Bleeding gums are caused by gingivitis or periodontitis, or by blood clotting disorders. The common cause of bleeding gums is gingivitis or periodontitis. After eating, food debris accumulates around the teeth and calcifies under the action of saliva to form tartar, and the gum tissue is in a state of congestion, which slowly leads to bleeding gums or spontaneous bleeding. In this case, a scaling is needed to remove the tartar and other irritants, and then a rinse is applied to improve the bleeding symptoms. Bleeding gums can also be caused by blood clotting disorders. Thrombocytopenia can cause bleeding, and leukemia, scurvy or hemophilia are also systemic factors in bleeding gums. Diabetes may also cause bleeding gums. Some of the gum bleeding is also related to pregnancy. Changes in hormone levels in the body during pregnancy can cause gum bleeding, which can resolve on its own when the pregnancy is over. Bleeding gums can also be caused by vitamin C deficiency, incorrect brushing, or hard brushing. So bleeding gums can be caused by chronic gum inflammation, blood disorders, or vitamin deficiency.