Self-injury

Self-injury is what happens when someone is stupid enough to get themselves hurt. In most cases they directly cause the injury, but in other cases it is because their stupidity irritated someone else enough to supply the injury. The latter type of self-injury is especially common in HQ and in Anhk-Morpork.

Some wangsty Mary Sues injure themselves, usually by cutting. In Real Life, this can be a sign of anything from overwhelming stress to clinical depression and is not a trivial matter.

(General information about self-injury can be found here.)

Not to be confused with self-abuse, which means masturbation.