I am bleeding from my back rear its only when I go to the toilet I've been to the doctors and hospital they don't know why I isn't got piles tears or anything on the outside or inside of my bum I have had camera up m bum and down my throat and still can not find anything if any one knows or got any ideas please let me know as its been going on for a year and 8 months now

Is it fresh blood (bright red) or old (black)?

i am bleeding from my back rear its only when i go to the toliet ive been to the doctors and hospital they dont know why i aint got piles tears or anything on the outside or inside of my bum i have had camera up m bum and down my throat and still can not find anything if any one knows or got any ideas please let me know as its been going on for a year and 8 months now

I am sorry to hear this,but WHAT do you think online advice would do for you if medical professionals haven't found the problem?

You might have better luck contacting a different doctor... perhaps House?

Seriously,there is NO WAY anyone can diagnose your situation online with ANY accuracy, perhaps a new doctor,a new specialist,perhaps crossing some borders to get better medical facilities.. but to take any advice about something like this? Seriously.