Lip numbness and lip allergy, cerebrovascular disease and oral and maxillofacial inflammation tumor and so on have a relationship. 1. Lip allergy: contact with certain items or eat certain foods, lip allergy, lip swelling, numbness, itching sensation can occur, you can use loratadine and other drugs anti-allergy treatment. 2. Cerebrovascular disease: numbness of the lips, accompanied by facial paralysis on one side of the face, the sudden emergence of speech, need to be vigilant about cerebrovascular lesions, bleeding in the brain to repair a blockage, compression of nerves caused by the need for urgent cardiovascular and cerebrovascular consultation. 3. Oral and facial inflammation tumor: oral and maxillofacial infection, stimulation of the facial nerve, or tumor compression of the nerve, numbness of the lips, need to go to the stomatology department for examination. Numbness of the lips, must promptly seek medical attention, under the guidance of the doctor standardized examination and treatment, to avoid delaying the condition.