I have a killer one right now. I get them only when I am super stressed out. Sometimes they are my first indication that I'm actually stressed!
I thought I had been dealing well with setbacks and stresses this past week, but the lovely canker that popped up this morning reminded me otherwise. I took a "me night" by not cooking (thank you pizza man), reading trashy mags and relaxing in the bath. As annoying it is, sometimes cankers are a reminder to me to slow down and chill out. Anyone else get cankers??