After having one or several Panic Attacks, you may worry about having another attack to the extent that it restricts your level of activity or participation.

This is when you may start avoiding the places you once had a Panic Attack or other situations in which you fear having a Panic Attack.

These situations may include:

Going far away from home

Being away from a safe place or a safe person

Crowded places like grocery stores, public transit, department stores

Being at home alone

Shopping in a mall

Driving on freeways

Driving anywhere by yourself

Using public transportation

Flying in an airplane 

Riding in elevators

Being in high places

Going through tunnels or over bridges

This is called agoraphobia.