Well, self harming is addictive, like a previous reply says there is a scientific explanation, explaining how the brain works and all that, but Im sure it also has other reasons... in my case I hurt myself as a punishment, I do something wrong? I cut or hit myself until I see bruises... "I deserve this" I think, also sometimes I have violent impulses but I refuse to be violent towards someone other than myself, so I hit and cut myself... its hard to explain to someone who doesnt self harm just how amazing it feels, the relaxation, the tranquility... better than many meds lol