The numbness of the lips and tongue is mainly due to the following reasons: First, the patient should be asked whether there is a history of facial neuritis, because the facial nerve is the innervation of the first 2/3 of the tongue sensation and taste, if there is a history of facial neuritis, the facial nerve can appear after the numbness of the tongue and lips. Second, if an elderly patient with a history of hypertension and diabetes suddenly develops numbness of the lips and tongue, accompanied by choking and coughing and slurring of words, it is necessary to go to the hospital for a cranial magnetic resonance examination to understand whether there is an acute brain stem infarction. Thirdly, if the patient has a long-term diet of dried eggs, it may cause an overdose of lead, causing a numb feeling in the tip of the lips and tongue. Numbness of the lips and tongue is mainly seen in the above three cases, and should be dealt with according to the specific cause of the disease.