The swollen lips in the morning are usually caused by the following factors: 1. The most common factor is infectious factor, when there is viral infection, bacterial infection or fungal infection in the mouth and lips, the clinical symptoms and performance of swollen lips will occur when herpetic changes occur in the mouth and lips. 2. Allergic reaction, formed because of local allergy, when neurological edema and urticaria around the mouth and lips will appear, accompanied by obvious itching and painful symptoms. 3, Swollen lips in the morning, such as wind and stroke in the previous day, will also appear the above clinical symptoms and manifestations. 4, from the perspective of Chinese medicine, it is caused by wind and damp evil entering the body when a person’s immunity is low. 5, toxic conditions will also appear swollen lips in the morning, such as food poisoning, heavy metal poisoning and bad chemical gas poisoning will appear the above clinical manifestations.