The term 'sclerosis' is a general medical term referring to the hardening or depositing of extra tissue, usually as part of an inflammation process. Some of the best known types of sclerosis include multiple sclerosis
, systemic sclerosis.
The cause of multiple sclerosis is unknown. It's considered an autoimmune disease in which the body's immune system attacks its own tissues. In the case of ms, this immune system malfunction destroys the fatty substance that coats and protects nerve fibers in the brain and spinal cord.