Suddenly the mouth is swollen, there are usually the following situations: a. Patients with acute attacks of mouth ulcers, which are accompanied by obvious swelling and pain of the lips, can take watermelon cream tablets by mouth, gargle with light salt water, and reduce the intake of spicy and stimulating foods. Promote faster healing of the ulcer wound, thus reducing the symptoms of swollen lips. Second, allergic patients after eating allergy-prone foods, such as mango, tomato, mangosteen, seafood, will cause an allergic reaction of antigenic antibodies in the body, which will manifest as swelling of the lips. Patients need to temporarily abstain from diet, take oral loratadine, intramuscular promethazine, intravenous dexamethasone and other anti-allergic drugs to reduce their internal allergic allergic reaction. In patients with milder symptoms, the swelling of the lips will slowly subside and be absorbed within 24-48 hours.