A panic attack is typically identified by a sudden onset of intense fear or discomfort accompanied by a combination of physical and emotional symptoms that peak within minutes. Common signs include a rapid or pounding heart rate, sweating, trembling or shaking, shortness of breath or feeling smothered, chest pain, dizziness or lightheadedness, nausea, numbness or tingling, feelings of unreality or detachment, fear of losing control or dying, and chills or hot flashes. These symptoms often come on unexpectedly and may last from a few minutes up to around 20 minutes, though sometimes longer. If several of these symptoms occur together suddenly and intensely without an immediate danger, this is a strong indication of a panic attack. It is important to seek medical attention to rule out other serious conditions such as heart issues if symptoms are new or severe.