Agoraphobia is diagnosed when you experience marked fear or anxiety about at least two specific types of situations: using public transportation, being in open spaces, being in enclosed spaces, standing in line or being in a crowd, or being outside the home alone. The fear isn’t just discomfort—it’s intense enough that you either avoid these situations entirely, need someone with you to endure them, or experience significant distress when facing them. The key difference is that this fear is out of proportion to any actual danger, lasts for six months or more, and significantly interferes with your daily life. Many people feel nervous in certain situations, but agoraphobia means your world has become smaller because of avoidance. It often develops after experiencing panic attacks in these situations, leading to a fear of having another panic attack where escape might be difficult. The condition can become so severe that some people become housebound, unable to leave home for months or even years without treatment.