My 12 y.o. daughter has been complaining off and on of pain in her right side - she says it feels like her ribs - for a few months. She hadn't mentioned it for awhile and so I thought that it had gone away. I originally thought that perhaps it was because she carries a very heavy book bag that is more of a shoulder bag than a backpack. It also hurts more when she has been active, like cleaning her room. She mentioned it again the other day and then last night she mentioned that her breast on that side is noticeably smaller than the other. I understand that this can happen since I also have that problem. However, since it is on the same side of her body as the rib pain I am more concerned. She seems fine and even showed me that she can kick herself in the behind by jumping up and throwing her legs behind her and hit her behind (she is so talented) so I just don't know if it is serious or not. Can it just be growing pains? We just got health insurance and I am planning on taking her to our regular family doctor unless a specialist is warranted. She started her period 2 months ago as well. Thanks for any help.