Multiple causes.: Injury, vitamin deficiency, GI disease and other causes. See this site for more info. http://www.mayoclinic.com/health/canker-sore/ds00354/dsection=causes.
Answered 6/10/2014
5.3k views
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
9 doctors weighed in across 3 answers
5 doctors weighed in across 3 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question