If the ulcers inside the mouth are not good for a long time and there are many bumps and dents, it is recommended to go to the hospital in time to check, which may be caused by oral cancer. 1.Sluggish tongue movement and perception: This is the main early symptom of oral cancer. If tongue movement and perception are suddenly dull in daily life, numbness and numbness, you must go to hospital for medical treatment as soon as possible. 2.Lumps: Some patients in the early stage of oral cancer will show the symptoms of lymph node metastasis, so enlarged lymph nodes will be found when touching the neck. 3. Obvious pain: Although the pain is not obvious in the early stage of oral cancer, if pain occurs, it is usually caused by the tumor invading the nervous system, which is also a phenomenon of cancer spreading. 4.Dysfunction: Patients in early stage of oral cancer will have limited movement of closed mouth, which is usually caused by tumor invasion to jaw joint in oral cavity, so it is recommended to go to hospital for examination in time. Usually patients in the early stage of oral cancer will have the above symptoms. At the same time, patients should strengthen the care of oral hygiene and develop good dietary habits in daily life, quit smoking and limit alcohol to reduce the adverse stimulation to oral mucosa, so as to stay away from oral cancer.