Multiple sclerosis, sometimes called muscular sclerosis, refers to a disorder of the immune system wherein healthy body tissues, specifically the myelin coating that protects the nerves, are attacked by an erroneous immune response. Common symptoms that particularly affect the muscles include impaired balance, muscular cramps and difficulty in arm or leg movement, notes the United States National Institutes of Health (NIH).
The deterioration of the myelin sheath results in the disruption of the normal flow of communication between the brain and the spinal cord. Since multiple sclerosis can develop in any part of the central nervous system, manifestations of this disease can occur in multiple areas of the body.
Other known symptoms of multiple sclerosis include trouble with walking, difficulty in making coordinated movements, trembling in the limbs and loss of muscular strength. Aside from the muscles, multiple sclerosis can also cause problems with bowel and bladder movement, vision and sexual activities, states the NIH.