The reasons why wisdom teeth will swell after extraction are as follows: 1. wisdom teeth are located in the innermost part of the mouth, where the blood circulation of soft tissues is relatively rich, and extraction produces a large amount of blood that will enter multiple gaps in the jaw surface, causing sore throat and jaw facial swelling; 2. when removing obstructed wisdom teeth, it is necessary to cut the gums, separate the soft tissues, and remove the alveolar bone, and these operations will cause a large amount of blood to be produced on the one hand, and on the other hand will cause a stress reaction in the body, resulting in When wisdom teeth are close to the maxillary sinus, they sometimes cause perforation of the maxillary sinus, resulting in swelling of the jaw and face; 4. When wisdom teeth are deeply buried, extraction will damage the large blood vessels in the jaw bone, causing massive bleeding and facial bruising when the bruising is severe.