Understanding panic attacks: what happens in your body

A panic attack is a sudden episode of intense fear or discomfort that peaks within minutes. It often comes with strong physical symptoms — a racing heart, shortness of breath, dizziness, chest tightness, sweating or trembling.

Panic attacks are more common than many people realise. They are frightening, but they are not physically dangerous in themselves — though new or severe symptoms should always be checked by a doctor to rule out other causes.

What triggers the body response

During a panic attack, the body’s fight-or-flight system activates. This is the same system that prepares you to respond to danger. It releases adrenaline, which causes:

• Heart rate increases — pumping blood to muscles
• Breathing speeds up — taking in more oxygen
• Blood flow shifts — away from digestion toward major muscles
• Muscles tense — ready to act

These changes are useful if you need to run from danger. During a panic attack, they happen when there is no actual physical threat — which is why the sensations feel so confusing and alarming.

Common physical symptoms

People often report:

• pounding or racing heartbeat
• chest tightness or discomfort
• shortness of breath or feeling of choking
• dizziness, light-headedness or faintness
• sweating or hot flushes
• trembling or shaking
• numbness or tingling in hands or feet
• nausea or stomach upset
• feeling detached from yourself or your surroundings

Not everyone experiences all of these. A few symptoms can feel overwhelming on their own.

Why panic can become a cycle

After a panic attack, many people understandably fear it happening again. That fear can lead to:

1. Avoidance — staying away from places or situations where panic occurred
2. Body monitoring — constantly checking heart rate, breathing or sensations
3. Safety behaviours — sitting near exits, carrying water, needing someone with you

Avoidance and monitoring can reduce panic in the short term. They also teach the mind that certain places or sensations are dangerous — which can make the next attack more likely.

When to see a doctor

Seek medical advice if you:

• experience chest pain, fainting or symptoms you have not had checked before
• are unsure whether symptoms are panic or something else
• have not had a physical health check after new symptoms appear

Once a doctor has ruled out other causes, many people find it reassuring to understand that panic symptoms, while unpleasant, are not harmful.

Things that often help during an attack

• Stay where you are if it is safe — leaving reinforces the idea that the situation is dangerous
• Slow your breathing — breathe out slightly longer than you breathe in
• Name what is happening — “this is a panic attack, it will pass”
• Ground yourself — notice five things you can see, four you can touch, three you can hear
• Wait for the peak to pass — most attacks peak within 10–20 minutes

Longer-term support

If panic attacks are frequent or you are avoiding more of daily life, structured support can help you understand the cycle and rebuild confidence gradually.

Want structured support?

If you would like help putting these ideas into practice, explore our Overcoming Panic coaching or book a £10 initial assessment to see if coaching is a good fit.