Many people aren't aware they have the disease and often it goes undiagnosed for years, reports CBS News Health Correspondent Dr. Emily Senay on CBS This Morning. Multiple sclerosis occurs when the protective sheath covering the brain's nerves is destroyed. The destruction leads to loss of muscle coordination and a breakdown of motor functions.
Women are twice as susceptible as men and whites are more more at risk than blacks.
In patients for whom the disease is crippling, loss of muscle coordination, impaired vision, and severe nervous attacks occur. Symptoms include muscle weakness, tremors, loss of vision, fatigue and bladder problems. Researchers theorize the disease may arise from a deficiency in the immune system. The exact cause is unknown, but a virus is thought to perhaps cause an autoimmune repsonse in which the body's own tissue is treated like an outside invader. There is no cure for the disease and treatment is limited.