Shock

In first aid, shock means the body is not getting enough blood flow to vital organs. It is a medical emergency. A person in shock needs urgent help because the brain, heart, and other organs may not be getting enough oxygen.

What does shock mean?

Shock is not just feeling upset or frightened. In first aid, it means the body cannot keep enough blood moving to where it is needed most.

This can happen after severe blood loss, a major allergic reaction, a serious infection, a heart problem, or another emergency that affects circulation.

If shock is not treated quickly, the person can become much more unwell, collapse, or stop breathing normally.

What can cause shock?

Shock can have different causes. Common examples include:

• heavy blood loss from Severe Bleeding
• a severe allergic reaction such as Anaphylaxis
• serious burns or major injury
• severe infection
• heart problems that stop the heart from pumping properly
• major fluid loss from dehydration, vomiting, or diarrhoea

The first aid meaning matters more than the exact medical type. What matters is recognising that the person may be critically unwell and needs urgent help.

What signs might you notice?

Signs of shock can include:

• pale, cool, or clammy skin
• fast breathing or breathing that looks shallow
• weakness or unusual tiredness
• dizziness or feeling faint
• confusion or unusual behaviour
• a fast pulse
• nausea or vomiting
• becoming floppy, collapsing, or Unresponsive

Not every person will have every sign. If someone is getting worse quickly after an injury or illness, treat it seriously.

What should you do in first aid?

If you think someone may be in shock:

1. Follow DRSABCD or a quick Primary Survey so you do not miss more urgent threats.
2. Call 000 for an ambulance.
3. Help with the cause if it is safe, such as controlling Severe Bleeding or helping with an adrenaline device during Anaphylaxis.
4. Help the person lie down if possible. Do not raise their legs.
5. Keep the person still, calm, and warm with a blanket or coat.
6. Do not give them food or drink.
7. Watch their breathing and level of response until help arrives.

If the person has difficulty breathing, is unconscious but breathing, or may vomit, use the Recovery Position if appropriate. If they are not breathing normally, start CPR and follow emergency call-taker instructions.

What should you avoid?

Avoid making the person walk around. Avoid giving them anything to eat or drink. Avoid moving them more than necessary if there may be a head, neck, back, or leg injury.

Is shock the same as circulatory collapse?

The terms are closely related. In plain English, both refer to dangerously poor circulation.

For this site, Circulatory Collapse works best as a supporting term, while shock is the clearer and more useful main first aid page.

Summary

Shock is a medical emergency where the body is not getting enough blood flow to vital organs. Signs can include pale clammy skin, weakness, fast breathing, confusion, and collapse. In first aid, the main steps are to call 000, treat the cause if it is safe, keep the person still and warm, and monitor breathing and responsiveness until help arrives.

How this page is checked

Publisher: First Aid Glossary Editorial Team

Last reviewed: 28 April 2026

Reviewed against: ANZCOR Guideline 9.2.3 – Recognition and First Aid Management of the Seriously Ill Person, including Shock and Sepsis, Healthdirect Australia shock information, and Triple Zero emergency-call guidance.

This page is educational and explains first aid language in plain English. It is not personal medical advice, diagnosis, or a replacement for accredited first aid training. In an emergency in Australia, call Triple Zero (000).