Bleeding gums from brushing may be related to over-exertion, lack of vitamins, gingivitis, periodontitis, etc., and need to be treated according to the specific cause. 1. Excessive force: excessive force when brushing, or toothbrush is too hard, the gums are stimulated may bleed, you can reduce the intensity of brushing, or change a softer bristles of the toothbrush. 2. lack of vitamins: such as lack of vitamin C, may cause scurvy, resulting in bleeding gums, it is recommended that appropriate vitamin supplements, eat more fruits and vegetables, can be under the guidance of the doctor, vitamin supplements. 3. Gingivitis: plaque causes inflammatory reaction of the soft tissue of the gums, resulting in bleeding gums when brushing or biting hard objects, you can reduce gum irritation and relieve the symptoms by cleaning the teeth and removing plaque and calculus. 4. Periodontitis: plaque invades the periodontal tissues, resulting in damage to the gums, periodontal membrane, etc., and periodontal abscess occurs, which may bleed when brushing the teeth, and it is necessary to carry out pus drainage and remove calculus, so that the gums return to normal. 5. Leukemic gingivitis: when there is spontaneous bleeding, gingival swelling and pain, and even gingival necrosis need to be vigilant is not leukemic gingival lesions. There may also be systemic symptoms, such as accompanied by lymph node enlargement. At this time should go to the hematology department for systemic treatment. If the gums bleed when brushing teeth, it is recommended to go to the hospital for diagnosis, to clarify the cause of the disease, and actively treat it, and pay attention to oral hygiene, and do regular dental examination.