Multiple sclerosis is an autoimmune disease that occurs in the central nervous system and is most commonly seen in young and middle-aged women between the ages of 20 and 40. However, in recent years, it is not uncommon to see elderly patients in their 60s or even 70s. Multiple sclerosis is a chronic disease with a high relapse rate and a high disability rate, often with remission relapses and a stepwise deterioration. Patients often feel sudden eye pain, deep orbital pain, increased pain when turning or touching the eye, followed by vision loss, and in severe cases, blindness soon, and in some cases, visual field defects. If there is a lesion in the spinal cord, the patient will experience numbness and weakness in the limbs, a tight band-like sensation in the chest and abdomen, and bowel and urinary disorders. If there is a lesion in the brainstem, there is double vision, dizziness, facial pain or numbness, choking on water, and swallowing disorder. If there is a lesion in the cerebellum, there will be unstable walking and poor coordination of small movements; when the deep white matter of the brain is involved, there will be emotional disturbances, and in a few cases, there will be convulsions when the cortex is affected.