A phobia is an excessive, irrational fear or anxiety related to specific objects or situations that is persistent and disproportionate to any actual threat. Phobias are classified as specific, social, or agoraphobia. They can be triggered by traumatic incidents, genetics, or stress and cause symptoms like trembling, difficulty breathing, and nausea. While fear protects us from real dangers, phobias are excessive and interfere with daily life. Phobias are treatable through therapies like exposure, cognitive behavioral therapy, and medications.