Numbness of the right hand and right leg may be brain diseases, cervical spondylosis, spinal cord lesions, etc. 1. Brain diseases: When there is unilateral muscle weakness, unilateral limb numbness and other symptoms, a single brain lesion can be considered, such as acute stroke, brain tumor and other brain diseases. 2. Cervical spondylosis: when the spinal cord disease caused by cervical spondylosis compresses the nerves of the right side of the limbs, it can lead to numbness of the right hand and the right leg of the patient, and the mechanism of this is due to the compression of local blood vessels and nerves by cervical vertebrae, which leads to the reduction of blood in the local area and the swelling, and it needs to be evaluated by cervical spine MRI examination. 3. Spinal cord lesions: Numbness in the right hand and leg can also occur when there are spinal cord lesions, such as myelitis, spinal cord cavernous disease and other demyelinating diseases. There may be other causes of numbness in the right hand and right leg. When the patient has numbness in the right hand and right leg, he/she needs to go to the hospital, and the diagnosis will be determined based on the comprehensive analysis of the patient’s medical history, clinical symptoms, physical examination, and auxiliary examination.