As of 2015, the cause of multiple sclerosis is unknown, but vitamin D deficiency has been linked to the development and worsening of multiple sclerosis symptoms, according to Mayo Clinic. Multiple sclerosis is an auto-immune disease, so vitamin D might be involved because it strengthens the immune system.
Multiple sclerosis symptoms occur when the immune system destroys myelin, the protective covering of the nerve fibers. Symptoms of the disease include numbness or weakness in the limbs, double vision, lack of coordination, slurred speech and fatigue, according to Mayo Clinic. The type and location of symptoms vary depending on the location of the damaged nerve fibers.
People who live in temperate climates are at increased risk of developing multiple sclerosis. Women, Caucasians and smokers are also have a higher risk of developing the disease. Certain viruses and autoimmune diseases can also cause multiple sclerosis. A person with a family history of the disease has an increased risk for developing multiple sclerosis, states Mayo Clinic.
No known treatment has been found for multiple sclerosis, but the disease can be managed with medications, muscle relaxants and physical therapy. Complications related to multiple sclerosis include paralysis, bladder and bowel problems, and epilepsy, according to Mayo Clinic.