You can get canker sores from a bacterial infection, stress, heredity and trauma. Some recurrent canker sores can be associated with inflammatory bowel diseases. Canker sores are not contagious.
I'm struggled with canker sores since I was a teenager. I dreaded accidentally biting my lip because I knew it would turn into a canker sore that would take a week or two to heal. A couple years ago I started taking an Omega-3 supplement for various reasons.
I didn't realize it at the time but my canker sores stopped! Later on, I ran out of my supplement and did not buy a refill for a couple weeks. In that time period the sores came back.
After starting back on the Omega-3's they were gone! Do a quick search and you'll see there are others out there with the same experience.
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