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What are symptoms and signs of canker sores?
Canker sores are painful sores inside the mouth. They may occur on the tongue, the lining of the cheeks, the gums, the inside of the lips, or the soft palate on the back of the roof of your mouth. Common symptoms of canker sores include the following:
A burning, tingling, or prickling sensation, up to 24 hours before the sore appears
Crater-like ulcers that are white, gray, or yellow in color, with a red border
Sores are usually painful
Difficulty speaking, eating, or swallowing
Less common symptoms that can also indicate a more serious underlying infection include:
swollen lymph nodes,
thrush infection in your mouth or throat.
Contact your doctor or dentist if your canker sores are
larger than usual,
lasting more than three weeks,
causing severe pain even after taking over-the-counter pain medication,
causing difficulty drinking enough fluids to stay hydrated,