gum cancer symptoms
Some of the most common oral cancer symptoms and signs include: 1  Persistent mouth sore: A sore in the mouth that does not heal is the most common symptom of oral cancer. 2  Pain: Persistent mouth pain is another common oral cancer sign. 3  A lump or thickening in the cheek.  A white or red patch on the gums, tongue, tonsil, or lining of the mouth.