What does hot weather do to the body?

Here is the latest breaking news from around the world: What does hot weather do to the body? Image source, Getty ImagesByJennifer ClarkePublished25 July 2019Updated 22 June 2026Periods of hot weather can affect anyone, but some people run a greater risk of serious harm. Experts recommend that those who may be more vulnerable - such as older people and babies and young children - should take extra precautions.

What does extreme heat do to our bodies? As the body gets hotter, blood vessels open up. This lowers your blood pressure and makes your heart work harder to push the blood around the body.

The Details

This process can cause mild symptoms such as an itchy heat rash or swollen feet. At the same time, sweating leads to the loss of fluids and salt and, crucially, the balance between them in the body changes. This, combined with the lowered blood pressure, can lead to heat exhaustion.

Symptoms include:dizzinessnauseafaintingconfusionmuscle crampsheadachesheavy sweatingtirednessIf blood pressure drops too far, the risk of heart attacks rises. How does sunscreen work, and how much do you need to use? Published22 JuneStaying safe in water when the weather's hot Published27 MayWhy do bodies react this way to heat?

Our bodies strive to keep a core temperature of about 37C whether we are in a snowstorm or a heatwave. That is the temperature at which our bodies have evolved to work. But as the weather gets hotter, it is harder for the body to keep its core temperature down.

What Experts Say

It opens more blood vessels near the skin to lose heat to our surroundings and starts sweating. As the sweat evaporates, it dramatically increases the heat lost from the skin. How can I stay safe in the heat?

Image source, Getty ImagesThe UK Health Security Agency (UKHSA) recommends looking out for those who may struggle to keep cool, such as older people, those with underlying conditions and those who live alone. Other advice includes:staying cool indoors by closing curtains on rooms that face the sundrinking plenty of fluids and avoiding too much alcoholkeeping out of the sun between 11:00 and 15:00 when the sun's rays are strongeststaying in the shade, using sunscreen with a high SPF and UVA rating, and wearing a wide-brimmed hatavoiding physical exercise in the hottest part of the daycarrying water with you if travellingAnyone tempted to cool off in rivers and open water should consult local warning signs and consider any hidden dangers, external. No one - especially babies, young children and animals - should ever be left in a locked vehicle.

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The development has drawn wide international attention, with diplomatic circles watching closely.