Obsessive-compulsive disorder is characterised by the presence of persistent intrusive thoughts or concerns, and is usually associated with compulsions, which are mental acts or behaviours which an individual engages in to attempt to get rid of the obsessions and/or decrease his or her distress i.e. excessive hand washing.

Panic disorder is an anxiety disorder characterized by recurrent unexpected panic attacks.

Generalised anxiety disorder is characterized by excessive, exaggerated anxiety and worry about everyday life events with no obvious reasons for worry.

Major depressive disorder is a mood disorder characterised by at least 2 weeks of depressed mood and/or diminished interest and pleasure in activities.

Bipolar mood disorder is a lifelong illness, which may have an episodic, variable course. The presenting episode may be manic, hypo manic, depressive or mixed. By definition, a diagnosis of bipolar disorder requires either a current or previous episode of mania or hypomania.