What causes canker sores on tongue and why do they hurt?

Canker sores: Cause is generally unknown although stress, local irritation, autoimmune response likely culprits. They hurt because the surface epithelium (similar to skin) is eroded and nerve endings are exposed. It could be other things as well, so see a dentist for quicker relief or if it doesn't completely resolve in 14 days.

Canker sores: are the most common oral lesions. A canker sores on tongue affects the ability to eat comfortably. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned see your dentist after 10 days or visit today for laser immediate amelioration.