Tooth swelling is a painful swelling of the gums, which may be due to periodontal abscess, gingivitis, apical periodontitis and other diseases. 1. Periodontal abscess: usually due to the development of periodontitis to the advanced stage, the emergence of periodontal pockets, periodontal pockets within the wall of the suppurative, confined inflammation, and pus can not be discharged due to, and also with the decline in immunity, serious systemic diseases and other factors. General acute periodontal abscess patients often appear gum redness, edema and other symptoms, there will be throbbing pain, which can be manifested as tooth swelling and pain. 2. Gingivitis: usually due to localized plaque, but also with poor restorations, food impaction, misalignment and crowding. Patients often have bleeding when brushing or biting hard objects, and the texture, shape and color of the gums will also change. Some patients can also be accompanied by localized itching and swelling of the gums, pain and other symptoms, which can also appear in the phenomenon of tooth swelling and pain. 3. Periapical inflammation: usually due to bacterial infection, physical stimulation and other conditions, and also related to treatment factors. Patients often have spontaneous pain, occlusal pain and other symptoms, and there will also be apical gum swelling, which can also occur in the case of tooth swelling and pain. Some patients may also experience fever and fatigue. It is recommended that patients with symptoms of tooth swelling and pain, identify the cause of the disease in a timely manner, and follow the doctor’s instructions for targeted treatment, so as not to delay the condition.