Gum bleeding is one of the common symptoms in dentistry and refers to small amounts of bleeding from the gums either spontaneously or due to minor irritation. There are many causes of gum bleeding, and in addition to simple localized problems in the mouth, it may also be an oral lesion manifestation of other systemic diseases. It can also appear in other diseases of the whole body and may indicate diseases of other systems, such as leukemia, after exposure to radioactive radiation, autoimmune diseases, etc. Diagnosis: 1. In mild cases, it is manifested only by blood in the saliva when sucking, brushing, or chewing harder foods. 2.Severe cases bleed more or even spontaneously when the gums are slightly irritated. 3, in general, chronic inflammation of the gums is a common cause of gum bleeding, so gum bleeding is mostly seen in patients with periodontitis and gingivitis; but sometimes it can also be the oral manifestations of certain systemic diseases, which should be given sufficient attention. 4, periodontal diseases include gingivitis, periodontitis, walking horse chancre, gingival capillary hemangioma, gum cancer, etc. 5. Systemic diseases include various blood diseases and some gynecological diseases related to endocrine. 6, less common are vitamin c deficiency, hereditary capillary dilation, hyperthermia, etc. 7, early gum inflammation is not treated in time, the periodontal ligament is attacked, the alveolar bone supporting the teeth is destroyed and absorbed, there will also be bad breath, gum overflow pus, and even lead to loosening and loss of teeth.