Gum swelling and pain during the monthly period can be seen in periodontitis or wisdom teeth pericoronitis, periapical periodontitis, depending on the situation need to be periodontal, root canal treatment, local rinsing or drug treatment. 1. Periodontitis. Long-term chronic periodontal inflammation can cause gum swelling and pain, easy bleeding, mostly due to poor oral hygiene and local tartar accumulation caused by the need for periodontal treatment, remove gingival subgingival tartar, local rinsing chlorhexidine treatment. 2. Wisdom tooth pericoronitis. Wisdom tooth pericoronitis, the gums around the wisdom teeth will appear red, swollen, painful, and even overflow pus phenomenon, need to use saline, hydrogen peroxide rinse gums around the wisdom teeth, local use of iodine glycerin, to be eliminated after the elimination of inflammation, and consider the removal of wisdom teeth. 3. Periapical inflammation. Tooth decay caused by inflammation to reach the periapical area, there is no drainage channel, inflammation destroys the periapical bone, breaking through the bone wall to the apical area of the mucous membrane caused by the swelling of the gums on the cheek, the need for endodontic treatment to establish a drainage channel, eliminate the inflammation, the swelling will be slowly reduced. Gums swollen and painful during the monthly period, it is recommended to go to the hospital in time to check the cause of the disease, targeted treatment, the use of drugs need to follow the doctor’s instructions.