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Medically reviewed by Last updated on Jul 7, 2024.

What is heatstroke?

Heatstroke is when your body severely overheats. Heatstroke happens when you do physical activity in hot conditions without drinking enough liquids. Normally, the body has a cooling system that is controlled by the brain. The cooling system adjusts to hot conditions and lowers your body temperature by producing sweat. With heatstroke, the body's cooling system is not working well and results in an increased body temperature.

What increases my risk of heatstroke?

What are the signs and symptoms of heatstroke?

How is heatstroke diagnosed?

Your healthcare provider will take your temperature. You may also need any of the following tests:

What first aid can I do for heatstroke?

How is heatstroke treated?

Treatment options

The following list of medications are related to or used in the treatment of this condition.

How can I prevent heatstroke?

Call your local emergency number (911 in the US) if:

When should I seek immediate care?

When should I call my doctor?

Care Agreement

You have the right to help plan your care. Learn about your health condition and how it may be treated. Discuss treatment options with your healthcare providers to decide what care you want to receive. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.