The main causes of lip pain are as follows: first, lip mucosal ulcers, ulcers can cause congestion, rupture and erosion of the inner mucosa of the lips, which can lead to severe pain; second, trauma to the lips, the lips are easily traumatized, or bitten by the teeth, the lips are loose tissue, swelling is obvious after trauma, if there is an open wound, you should immediately go to the hospital to disinfect and suture; third, chronic lip inflammation. Lip inflammation causes dry, chapped and flaky lips, which can cause vesicles and secondary bacterial infections in serious cases. Patients with lip inflammation should avoid the stimulation of hot and spicy food and lip biting and licking, apply lip balm to keep the lips moist, and use medication under the guidance of a doctor if the symptoms are severe, but they should not apply drugs containing hormones without permission; fourth, lip allergy, angioneurotic edema caused by allergy, which can make the lips Tightness, swelling and tingling in a short period of time.