Gum bleeding and bad breath can be caused by a variety of reasons, commonly including gingivitis, periodontitis, dental caries, wisdom teeth pericoronitis, etc. Such diseases may cause bacterial infection, resulting in patients with bleeding gums and accompanied by bad breath symptoms, it is recommended that patients promptly seek medical examination to clarify the specific causes, under the guidance of doctors to take the appropriate treatment. 1, gingivitis: mostly related to inattention to oral hygiene, food embedding, dental plaque, calculus and The main manifestation is gum bleeding when brushing or biting hard objects, usually accompanied by gum color becomes bright red or dark red, as well as the root of the tooth swelling discomfort, bad breath and other symptoms; 2, periodontitis: due to periodontal tissue damage, long-term smoking, poor oral hygiene and diabetes, resulting in periodontal tissue inflammation, often appear swollen gums, pain, bleeding, pus and other symptoms, some patients can also It is caused by the bacteria and the sugar in the food to corrode the tooth tissue, which is related to the frequent consumption of food containing more sugar and poor cleaning, and often accompanied by the defect of tooth tissue, i.e. cavity. With the development of the disease, toothache, bad breath and other symptoms may appear, the lesion stimulates the gums may also appear gingival bleeding; 4, wisdom tooth pericoronitis: is due to the gathering of food residues and bacteria around the wisdom tooth, or local injury, triggering inflammatory reaction, can be accompanied by swelling of the tissue around the wisdom tooth, pain, some patients can also appear gum bleeding and bad breath; 5, other: digestive system diseases such as gastritis, gastric ulcer, etc., liver function abnormalities and Some of the diseases with abnormal coagulation function can also show symptoms of bleeding gums and bad breath, and a clear diagnosis should be sought promptly.