People who cut because something is wrong or something has happened to them and they don't know how else to handle how they feel. Many of them have been abused, sexually, physically, or mentally. Some do it because they feel numb and want to feel the pain or just feel something. Others do it to punish themselves for something that they've done. The cuts range from little scratches that barely bleed to life threatening cuts or burns. Overall, its a way for someone who doesn't know what to do to express themselves.
I am an emo cutter because I feel neglected, was molested when I was very young, and when I eat (anorexia).
Emo cutters usually need to or should talk to someone about it.