Oral cancer poses a significant threat to human health, and its early symptoms are not obvious. Many cases are mistakenly thought to be chronic non-healing oral ulcers, and in fact, the best treatment opportunity has already been missed once it is discovered. Early manifestations include the appearance of lumps and nodules in the mouth. The lumps appear as white, smooth patches, and red patches can emerge in the mouth, along with ulcers. The mouth may also repeatedly bleed. If there are unexplained, long-lasting ulcers that do not heal, and the individual is over 40 years old with the presence of cauliflower-like growths, then it is crucial to immediately seek hospital treatment. Early smear tests and pathological examinations should be conducted for prompt diagnosis and treatment to achieve good outcomes.