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Symptoms of mouth cancer. Mouth cancer can develop on most parts of the mouth, including the lips, gums and occasionally, the throat. The most common symptoms of mouth cancer include: red or white patches in the mouth or throat.
In a few cases, a long-lasting mouth ulcer can be a sign of mouth cancer. Ulcers caused by mouth cancer usually appear on or under the tongue, although you can get them in other areas of the mouth. It's important to detect mouth cancer as early as possible.