In a few instances, a long-standing mouth ulcer could be a warning sign of cancer.

“Ulcers caused by mouth cancer usually appear on or under the tongue,” the NHS says.

However, if you smoke, drink alcohol, or have a HPV (human papilloma virus) infection, and you have had an ulcer for more than three weeks, do book a doctor’s appointment.

“It’s important to detect mouth cancer as early as possible,” the health body says.

“If mouth cancer is detected early, the chances of a complete recovery are good.”

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Post source: Express