Numbness of half of the face may be related to poor posture, or it may be caused by trigeminal nerve compression or injury, acute cerebrovascular disease and other reasons. 1. Poor posture: prolonged facial compression will cause skin ischemia and hypoxia, and the symptoms of half face numbness will appear, and the symptoms will disappear after lifting the compression. 2. Trigeminal nerve compression or injury: facial sensation is controlled by the trigeminal nerve, so the trigeminal nerve compression or injury may appear symptoms of facial numbness, but also may be accompanied by cheeks, upper and lower jaw and tongue obvious severe electric shock-like, needle-like, knife-like or tear-like pain. 3. Acute cerebrovascular disease: common in acute cerebral infarction, cerebral hemorrhage, etc., due to local brain tissue damage, induced sensory dysfunction, may cause half of the face numbness, may also be accompanied by slurred speech, hemiplegia, numbness, weakness and other symptoms. The numbness of half of the face may also be related to other factors, if the symptoms persist, it should be taken seriously, and consult a doctor in time, after a clear diagnosis of the cause of the disease, and be treated under the guidance of the doctor.