Liver function tests are all normal. Gum bleeding can be caused by inflammation of the gums, hormone level changes, tumors, blood diseases, medication factors and so on. 1. Gum inflammation: such as periodontitis, interdental papillitis, necrotizing ulcerative gingivitis and gingival hyperplasia, etc., all of which may cause bleeding gums. 2. Hormone level changes: such as long-term oral hormone patients are prone to gum bleeding, may be related to the gingival capillaries affected by sex hormones and expansion, brittleness changes. 3. Blood diseases: such as acute leukemia, hemophilia, thrombocytopenic purpura, aplastic anemia, agranulocytopenia, etc., may have symptoms of bleeding gums. 4. Tumors: such as hemangioma, hemangiomatous gingival tumor, early gingival cancer, etc., which may also show symptoms of bleeding gums. 5. Systemic diseases: such as hypersplenism, late nephritis, systemic lupus erythematosus, etc. Gum bleeding symptoms may occur. 6. Drug factors: such as aspirin, warfarin, heparin and other treatment or prevention of coronary heart disease and blood clots, easy bleeding tendency. If you have bleeding gums, you should consult a doctor in time to clarify the cause, under the guidance of a professional physician for treatment, not blindly use their own medication, resulting in adverse consequences.