Phobia is defined as an irrational fear of a specific object, situation or activity, often leading to persistent avoidance of the feared object, situation and activity. Fear is disproportionate to the danger perceived. Patient suffering from phobia recognises fear unjustified, but unable to control it, severely distressed by it which leads to persistent avoidance of the particular object, situation or activity.

AGORAPHOBIA: Characterised by an irrational fear of being in places away from the familiar setting of home. It includes fear of open spaces, crowded places(buses, cinema hall, meeting hall etc.), public places from where easy escape from public view is not possible according to the person .

SPECIFIC PHOBIA: A specific phobia is a marked and persistent fear of an object or situation which brings about an excessive or unreasonable fear when in the presence of, or anticipating, a specific object; the specific phobias may also include concerns with losing control, panicking, and fainting which is the direct result of an encounter with the phobia. Specific phobias are defined in relation to objects or situations whereas social phobias emphasize social fear and the evaluations that might accompany them.

SOCIAL PHOBIA: Unlike specific phobias, social phobias include fear of public situations and scrutiny which leads to embarrassment or humiliation in the diagnostic criteria. People with social phobia have extreme feelings of self-consciousness built into powerful fear. As interpersonal dysfunction is a risk factor for depression, there are some negative outcomes for adolescents with social phobia.