There are many clinical causes of right-sided limb numbness, but the most common ones are the following: 1. Patients with brain hemorrhage, cerebral infarction or brain tumor may experience numbness in the right limb. 2. Cervical spondylosis. When the nerve roots of the spinal cord are compressed, there will also be numbness on one side of the patient’s limbs. Therefore, there are many causes, and the specific causes need to be clarified according to the combination of physical examination and auxiliary examinations, so as to determine the active treatment plan. Ancillary tests such as cranial CT, MRI, cervical CT, and cervical MRI are required.