'Abnormal behaviour' can be defined as behaviour which is unusual, socially unacceptable, dangerous to themselves or others, or whether a person is in a significant amount of personal distress. However, each of these must be defined individually and the cultural background must always be taken into account. Although there is a continuum along which everyone will at some point suffer depressed moods, several different criteria must be taken into account before deciding whether the depressed mood a person may be suffering from is abnormal or not. …
