I'm 15, almost 16. Since recently I've been having bright red blood come out with my poop. This doesn't always happen, only seems to happen when the poop is large and it does stop after a while. The blood is not mixed with the poop either.

I experience no pain while pooping and its just like a regular poop except my anus feels a little sore afterwards.

I'm really worried about this. I sit in front of my PC a lot every day and I read that sitting a lot can cause this. I also started drinking a lot of water and I already get a lot of fibre. I'm also a healthy eater and don't eat lots of junk food.

I don't want to tell my parents yet, could someone please tell me what the problem is?

Oh and I also have a bump right on top of my butt crack which burst recently and a bad smelling liquid came out of it. I think this was a hemorroid, so could this have been caused by sitting for too long?

Please answer, I'm really worried that it might be cancer.