Gums redness and pain is mainly caused by periodontitis, apical periodontitis or wisdom tooth pericoronitis, periodontitis, root canal treatment or pericoronary rinsing and medication must be carried out. 1. Periodontitis: Periodontitis is caused by calculus or tartar stimulation of the gum tissue, the main symptoms include red, swollen and bleeding gums, etc., and when periodontitis is in acute attack, there will also be abscesses and pain in the gums, etc.; periodontal treatment (such as ultrasonic scaling, periodontal scraping, or periodontal medication, etc.) is required to effectively treat the above symptoms. 2. Periapical periodontitis: Periapical periodontitis causes inflammatory substances in the root canal to spread to the periodontal tissues, leading to infection of the gum tissues at the root tip and symptoms of redness, swelling, and even pain; root canal treatment is required to clean up the inflammatory substances in the root canal in order to cure the symptoms of redness, swelling, and pain in the gums. 3. Wisdom tooth pericoronitis: Wisdom tooth pericoronitis is mainly caused by the gum tissue around the crown of the gums due to food blockage and the symptoms of infection and inflammation, the main clinical manifestations include redness and swelling of the gums, pain or pus spillage, etc.; must be carried out pericoronary flushing treatment, the wisdom tooth pericoronary gingival blind pockets within the food debris or inflammatory substances rinsed out, and coated with iodized glycerine, minocycline and so on in order to alleviate the related symptoms. It is recommended to consult a doctor for a clear diagnosis or symptomatic treatment of red and painful gums to prevent delays.