At 16 you can still have ulcers, there is no age for ulcers. Yes, have it checked, I had the worst pain ever & found out I had two ulcers, plus I have acid reflux too, but the nexium has about cured that one. All I had to do was watch my diet for a while & was put on prescription strength pepcid to cure my ulcers. I did have the tube down the throat test & they took pics of my two ulcers. The doctor said they were huge but didn't look big to me at all, like smaller than a dime, but I guess they consider that huge & funny to think they could cause all that horrible pain.