Early symptoms of oral cancer from betel nut eating are hard nodules and ulcers. With the development of the disease, patients will also have recurrent oral ulcers or aggravation of ulcers, loose teeth, numbness in mouth and enlarged lymph nodes. Frequent consumption of betel nut may increase the risk of oral cancer. In the early stage of oral cancer, there will be epithelial proliferative hard nodules in the mouth, ulcers on the surface of oral mucosa, the surface of the ulcers is red, there will be white spots in the center of the red color, and some patients will occasionally have irritating pain in the mouth. If the patient’s oral cancer aggravates, the patient will have recurrent oral ulcers, and the center of the oral ulcers will be necrotic, and the edge of the oral cavity will be dike-like or florid ectasia, or nodular cauliflower-like proliferation. Some patients will also have loose teeth, unexplained numbness of the tongue or upper and lower jaws, and persistent enlargement of lymph nodes in the lower jaw. If patients have oral ulcers or hard nodules after eating betel nut frequently need to be alerted that it is an early symptom of oral cancer, patients need to consult doctor in time to check the cause of the disease, and they can choose appropriate treatment measures under the guidance of doctor.