A panic attack is a sudden episode of intense fear or anxiety that triggers physical symptoms such as a racing heart, sweating, trembling, or difficulty breathing. It usually develops abruptly and can last for several minutes. Symptoms may vary from person to person, but typically include a feeling of impending doom, fear, or apprehension. Physical symptoms may include chest pain, shortness of breath, dizziness, nausea, and tingling or numbness in the hands or feet.