F4LL3N said:
I think that might be right.
It feels like relief, if you ask me. I'd liken it to masturbating, where the (mental) pain is like arousal, and the cutting is the climax. The sensation sort of just surges through your body and relieves. It's like cutting open a hole to let the tension out.
I wouldn't personally compare it to anything sexual.
Now that I think about it, I'm pretty sure when your in pain your body releases dophemines or whatever they are as a natural pain killer. Bleeding would also reduce blood pressure which helps your brain.
Kinda on topic: I used to get random nose bleeds and sometimes I'd just stand over the sink and let it bleed out for a few minutes. It helps get rid of headaches. Cutting would have a similar effect on top of release hormones.
So regardless of what some people say, that it's strictly for attention, no actually it's quite often not. I guess that's why a lot of people say they don't know why they do it. And most people would probably tell you it makes them feel better.
EDIT: Yeah, perhaps adrenaline. Although I do remember hearing the natural pain killer thing. Like if you have a headache you should have sex to get rid of it.