The causes of right-sided limb weakness may be the following: 1. Acute appearance is considered to be caused by cerebrovascular diseases, such as cerebral hemorrhage, transient ischemic attack, cerebral infarction type of disease, resulting in cerebral nerve function is damaged, and the patient will have right-sided limb weakness, mainly caused by affecting the motor nerves of the patient. 2. Patients with a slow course of the disease, the emergence of the right side of the limb weakness, the symptom of gradual aggravation or accompanied by headache, is considered to be caused by intracranial tumor, intracranial occupational lesions. If the patient has a slow course of the disease, weakness of the right side of the limbs, symptoms of gradual aggravation or accompanied by symptoms of headache, consider intracranial tumors, intracranial space-occupying lesions caused by the head can be clarified through the head CT, head of the MRI. 3, may also be caused by the cervical spinal cord lesions, the patient should be specific to improve the cervical vertebrae of the MRI to determine.