My tongue feels like its been stuck by a burr. what could cause this?

Tongue Pain: Tongue pain can be caused by trauma (sharp food - like a chip or fishbone), ulcer from infection or tumor, burn, etc... Examination of the tongue should give you a good idea of the cause. Is there a cut, ulcer, or object seen? Feeling the tongue can give you an idea of a mass that is under the surface. Persistant symptoms or a mass/ulcer warrant an eval with your doctor. Hope this helps!

Did you bite it?: Maybe you bit your tongue when you were not aware of the incident. If the symptoms do not improve in a few days see a doctor.