Defining normal and abnormal here are several possibilities: We are likely to label behaviour as abnormal if they are intensely distressing to the individual. Personal distress is neither necessary nor sufficient to define abnormality. Most behaviours judged abnormal are dysfunctional either for the individual or for society. Society"s judgments concerning the deviance of a given behaviour. Conduct within every society is regulated by norms. Both personal and social judgments of behaviour enter into considerations of what is abnormal. Abnormal behaviour: behaviour that is personally distressful personally dysfunctional, and/or culturally deviant that other people judge it to be inappropriate or maladaptive. The belief that abnormal behaviour is caused by supernatural forces goes back to the ancient chinese, egyptians, and hebrews, all of whom attributed deviance to the work of the devil. The release the spirit, a procedure called trephination was carried out.