what is multiple sclerosis

Multiple sclerosis (MS) is a chronic disease of the central nervous system, which includes the brain, spinal cord, and optic nerves. It is an autoimmune disorder in which the body's immune system attacks the myelin, the protective covering of the nerve cells. This attack on the myelin results in the formation of scar tissue, also known as sclerosis, which can disrupt the transmission of signals within the nervous system. The exact cause of MS is not known, but it is thought to involve a combination of genetic, environmental, and infectious factors. MS can cause a wide range of symptoms, including vision problems, muscle weakness, difficulty with coordination and balance, and cognitive impairment. The disease is unpredictable and affects each person differently. It is most commonly diagnosed in young adults, typically between the ages of 20 and 40, and it is more common in women than in men