One reason for swollen gums without pain is due to chronic local inflammation of the gums. For example, in patients with periodontitis, when periodontitis is not active, many patients with periodontitis only have swollen gums but no obvious gum pain or gum bleeding symptoms, especially some people take anti-hypertensive drugs or anti-epileptic drugs for a long time, which can cause drug-related gum hyperplasia, making the hyperplastic gums harder in texture, but no obvious bleeding or pain symptoms. Patients with fibrous gingival tumors may also have swollen gums that do not hurt. In addition, dental diseases, such as chronic pulpitis without timely treatment, cause periapical inflammation, and periapical inflammation of the tooth will be swollen and painful in the gum at the apical region of the tooth, some patients even do not have obvious swelling and pain, but only an inflammatory polyp or sinus tract of pus drainage in the apical region, but the tooth may have swelling and discomfort, in this case, root canal treatment should be done on the tooth.