Mental illness
There are a few specific diagnoses which are defined by conduct problems and violence. These include conditions such as childhood conduct disorder, adult antisocial personality disorder or psychopathy. There are conflicting findings about how much specific symptoms are linked to an increase in violent behaviour. These symptoms include psychosis (hallucinations or delusions) that can occur in disorders such as schizophrenia, delusional disorder or mood disorder. The factors that lead to violent behaviour are more often demographic or economic in nature, such as being young, male, of lower socioeconomic status or of abusing drugs, including alcoholism, to which some people are particularly vulnerable.