Repeatedly swollen and painful gums may be related to wisdom teeth pericoronitis, gingivitis, periapical abscess and so on. 1. Wisdom tooth pericoronitis: wisdom teeth do not grow out, the surrounding gums will be inflamed under the stimulation of food impaction, plaque and calculus, and the swelling and pain of the gums around the wisdom teeth in the acute stage is also very obvious. 2. Gingivitis, periodontitis: the main reason is poor oral hygiene, a lot of plaque, tartar, food impaction. It causes chronic gingivitis or periodontitis, and when it is acute, it can cause swollen and painful gums. 3. Periapical abscess: when the invasion of stronger bacteria triggers an infection, purulent inflammation occurs, expanding to the deep connective tissue, the pus can not be discharged out of the pocket, and an abscess occurs. Gums may also be red and swollen in the acute phase, with significant pain. When recurrent swelling and pain of the gums occur. It is recommended to seek timely medical attention, follow the doctor’s instructions for further examination, and carry out targeted treatment or therapy with the help of the doctor.