Patients with red and swollen gums are usually caused by fire or eating too spicy or irritating food, and may also be caused by some pressure on the gums caused by porcelain teeth. In addition, it may also be related to local diseases such as gingivitis, periodontitis, pulpitis, periapicalitis, periodontal abscess, pericoronitis, and systemic bleeding diseases such as leukemia and purpura. 1, gingivitis: if seen in children during tooth replacement, usually eruptive gingivitis, in addition, it may also be chronic gingivitis, mostly seen in patients with poor oral hygiene habits, mainly manifested as red and swollen gums, pain, etc.; 2 The main symptoms are bad breath, bleeding gums, redness and pain, as well as periodontal pockets, loose teeth, gum atrophy, alveolar bone resorption, etc.; 3. Pulpitis: mainly divided into acute pulpitis as well as chronic pulpitis, which can cause patients to have red and swollen gums symptoms. In addition, due to the presence of infection in the pulp, it can also lead to pain and bleeding when eating; 4, periapical periodontitis: usually caused by severe trauma to the tooth or the development of advanced pulpitis, can lead to the symptoms of red and swollen gums, usually accompanied by pain, tooth discoloration, bite weakness, fistula, loose teeth and other symptoms; 5, periodontal abscess: may be caused by periodontitis, deep periodontal pockets and other oral diseases constantly It may also be related to diabetes, or oral treatment due to improper operation resulting in gum damage and other factors. The main manifestations are gum redness and swelling, loose teeth, etc.; 6, pericoronitis: usually caused by the failure of normal eruption of teeth, commonly wisdom teeth pericoronitis, may also be related to improper care after tooth extraction, may lead to inflammation of the soft tissue around the tooth, forming pericoronitis, can be manifested as gum redness and swelling, and in serious cases even lead to loss of appetite, eating disorders, fever, headache, interstitial infection and other symptoms; 7, leukemia , purpura: such bleeding diseases can cause gum bleeding, which leads to the symptoms of gum redness and swelling.