What happens during a panic attack? (3-minute explainer)

A panic attack feels catastrophic in the moment — racing heart, chest pain, difficulty breathing, and an overwhelming sense of dread. Understanding what is actually happening in your body can significantly reduce its power over you.

The physiology

A panic attack is a surge of the fight-or-flight response without an actual threat. Your amygdala — the brain's alarm system — fires, releasing adrenaline. Heart rate and breathing speed up. Blood is diverted to muscles. You may feel tingling in your hands or feet as carbon dioxide levels drop from rapid breathing.

Why it feels like a heart attack

Many of the physical sensations of panic — chest tightness, shortness of breath, pounding heart — overlap with cardiac symptoms. This overlap is what makes panic attacks so frightening and why many people visit the emergency department before receiving a correct diagnosis.

Why slow breathing works

Deliberate slow breathing raises carbon dioxide levels and signals to your nervous system that the threat has passed. Breathing in for 4 counts, holding for 4, and out for 6 is enough to begin calming the response within 60–90 seconds.

What to remember during an attack

You are not in danger. The sensations are uncomfortable but not harmful. They will pass. Focusing on your breath and a fixed point in the room helps anchor you until the wave subsides.