The numbness of the right lip and the right tongue may be related to cerebral infarction, facial neuritis, food poisoning and so on. 1. Acute cerebral infarction: because when the patient has cerebellar infarction, it will cause blood circulation obstruction due to narrowing or blockage of cerebral blood vessels. When it presses on the nerves, it may cause numbness of the right side of the tongue and lips. 2. Facial neuritis: Since the facial nerve is a mixed nerve, the main sensation is the taste sensation that innervates the front 2/3 of the tongue. If the facial nerve is injured, the right side of the tongue may become numb, the sense of taste may be reduced, and in some cases, numbness of the mouth may occur. 3. Food poisoning: If the patient consumes eggs or medicines and foods containing lead and mercury for a long time, it is easy to cause poisoning, which is manifested by nerve injury and numbness of the right side of the mouth and tongue. Appears when the right side of the lips and right tongue numbness. It is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.