Multiple sclerosis (MS) is a disease that affects the nervous system. In a healthy body, nerves are surrounded by a protective layer of fatty tissue called the myelin sheath. If you have MS, that fatty layer is irreversibly damaged by an unknown cause. This makes it harder for your nerves to transmit impulses between your brain, eyes, and spinal cord, causing a range of symptoms.
Benign multiple sclerosis (MS) is a mild form of MS. In this form, symptoms can completely clear up during remissions and the disease doesn't progress much, even after 15 years. Generally the symptoms affect your sense of sight and touch.