Many oral diseases can present with gum swelling, such as gingivitis, periodontal abscess, and periapical periodontitis, all of which can cause swelling. Therefore, gum swelling is not necessarily indicative of oral cancer. However, the early symptoms of oral cancer are not very clear and typically include persistent oral ulcers that heal slowly, bleeding, pain, and swelling. Particularly in patients over 40 years of age, if such symptoms are present, it is advisable to visit a dental specialist hospital for an examination to treat the primary disease timely and to rule out the possibility of oral cancer.