As with many emotional and mental health issues, where so many keep their suffering a secret, it can be very hard to gain accurate figures. Another important consideration is that often even the friends and family of the person will be unaware of the self-harm, to such a degree is this secrecy.. What we do know though is that in the UK alone self-harm is responsible for over 150000 admissions to A&E a year, and this is only counting those who admit to their wounds being self inflicted. Research conducted anomalously through charities and support groups also indicate that only about 15% of people who self-harm will seek medical attention for their wounds, so this 150000 really can only be seen as the tip of the ice-berg.
People of all ages and from all backgrounds may at some time engage in self-harm, though it is most commonly seen among adolescents. The NICE report into self harm indicates that the average age changes of adolescence have been removed, but for many the issue will continue into adulthood. Self harm seems to be more common in females than in males overall, though in fact more boys than girls under the age of 10 are admitted to hospital due to self-harm. In adolescence, girls may be around two or four times likely than boys harm in different ways and may be more likely to cover it up as the result of an accident or a fight. Self harm also occurs in adults, and there is some evidence that adults who self harm are at greater risk of serious consequences such as suicide attempts or hospital admission.
One group of adults who seem particularly vulnerable to self harm are prisoners, over half of female prisoners on remand say that they have self-harmed at some point in their lives. This may be because some of the common triggers of self-harm are more common in those who are vulnerable to committing crimes than in the general population, the actual prison environment may also serve to cause self-harm as prisoners are likely to know others who self-harm, may be discouraged from openly expressing emotion, and are often unlikely to gain access to support for mental health issues.