A little bit is normal. It happens to me if I don't smoke cigarettes for a few days. I should quit. I'll try again tomorrow. Anyway. Back to your question.

It's really unpleasant but it'll go away eventually.

If you're still having trouble in a week or if it gets really bad (or if you see any black or red bloody colors) then go to the doctor.

It might be from quitting but it also could be from something else so just watch it and see how it goes.