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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.
Symptoms of oral thrush. Symptoms of oral thrush can include: white patches (plaques) in the mouth that can often be wiped off, leaving behind red areas that may bleed slightly. loss of taste or an unpleasant taste in the mouth. redness inside the mouth and throat. cracks at the corners of the mouth.