For a good while now every time i go to the toilet i wipe my bum and there is always blood. sometimes it will like a little spot on the toilet paper. But today there was soo much blood i thought i was on my period. Now it hurts a lil bit when i sit. 

I have been told by my father a couple of times to go to the doctor. I just want to know what maybe could be the cause of this. Maybe the food i eat im always eating Mc Donald's and wendy's all these fast foods. Could this be the cause of why im always constipated, cause im always straining myself stool to come out.

What is the problem?