Numbness of the left foot can be caused by cerebrovascular disease, nerve injury, blood circulation disorders, etc. Medications should be administered according to the cause. 1. Cerebrovascular disease: people with cerebral infarction can take aspirin, atorvastatin and other drugs for the treatment of the original disease. At the same time, vitamin B drugs such as methylcobalamin can be taken appropriately to promote the recovery of neurological function and relieve symptoms. 2. Nerve damage: Numbness of the left foot caused by nerve damage in the left foot can take methylcobalamin, vitamin B1 and other drugs to promote the repair of damaged nerves and improve the symptoms of numbness of the foot. 3. Blood circulation disorders: due to unilateral lower limb thrombotic occlusive vasculitis leads to abnormal blood circulation can also lead to the appearance of foot numbness, can take cilostazol, aspirin and other treatments. Unilateral numbness of the limbs do not relieve after activity, or accompanied by other symptoms, should be timely diagnosis and treatment, drugs should be used in accordance with medical advice.