The causes of Multiple Sclerosis are unknown, however there are many things that increase the likelihood of the disease; certain genes, infections and lifestyle factors such as smoking may raise the risk. It is thought to be caused by a virus and/or gene defects. Some studies have shown that environmental factors, such as colder climates may also play a part. Those who have family history with the condition are also more likely to develop MS. It is believed to be an autoimmune disease, in which the body's immune system produces an abnormal response, attacking its own cells and tissues. In MS, the myelin, a fatty substance that surrounds, protects and insulates axons, is destroyed. This causes the electrical signals that travel along the nerve
