The common causes of swollen lips are mainly the following: a. Allergic patients will have allergic reactions when eating seafood, mangoes and other foods, which can be manifested as swollen lips, at which time anti-allergic treatment can be given by oral loratadine, intravenous application of vitamin C, calcium gluconate and other drugs. In patients with mild symptoms, the swollen lips can be relieved sooner, but if the patient’s symptoms are heavy, they may last for 2-3 days, and if necessary, hormones such as dexamethasone need to be given for anti-allergic treatment; second, patients with mouth ulcers and gingivitis can aggravate the swollen lips because of bacterial infection in the mouth. Oral metronidazole tablets and watermelon cream tablets are needed to reduce the inflammation in the mouth, which can improve the symptoms of swollen lips. Third, due to local trauma.