Numbness of the lips and tongue tip is mainly due to the following reasons: First, if the numbness of the lips and tongue tip is of acute onset, for elderly patients with previous risk factors, such as hypertension diabetes obesity, it is necessary to consider the possibility of acute cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage, and at this time it is necessary to go to the hospital for a cranial magnetic resonance examination. Secondly, if the numbness of the lips and tongue is gradually aggravated and is chronic and progressive, ask the patient if there is any change in vision or hearing, and also go to the hospital for an MRI examination to find out if there is any intracranial occupancy, tumor or lesion compressing the linguopharyngeal nerve. Third, the numbness of the lips and tongue, but also ask the patient whether there is long-term exposure to chemicals, such as lead and mercury and other chemicals. If there is long-term exposure to such chemicals, the nerves can be invaded when poisoned, causing numbness of the lips and tongue.