There are many causes of swollen upper gums, such as improper diet, trauma, periodontal infection, tumors and other causes. 1. Improper diet: too hard, too spicy food stimulation, there may be due to local mechanical or chemical friction stimulation resulting in swelling of the upper gums. 2. Trauma: traumatic stimuli such as falls and car accidents may also lead to edema and swelling of the upper gums. 3. Periodontal infections: For example, infectious diseases such as gingivitis, periapical infection, and apical periodontitis can also cause swelling of the upper gums accompanied by toothache and gum pain. 4. Tumors: For example, tumors in the gums or tumors in the alveolar bone can also cause symptoms of swollen upper gums. There may be other reasons for the swelling of upper gums, it is recommended to go to the hospital for examination, to clarify the cause of the disease and follow the doctor’s instructions for treatment.