What is heat exhaustion?

When we get hotter, our blood vessels open up, which lowers blood pressure.

This means the heart has to work harder to circulate blood, causing milder symptoms like swelling or heat rash.

It also affects our fluid and salt intake through perspiration, and alters their balance in our bodies.

When this is combined with a drop in blood pressure, heat exhaustion can result.

Symptoms include nausea, dizziness, muscle weakness, sweating, cool skin, irritability, and confusion.

According to the Centers for Disease Control and Prevention, a key sign is a body temperature above 41°C – which can occur within 10 to 15 minutes of being in hot weather.


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