Mike,
Usually repeated infections or sleep apnea. In my case, I had asymmetrical swelling (right side), but no apparent infection. Upon removal, an abcess was discovered but had no symtoms. I also had bleeding complications, so spent the weekend in the hospital and visited the OR twice. Not fun. I am of the age that first began the idea that we should not remove them unless there was evidence for strep throats, etc. Well, I think I would have them removed in every child, which seems abit radical, but so is uncontrolled bleeding and a couple of visits to the OR under general anesthesiology...