Numbness of the left foot and left hand may be related to prolonged pressure on the left side of the body, and may also be caused by spinal cord cervical spondylosis, cerebrovascular disease and other reasons. 1. Prolonged pressure on the left side of the body: commonly seen in sleeping, if you keep lying on your side for a long time, resulting in prolonged pressure on the left side of the body, resulting in poor blood circulation, which may cause numbness of the left foot and left hand. 2. Spinal cord cervical spondylosis: especially in patients with cervical spondylotic hyperplasia or cervical disc herniation, cervical spinal cord injury and damage to the lateral sensory pathway may cause numbness in the left foot and left hand, and may be accompanied by neck and shoulder pain, dizziness and other symptoms. 3. Cerebrovascular disease: commonly seen in cerebral infarction, cerebral hemorrhage and other diseases, due to local ischemia or hemorrhage of brain tissue, resulting in damage to the central nervous system, causing cerebral dysfunction, there may be numbness in the left foot and left hand, which may be accompanied by swallowing difficulties, speech disadvantage and other manifestations. Left foot and left hand numbness, may also be related to other factors, if the symptoms continue to get no better, should consult a doctor in time to confirm the diagnosis of the causative factors, to give targeted treatment.