Canker sores are small, painful reddish lesions in the mouth that have a white or yellow center. Some causes of canker sores are spicy/acidic foods, vitamin deficiencies, braces, and stress.

Canker sores and oral cancer lesions may seem similar but there are ways to tell the difference. A lesion that's red, ...

Causes of a sore throat on one side includes the flu, tonsillitis, a canker sore, or a tumor. Look out for other symptoms to help you identify what's causing your sore throat on one side.