Of note is that Non-Suicidal Self-Injury (NSSI) people say they actually feel better after hurting themselves.
There is much to learn about self-injury
Michael Kulla, For the Poughkeepsie Journal 12:56 p.m. EST March 4, 2016
This article is about young people who cut, scratch, burn, carve, interfere with wound healing or bang their heads against a solid object.
Tattooing and piercing are usually not considered maladaptive because they are culturally sanctioned forms of expression. The intent of harming oneself per se is not suicidal and is referred to as Non-Suicidal Self-Injury (NSSI). NSSI is especially prevalent among adolescents with approximately 1 in 6 engaging in this behavior at least once. About 15 percent of college students have participated in it. Overall about 1.3 percent of kids 5 to 10 self-inflict, though rates climb greatly if the child has marked anxiety or chronic mental stress. Reported self-abuse among adults is about 5 percent.
Previously it was thought to be a behavior engaged in by young women, but recently NSSI was found to be equally prevalent among young men. Women, though, may be more likely than men to cut themselves, while men are more likely to engage in burning their skin.
Individuals with a history of NSSI report more borderline personality disorder (BPD) characteristics than those without a NSSI background. BPD is marked by such tendencies as emotional instability, unstable relationships and chronic feelings of emptiness.