Multiple sclerosis
Multiple sclerosis is a condition characterized by areas of damage on the brain and spinal cord. These lesions are associated with the destruction of the covering that protects nerves and promotes the efficient transmission of nerve impulses and damage to nerve cells . Multiple sclerosis is considered an autoimmune disorder; autoimmune disorders occur when the immune system malfunctions and attacks the body's own tissues and organs, in this case, tissues of the nervous system. Multiple sclerosis usually begins in early adulthood, between ages 20 and 40. The symptoms vary widely, and affected individuals can experience one or more effects of nervous system damage. Multiple sclerosis often causes sensory disturbances in the limbs, including a prickling or tingling sensation (paresthesia), numbness, pain, and itching. Some people experience Lhermitte sign, which is an electrical shock-like sensation that runs down the back and into the limbs. This sensation usually occur...