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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, also called oral cancer, describes a cancerous tumour, growth or sore developing in the mouth. On the gums. Mouth cancer is related to throat cancer affecting the throat (pharynx). Mouth cancer can be life-threatening if it is not diagnosed and treated as early as possible. Mouth cancer can develop in the mouth itself, called primary oral cancer. It can also spread to the mouth from cancer elsewhere in the body. This is called secondary oral cancer, or metastatic oral cancer.