Multiple sclerosis is a demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged. This damage disrupts the ability of parts of the nervous system to transmit signals resulting in a range of signs and symptoms including physical, mental, and sometimes psychiatric problems. Specific symptoms can include double vision, blindness in one eye, muscle weakness and trouble with sensation or coordination. MS takes several forms with new symptoms either occurring in isolated attacks or building up over time. Between attacks, symptoms may disappear completely; however, permanent neurological problems often remain, especially with the advancement of the disease.