Multiple Sclerosis is a long-lasting, potentially disabling disease that damages the nerves in the brain and spinal cord (central nervous system). The nerve fibers in the human body have a protective fatty tissue wrapped around it (called myelin). In MS, the immune system attacks this tissue damaging the nerves. This damage stops the brain from sending out signals to other parts of the body in the manner it should. And over time, the disease can cause the nerve themselves to deteriorate or become permanently damaged.
MS is most commonly diagnosed in people in their 20s and 30s, although it can develop at any age, and it is more common in women than in men.