Many of us had no symptoms at all or symptoms that were pretty vague until the tumor got very large. In my case I had a tumor growing on the right tonsil and, at first, the only symptom was some slight horseness. After a period of time elapsed (and several visits to a GP, etc.) it got large enough to displace my uvula and cause sleep apnea type symptoms at night. During that period, I also had a sensation of something being caught in my throat. By this time it was readily visible, yet until I went to a knowledgable ENT, was undiagnosed as cancer. I never had any experience of pain. A few here have had some pain associated with their cancer but every cancer seems to be a little different so the only way to know for sure is what Brian said in his post and wait for the official diagnosis. It could be many things besides cancer so try to take a deep breath, get some rest and get it ruled out.

I might add, as well, that once you start looking closely in your mouth, you will notice parts of your anatomy that you have probably never been aware of. I thought that my salivary glands on my cheeks were a recurrence and my ENT and I had a good laugh over that one (after the fact of course). Many people, like myself, for some reason, tend to bite themselves and will develop a whiteish callous along the centerline of where your teeth meet.