Swollen and painful right upper gums are usually considered to be suffering from diseases such as apical periodontitis, periodontal abscess and gingivitis. The specific cause of the disease needs to be confirmed after checking in the hospital after the doctor’s view. 1. Periapical periodontitis: Due to bacterial infection inside the pulp cavity of the patient’s teeth, spreading through the apical foramen to the tissues around the root tip, or the tooth being subjected to undue external force, etc., causing damage to the periapical tissues, which in turn causes periapical periodontitis. Clinically, it may show the symptom of swelling and pain in the right upper gum. 2. Periodontal abscess: generally due to the development of periodontitis to the advanced stage, the periodontal band wall occurs limited suppurative inflammation, in which the pus is not discharged in time, resulting in localized swelling. The patient may have the symptom of right upper gum swelling and pain. 3. Gingivitis: Localized plaque at the gums due to food impaction, misaligned and crowded teeth, etc., which in turn leads to gingivitis. Occasionally, it may be accompanied by localized swelling and pain in the gums, which may lead to swelling and pain in the upper right gum. If you experience symptoms of swollen and painful upper right gums, it is recommended that you go to the hospital in a timely manner for early and regular treatment.