For a few months now, I've been having a dull pain in the right side (middle/lower) of my abdomen. It comes and goes, and isn't a severe pain, but sometimes I need to sit down to stop it. It's worse when I'm hungry, exercising or straining (picking up heavy objects etc). I went to the doctors but she said she wasn't too worried, yet didn't give me any idea of what it could be. I could really use the help, I want to make sure it's nothing serious so I'm not worrying about it. It stopped for a little while, but is back again. (In case this is of any importance, I'm a 15 year old female).