Gum swelling can be caused by many reasons, the common ones are bad lifestyle, oral factors, nutritional deficiencies and blood system diseases, etc. You should seek medical examination and treatment according to the specific causes. Bad lifestyle: eating spicy and irritating food can cause gum swelling, and not rinsing and brushing on time after meals can also lead to gum swelling due to food embedding, so you should try to eat a light diet and maintain good hygiene habits to improve the symptoms. Second, oral factors: 1, wisdom tooth eruption: wisdom tooth is about to erupt will cause gum swelling accompanied by pain, may cause wisdom tooth pericoronitis, it is recommended to go to the Department of Dentistry, if it is a mild dental obstruction, you can first observe, if it affects the surrounding teeth can be considered extraction; 2, periapical inflammation: gums may appear abscess, redness, chewing discomfort, pain and other symptoms, you can use root canal treatment, open pulp drainage, remove the infection and fill the treatment; 3, the gum may appear abscess, redness, chewing discomfort, pain and other symptoms. Removal of infection and filling treatment; 3, acute gingivitis, periodontal abscess: there may be gingival redness, swelling, shiny surface with painful symptoms, can be treated by rinsing the periodontal band, containing hydrogen peroxide or incision and drainage; 4, wisdom teeth pericoronitis: there will be gingival swelling and pain or even the formation of abscess, can apply hydrogen peroxide rinse blind band, with periodontal debridement, removal of plaque calculus treatment; 5, other: local dental inflammation, Acute gingival papillitis, tooth decay, drug gingival hypertrophy, gingival tumors and other oral diseases can cause the occurrence of gingival swelling, it is recommended to perform stomatoscopy, x-ray and other examinations to clarify the cause of treatment. Third, nutritional deficiency: if there is a lack of vitamin A, B or folic acid, can cause gum hypertrophy, bleeding, should pay attention to supplementation of nutrients. Fourth, blood system diseases: if there is aplastic anemia, thrombocytopenia, etc. will also lead to gingival hyperplasia, enlargement and oral mucosal bleeding, should be treated for the specific causes of blood diseases.