A persistent irrational fear of a specific object, activity or situation that results in a compelling desire to avoid the perceived fear. Psychiatric conditions classified in Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-R) as anxiety disorders. When confronted with the phobic stimulus, patient reacts with intense anxiety, usually realizes the fear is excessive or exaggerated. When a fear causes significant distress and interferes with normal functions of life, then it is considered a psychiatric disorder.
- Agoraphobia: Fear of being trapped in a situation where escape is impossible or difficult. Fear centers on (1) fear of being alone, (2) fear of being away from home and (3) fear of being in a place from where escape is difficult - seen most often in association with panic disorder.
- Simple phobia: Fear of a discrete stimulus such as animals, insects, heights, flying, closed spaces (claustrophobia), blood-injury phobia
- Social phobia: Fear of humiliation or embarrassment in social situations where person may be under scrutiny by others, e.g., performance anxiety, speaking in public, or fear of using public toilets
- System(s) affected: Nervous
- Genetics: No consistent genetic pattern
- Incidence/Prevalence in USA: 1 month prevalence of all phobic conditions: 6.2%; lifetime prevalence: 12.5%
- Predominant age:
- Agoraphobia - onset 18-35 (mean 24)
- Simple phobia fear of animals - onset usually in childhood (mean 4.4 years)
- Simple phobia fear of heights, claustrophobia - 4th decade
- Other simple phobias - mean 22.7 years
- Social phobia - late childhood, adolescence (mean 19 years)
- Predominant sex:
- Female > Male, overall phobias
- Male = Female, social phobia