A phobia is an intense, irrational fear of a specific situation, activity, or thing that, in actuality, doesn’t pose any true danger. People with phobias have a feeling of uncontrollable anxiety when they are exposed to the source of their phobia. This psychological reaction causes many physical symptoms. Some symptoms include shaking, rapid heartbeat, difficulty breathing, sweating, chest dizziness, and a feeling of overwhelming anxiety. When a person has such physical reactions to something they fear, they are said to be having a panic attack.