and hormonal changes can cause canker sores in the mouth. Cancer in the oral cavity can cause similar sores. Mouth ulcerations related to cancer often don't heal and are irregular in shape. They may ...

Canker sores are painful ulcers that occur in the mouth, including on gums. Here's a look at how to deal with them.

Question: My teenage daughter has a sore on the side of her lip. She is prone to cold sores but she says this feels entirely different. She does sleep on that side of her face at night and I ...