What's New Multiple Sclerosis Multiple describes the many scattered areas of the brain and spinal cord which are affected.
Sclerosis describes the hardened tissue in the damaged areas of the brain and spinal cord.
MS interferes with the brain s ability to control certain functions like seeing, walking and talking. It can cause muscle spasms, fatigue, numbness, tingling, bladder dysfunction and paralysis. The cause of MS is uncertain. It may be a virus, or an immune reaction, or both. MS can cause strong emotional reactions, such as fear, anger, depression and guilt.