Eating gum pain may be caused by acute gingival papillitis or acute necrotizing ulcerative gingivitis, the treatment is to remove local irritants and antibacterial treatment, as follows. 1. Acute gingival papillitis: generally caused by mechanical or chemical stimuli, treatment to remove local irritants, including embedded food, fish, broken toothpicks, filling body protrusion. 2. Acute necrotizing ulcerative gingivitis: an infection caused by a variety of microorganisms, can be used locally oxidizing agents, such as hydrogen peroxide rinse containing gargle, releasing a large number of new ecological oxygen, kill or inhibit anaerobic bacteria, but also take metronidazole, tinidazole and other anti-anaerobic drugs to help control the disease. Medications should be used under medical supervision. There may be other causes of gum pain when eating, it is recommended to go to the hospital in time, to clarify the cause of the disease and then targeted treatment.