Agoraphobia

Why agoraphobia's feared situations have nothing in common

The 2015 reference Phobias: The Psychology of Irrational Fear lists them plainly:

• enclosed spaces such as a cinema or a crowded restaurant
• wide open spaces such as a car park
• standing in a queue, or being in a crowd
• being at home alone, and being away from home
• bridges, driving and public transport

A list containing both a crowded restaurant and an empty car park cannot be organised around physical space. What organises it is a judgement about what would happen next: whether escape would be difficult, or help unavailable, if panic-like or embarrassing symptoms began. The object of the fear is the person's own body in a place with no exit.

How safety behaviours keep agoraphobia going

The accommodations are specific and recognisable. Always carrying a phone. Locating the nearest exit on arrival. Sitting on the aisle. Driving only within a fixed radius of home, which has a name in the literature, the safety zone. Leaving the house only with a particular person.

Each of those makes a situation tolerable and each of them maintains it, because the situation was survived with the aid rather than without it. In severe cases the radius shrinks to nothing and the person becomes housebound.

Whether agoraphobia can exist without panic disorder

For most of its recent history agoraphobia was not a diagnosis in its own right. It was attached to panic disorder, and a person was diagnosed either with panic disorder with agoraphobia or with agoraphobia without a history of panic disorder. DSM-5 decoupled them, making both stand-alone diagnoses that can be given together.

The evidence pulls in two directions and the material carries both. On one side, most people who reach a specialist develop agoraphobia after panic disorder begins, and agoraphobia is best understood in that account as a behavioural consequence of repeated panic attacks. One researcher, quoted at length, put the sceptical position bluntly: out of forty-one people with agoraphobia seen at a clinic over a year, only one fitted a diagnosis of agoraphobia without panic attacks, and even that classification was questionable.

On the other side, the World Health Organization's classification does not require the fear to be about escape or help at all, which breaks the causal chain the DSM version assumes. Current thinking treats agoraphobia without panic as a real and distinct condition that goes largely unnoticed, precisely because the people who have it are less likely to seek treatment. Traumatic experience, including bullying or abuse, is named as a route to it.

How common agoraphobia is

Agoraphobia affects about 1.7 per cent of adults, women about twice as often as men. Panic disorder with or without agoraphobia affects roughly 5.1 per cent of Americans, and about a third of people with panic disorder have agoraphobia alongside it.

Then a figure that does not fit the rest: only 0.17 per cent of people with agoraphobia do not also present with panic disorder. That is a claim of near-total overlap sitting in the same article as the argument that agoraphobia without panic is a valid and under-recognised condition, and this entry records the contradiction rather than choosing between them.

Onset is given as typically mid to late twenties, with the condition rare in children and becoming more common at sixty-five and above. Without treatment it is uncommon for it to resolve.

What exposure therapy achieves for agoraphobia

In vivo exposure has an effect size reported between 0.78 and 1.34, and the effects increased over time, holding up to twelve months after treatment. Cognitive behavioural therapy resolves the condition for about half of those treated, and group and individual delivery show no significant difference between them. Psychological and pharmacological treatment combined performed better than either alone.

The instruction that carries the most weight is a small one: the aim of exposure is the disappearance of residual and sub-clinical avoidance, not merely the end of panic attacks. A person who no longer panics but still sits on the aisle has not finished.

Eye movement desensitisation and reprocessing has been studied here with poor results, and is described as reserved for cases where cognitive behavioural approaches have failed or where the agoraphobia followed trauma.

Why the evolutionary accounts of agoraphobia disagree

Two accounts are offered. The preparedness account holds that human defensive systems respond strongly to cues associated with ancestral threats, so avoidance of exposed or unfamiliar environments would have been favoured, and the same machinery misfires in low-risk modern settings.

The second is more interesting because it splits the condition rather than explaining it whole. Primary agoraphobia without panic may be a specific phobia of exposed open ground without cover, which was once useful. Agoraphobia with panic may be something else entirely: an avoidance response secondary to the attacks, attached to wherever they happened. Two conditions, one name, and the argument about panic viewed from the other end.