The condition of bleeding when the teeth are sucked belongs to bleeding gums. There are more causes for bleeding gums, and it is not necessarily a major disease. Generally, first consider whether the gum bleeding occurs due to the toothbrush being too hard to stimulate the gum area when brushing, or simply due to oral diseases. The next consideration is due to hormone level changes, blood diseases, systemic diseases or tumors, etc.: I. Physiological factors: During menstruation and pregnancy, due to changes in the body’s hormone level, most women have capillary expansion and brittleness at the gums, which can easily cause gum bleeding. Second, pathological factors: 1, oral diseases: such as periodontitis, gingivitis, will be due to inflammatory stimulation resulting in redness and swelling of the gums, bleeding when sucking hard, usually less bleeding, can stop on their own, but need to promptly seek medical treatment to improve the symptoms; 2, blood diseases: such as scurvy, hemophilia, aplastic anemia, thrombocytopenic purpura or acute leukemia, etc., are prone to 3, systemic diseases: some diseases can lead to low coagulation function, such as anemia, liver cirrhosis, systemic lupus erythematosus, etc., also prone to gum bleeding; 4, tumors: some tumors growing at the gums, such as gingival tumors, hemangiomas or gum cancer, etc., can cause the appearance of gum bleeding. In addition, gum bleeding can easily occur after oral surgery or dental implantation or extraction, and it can be relieved gradually by following post-operative precautions according to the doctor’s instructions.