Oral cancer symptoms. Persistent mouth sore: A sore in the mouth that does not heal is the most common symptom of oral cancer. Pain: Persistent mouth pain is another common oral cancer sign. A lump or thickening in the cheek. A white or red patch on the gums, tongue, tonsil, or lining of the mouth.
What's the difference between chewing and spit (or snuff) tobacco?. What are the first symptoms of oral cancer? The most common preliminary symptom is a .