Does anybody get canker sores? What makes them appear? I've never had them in my entire life, but I got 2 on my lower gums and about 10-15 on the roof of my mouth and in my throat last month, making it impossible to eat almost anything for almost 2 weeks. Went to the doctor twice and they said they were canker sores and would resolve themselves. Almost exactly a month later, they are starting to come back. I just started my cycle again last month and read that it could be hormonal. Or not hormonal. Apparently nobody knows (not even the docs), so just wondering what others have experienced. Not looking forward to the next 2 weeks if it gets as bad as last month, and definitely don't look forward to this every month.