A panic attack is a sudden episode of intense fear or anxiety that triggers severe physical reactions, even when there is no real danger. Symptoms can include a racing heart, shortness of breath, sweating, trembling, and feelings of impending doom. These episodes can occur unexpectedly or be triggered by specific situations. Panic attacks are often associated with panic disorder, a type of anxiety disorder. While they can be frightening, they are not life-threatening. Many people experience panic attacks at some point in their lives, and understanding them can help reduce their impact and improve coping strategies.