What Causes Pain In The Lower Right Rib?

Why does my lower right rib hurt for no reason?
I haven't exercised in a while, nor have I hurt myself. It doesn't hurt to breath or anything just when I touch it. I have felt very tensed lately so maybe its related? I feel very tensed around my neck and upper back. Any possible things out there? I will be seeing a doctor soon but im just very worried. :S Also between my breasts but only on the left side.