A phobia is an excessive and irrational fear reaction. If you have a phobia, you may experience a deep sense of dread or panic when you encounter the source of your fear. The fear can be of a certain place, situation, or object. Unlike general anxiety disorders, a phobia is usually connected to something specific. The impact of a phobia can range from annoying to severely disabling. People with phobias often realize their fear is irrational, but they’re unable to do anything about it. Such fears can interfere with work, school, and personal relationships. Genetic and environmental factors can cause phobias. Children who have a close relative with an anxiety disorder are at risk of developing a phobia. Distressing events, such as nearly drowning, can bring on a phobia. Exposure to confined spaces, extreme heights, and animal or insect bites can all be sources of phobias.