Hi there, I am a healthy 17 year old girl, I bleed when going to the loo...I have had this for a while now and I had heard about bowel cancer but I thought it was nothing, until recently when I go running after a certain amount of time I get pains in my lower tummy, it's akin to period pains, and i feel sick at the same time...Is it possible I have bowel cancer?? Thank you.