Multiple sclerosis is a chronic disease where the body's immune system attacks the protective sheaths that cover the nerve fibres, leading to inflammation.
The body attempts to repair the damaged nerve fibres but the condition may lead to the irreversible deterioration of the nerves.
There is no cure for MS but it can be treated with drugs that manage symptoms, reduce inflammation and prevent attacks.
These drugs, however, often come with their own side-effects; those that suppress the immune system, for example, may make an individual more susceptible to respiratory infections.
Others used to prevent attacks may result in short-term fever, fatigue and body pain. Long-term side-effects, such as liver damage, are also possible.
The cause of MS is unknown but there are a number of theories that link it to genetics, viral infections and other environmental factors. Women are twice as likely to get MS as men, and the disease mostly affects individuals between the ages of 20 and 40.
Symptoms of MS include loss of vision, weakness, tingling or numbness in the limbs and fatigue.
* Manal Ismail