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Oral 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.  A lump or thickening in the cheek.
Mouth Cancer- The roof of the mouth can become agitated when mouth cancerous growths form. Cancerous growths can be melanoma or lymphoma. Lymphoma typically begins as a growth on the tongue or tonsils and spreads to other areas of the mouth.