What is fainting and what causes it?

Fainting is when someone briefly becomes unresponsive, often causing them to fall to the ground. It happens because for a moment, there is not enough blood flowing to the brain.

People often faint as a reaction to pain, exhaustion, hunger, thirst, or emotional stress. It is also common for people to faint after they have been standing or sitting still for a long period of time and move too quickly, especially if they’re feeling hot.

Signs and symptoms

What to look for:

  • a brief loss of response, often causing them to fall to the ground
  • slow pulse
  • pale, cold skin and sweating
  • feeling hot or cold
  • dizziness
  • feeling unwell

What to do

  1. Advise them to lie down

  2. If possible, elevate their legs slightly using a stool, cushions or pillows. Make sure they get plenty of fresh air and ask other people to stand back

  3. Reassure them and help them to sit up slowly over a few minutes, when they feel better

  4. If they stay unresponsive, open their airway, check their breathing and prepare to treat someone who is unresponsive

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Use the primary survey to quickly assess the situation and check the casualty for injuries or conditions that could be immediately life threatening. Find out what to do.

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If an adult is unresponsive and not breathing normally, you need to call 999 or 112 for emergency help and start CPR straight away. Learn what to do.

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Heat exhaustion is caused by a loss of salt and water, usually through excessive sweating. Find out what to look for and what to do.

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