Multiple sclerosis

Multiple sclerosis (MS) is an autoimmune disease where the immune system attacks myelin, the insulating cover of nerve cells in the human body, causing damage to one's own central nervous system. It is a type of demyelinating disease, where the nervous system's ability to transmit signals is damaged. Symptoms can be physical, mental, or both, including double vision, vision loss, eye pain, muscle weakness, loss of sensation and coordination.

Wikipedia. CC BY-SA 4.0. Updated Jul 18, 2026.