Multiple sclerosis, or MS, is a long-lasting disease that can affect your brain, spinal cord, and the optic nerves in your eyes. It can cause problems with vision, balance, muscle control, and other basic body functions.
The effects are often different for everyone who has the disease. Some people have mild symptoms and don’t need treatment. Others will have trouble getting around and doing daily tasks.
MS happens when your immune system attacks a fatty material called myelin, which wraps around your nerve fibers to protect them. Without this outer shell, your nerves become damaged. Scar tissue may form.
The damage means your brain can’t send signals through your body correctly. Your nerves also don’t work as they should to help you move and feel.