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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.
The most common symptom of salivary gland cancer is a painless lump in your jaw, cheek, mouth or neck. Other symptoms of salivary gland cancer include: pain in your mouth, ear, jaw, throat or neck that doesnât go away.