused when your immune system isn’t working properly.
Multiple sclerosis (MS) is a condition that affects your brain and spinal cord. In MS, the coating that protects your nerves (myelin) is damaged, and this causes a range of symptoms.
Once diagnosed, MS stays with you for life, but treatments and specialists can help you to manage the condition and its symptoms.
More than 100,000 people in the UK have MS. Symptoms usually start in your 20s and 30s and it affects almost three times as many women as men. Read the latest statistics on MS in the UK.
We don't know the cause and we haven't yet found a cure, but research is progressing fast.
What happens in MS?
To understand what happens in MS, it's useful to understand how the central nervous system works. A substance called myelin protects the nerve fibres in the central nervous system, which helps messages travel quickly and smoothly between the brain and the rest of the body.
In MS, your immune system, which normally helps to fight off infections, mistakes myelin for a foreign body and attacks it. This damages the myelin and strips it off the nerve fibres, either slightly or completely, leaving scars known as lesions or plaques.
This damage disrupts messages travelling along nerve fibres – they can slow down, become distorted, or not get through at all.
As well as losing the myelin, there can sometimes be damage to the actual nerve fibres too. It's this nerve damage that causes the increase in disability that can occur over time.
The central nervous system links everything your body does, so MS can cause many different types of symptoms.
The specific symptoms that appear depend on which part of your central nervous system has been affected, and the job of the damaged nerve.