Agoraphobia: Forget the dictionary definition of agoraphobia (fear of open spaces). Agoraphobia, in a more practical sense, is really a fear of your anxiety sensations themselves. As you start to associate more activities with anxiety, the number of places and people in your life that feel comfortable will logically become more limited. Some anxious people become so overwhelmed that even leaving their homes can be difficult. Don't worry, agoraphobia is one of the most common phobias there is!