Bleeding every time you brush your teeth may be caused by oral diseases, or it may be caused by systemic diseases, and it may also be related to the hard texture of the toothbrush or incorrect brushing methods. 1. Oral diseases: Gingivitis and periodontitis are common clinical oral diseases that cause gums to bleed when brushing teeth. (1) Gingivitis: Gingivitis occurs due to plaque, food impaction, etc. It may bleed when eating hard objects or brushing teeth, and may be accompanied by localized swelling and pain of the gums, as well as bad breath and other symptoms; (2) Periodontitis: due to tartar, plaque, trauma, food impaction and other factors lead to periodontitis, can appear loose teeth, easy to bleed and other symptoms. (2) Systemic diseases: Suffering from systemic diseases such as leukemia, thrombocytopenic purpura, hemophilia, aplastic anemia and other systemic diseases may also induce bleeding gums due to abnormal coagulation function. 3. External factors: Brush bristles are too hard, or just start brushing, the method used is not correct, resulting in gum damage, may also lead to bleeding gums when brushing. It is recommended to use a soft bristle toothbrush to brush your teeth, develop good oral hygiene habits, insist on brushing your teeth in the morning and evening, rinse your mouth after meals, and go to the hospital regularly for periodontal scaling (scaling). If the bleeding symptoms do not improve for a long time, go to the hospital for examination and treatment as soon as possible.