Bleeding from the mouth may be due to a broken oral mucosa due to incorrect brushing or eating and biting the oral mucosa. It may also be indicative of vitamin deficiency, allergy, intraoral diseases, systemic diseases, etc. So oral bleeding may be a sign of many diseases, it is recommended to judge according to the specific situation. 1, lack of vitamin C: some people due to lack of vitamin C, capillaries at the gums become fragile, a slight external force may lead to capillary rupture bleeding, oral bleeding. At this time, patients may also be accompanied by loose teeth, wound healing difficulties, anorexia, fatigue and other symptoms, oral bleeding can suggest vitamin C deficiency; 2, oral diseases: periodontitis, gingivitis, gum cancer and other diseases can lead to bleeding in the mouth when brushing teeth or to hard food, and in serious cases, there may be spontaneous massive bleeding. If periodontal disease causes oral bleeding, it is recommended to go to the dental hospital for dental biopsy in time to determine the cause and treat under the guidance of the doctor; 3. Systemic diseases: Leukemia, pernicious anemia, hemophilia, AIDS, aplastic anemia and other systemic diseases may cause oral bleeding, and in severe cases, it may cause massive oral bleeding. Patients should promptly compress the bleeding site to stop bleeding, seek medical treatment, use coagulants to stop bleeding locally under the guidance of a doctor, examine the cause and carry out symptomatic treatment; 4, endocrine disorder diseases: a small number of women during menstruation or pregnancy, elevated progesterone hormone or elevated sex hormones, which produce slight stimulation of gum tissue, thus inducing non-specific inflammation, and then a small amount of bleeding in the oral cavity. It is recommended that under the guidance of a doctor, local hemostatic drugs be used to stop the bleeding, and after the end of the menstrual period or pregnancy, the patient can go to a hospital gynecologist for targeted treatment. The above examples only part of the diseases that cause oral bleeding, it is recommended that patients in the discovery of oral bleeding, timely medical treatment, under the guidance of professional doctors, symptomatic treatment. Usually, you can eat more fruits and vegetables to supplement the nutrition required by the body.