Phobias are intense and irrational fears of specific objects or situations that can interfere with daily life. Common phobias include fear of heights, enclosed spaces, spiders, and flying. Phobias can be treated with therapy, medication, or a combination of both. Cognitive-behavioral therapy is a common treatment for phobias and involves gradually exposing the person to the feared object or situation in a safe and controlled manner to help them overcome their fear.