The tonsil canker sore is among the less frequent of the mouth canker sores.
A tonsil canker sore can be located anywhere on the tonsil.
Unless they are huge or in large numbers, canker sores on tonsils are less painful than other mouth canker sores because you can't bit them and they are less subject to irritation when you speak. But if they are badly located on the tonsil they make swallowing difficult.
If you often have canker sores on tonsils, AftaZen is a preventive treatment that can keep them away from your tonsil. Learn how: