Half face numbness is firstly seen in cerebrovascular diseases, especially ischemic cerebrovascular diseases, where the patient has half face numbness, but also ipsilateral limb or contralateral limb numbness, generally check the head CT or confirm the diagnosis according to nuclear magnetic examination, for half face numbness caused by cerebrovascular diseases, it can also be accompanied by other neurological deficit symptoms. If the above symptoms occur, it is recommended to check the head MRI and give the patient symptomatic treatment such as anti-platelet aggregation and improving circulation. Secondly, numbness of the half of the face is also seen in peripheral facial neuritis. Most of the patients have numbness of the half of the face after catching a cold or wind, and after about 2-3 days the patient has drooping eyelids, inability to puff the cheeks, shallow nasolabial folds, etc. Some patients may have pressure pain behind the ear, and it is recommended to give treatment to reduce neuroedema during the acute stage, and at the same time to improve microcirculation and promote recovery of nerve function.