For the appearance of the left side of the body pain, most often seen in the cranial part of the disease, such as cerebral infarction, cerebral hemorrhage, brain tumors, craniocerebral trauma, resulting in the right side of the cranial part of the brain injury, will cause the left side of the body with obvious pain, and also accompanied by numbness, limited mobility. Therefore, if the patient has pain on the left side of the body, it is necessary to have an MRI examination of the craniocerebral region, mainly to see what causes the pain caused by nerve compression, and according to the results of the examination, whether conservative or surgical treatment should be adopted.