Some people’s gums bleed frequently, often noticed when they brush their teeth in the morning or at night. So, why do gums bleed? Common causes of gum bleeding caused by local factors: Periodontal disease: Due to tissue lesions around the teeth, the gums become edematous and the capillaries expand and become congested, which often causes gum bleeding once you chew harder foods or brush your teeth improperly. Calculus stimulation: Because the calculus attached to the neck of the teeth has rough edges and contains many kinds of germs, it will stimulate the gums, which will lead to redness and inflammation of the gums and cause bleeding. Caries cavity in the cervical part of teeth: If the caries cavity in the cervical part of teeth is not filled in time and allowed to develop under the gum margin, because the edge of the caries cavity is irregular and sharp, it will often stimulate the gum and cause the gum to inflame, break down and bleed. The gingival bleeding caused by the above-mentioned common local lesions can be stopped as long as the local lesions are treated in time and the bleeding can be stopped after anti-inflammation. Common causes of gingival bleeding caused by systemic diseases: Geriatric hypertension: due to vascular sclerosis and increased capillary fragility, the gingival tissue is prone to break and bleed more than once, and the amount of bleeding is high. Hemophilia: i.e., coagulation factor deficiency disease, which bleeds more than once the gums and other soft tissues are slightly broken. Cirrhosis of the liver: hypersplenism, etc. Because of low blood clotting function, you will also have gum bleeding symptoms. Blood disorders: such as blood cancer (acute and chronic leukemia), thrombocytopenic purpura, etc. Therefore, for those who still have gum bleeding even after removing local irritants and anti-inflammatory and other treatments, do not be careless and go to internal medicine departments such as hematology as early as possible for further examination to clarify the cause and timely treatment to avoid misdiagnosis and mistreatment.