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vitalfork.com > Blog > Health & Wellness > What does hot weather do the body?
What does hot weather do the body?
Health & Wellness

What does hot weather do the body?

VitalFork
Last updated: June 19, 2025 7:44 am
VitalFork
Published June 19, 2025
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Contents
What does hot weather do the body?What does excessive heat for our body?Why do the body react to heating like this?How can I be safe in summer?If I think someone has heat tiredness or hetstroke then what should I do?Who is the highest risk from hot weather?Do some medicines increase the risk of hot weather?Does heat kill?

What does hot weather do the body?

19 hours ago
James Galagher
Health and science correspondent,@Jamestgallagher
Getty images a young woman interacted on a phone wearing sunglasses, while keeping herself cool using a portable fan. Getty images

Warm weather during summer can affect anyone, but some people take more risk of serious damage.

Experts recommend checking on people who can be more weak, such as older people and children.

What does excessive heat for our body?

As the body gets hot, blood vessels opens. This reduces blood pressure and works hard to the heart to push the blood around the body.

This process can cause mild symptoms such as an itchy heat rash or swollen legs.

At the same time, sweat causes loss of fluid and salt and, significantly, the balance in the body changes.

This, combined with low blood pressure, can cause heat tiredness. Symptoms include:

  • Dizziness
  • nausea
  • Fainting
  • Confusion
  • muscle cramps
  • Headache
  • Heavy sweat
  • Tiredness

If the blood pressure goes away significantly, the risk of heart attack increases.

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Why do the body react to heating like this?

Our bodies try to keep the main temperature of about 37C whether we are in an ice storm or heatwave.

This is the temperature on which our bodies have developed to work.

But as the weather gets hot, it is difficult for the body to keep its main temperature down.

It opens more blood vessels near the skin to lose heat in our surroundings and starts sweating.

As the sweat evaporates, it dramatically increases the heat lost from the skin.

A graphic lists certain effects of heat on the body, including: not enough water from fasting and unconscious feelings; Increase in heart rate; Sweat; And inflamed ankles.

How can I be safe in summer?

  • Stay inside a cool house
  • Drinking lots of fluids and avoiding too much alcohol
  • Sun rays keep out of the sun between 11:00 and 15:00 when the strongest
  • Living in the shade, using sunscreen with a high SPF and UVA rating, and wearing a wide-brimd hat
  • End to avoid physical exercise
  • Carry water with
  • 10 tips for sleeping in hot weather
  • Six ways to keep your house cool
Getti image on a beach, a mother puts sunscreen on her young daughter who is in her father's arms.  Getty images

If I think someone has heat tiredness or hetstroke then what should I do?

If you see someone who thinks that you think heat exhaustionNHS says you need:

  • Take them to a cold place
  • To lie them and lift your feet a little
  • Get them to drink lots of water – sports or rebellion drinks are also fine
  • Cool their skin – spray or sponge them with cool water and fan them. Cold packs around the armpit or neck are also good

If they can be cooled within half an hour, heat tiredness is not normally severe.

However, if they do not heal within 30 minutes, they are risk heat stroke,

This is a medical emergency and you should call 999 immediately.

People with heatstroke can stop sweating despite being very hot. Their temperature may exceed 40C and may have a seizure or lose consciousness.

  • What is the difference between heat tiredness and heatstroke?
A graphic showing the difference between heat tiredness and heatstroke. Symptoms of heat exhaustion are listed: feeling unconscious or dizzy; Excessive sweating; Clame skin; Nausea or vomiting, and muscle cramps. Symptoms of heatstroke are: feeling confused; Not sweating; A body temperature above 40C with warm skin with dry skin; nausea or vomiting; (Consciousness may lose or experience objection or seizures.

Who is the highest risk from hot weather?

People who grow up or have some long -term conditions – such as heart disease – are sometimes able to cope with stress heat on the body.

Diabetic can lose the body more quickly and some complications of the disease can change the ability of blood vessels and sweat.

Children and those who are less mobile can also be more vulnerable. Brain diseases, such as dementia, can leave people unaware of the heat or be unable to do anything about it.

Those who are homeless will also come in contact with the Sun. People living in top-floor flats will also face high temperatures.

Do some medicines increase the risk of hot weather?

Yes – But NHS says that people should take their medicine normally, and focus on staying calm and hydrated.

Diuretics – Sometimes called “water pills” – increases the amount of water to the body. They are widely taken, including heart failure. In high temperatures, they increase the dangers of dehydration and imbalance in major minerals in the body.

AntiHepertensive – who reduce blood pressure – can combine with blood vessels that are diluted to deal with heat and cause dangerous drops in blood pressure.

Some medicines for epilepsy and Parkinson’s can prevent sweating and make the body difficult to cool itself.

Other drugs such as lithium or statin can be more concentrated and problematic in the blood if there is too much fluid loss.

The graphic is showing some suggestions to remain calm, including: keeping hydrated; Wearing loose clothes in breath cloth and a hat; Living in the shade; Limiting travel and exercise; Using fans, ice and cool rainfall to reduce body temperature.

Does heat kill?

During 2022 – which saw the highest recorded temperature in England at 40.3 ° C – the estimated 2,985 so -called “additional deaths” as a result of the heat.

Mostly additional deaths related to heat are caused by stroke caused by stress of heart attacks and attempts to keep the body temperature stable.

Once the thermometer begins to kick a high mortality after passing 25C-26C.

However, evidence suggests that deaths are caused by high temperatures rather than “peak summer” in spring or early summer.

This can be because we begin to change our day to day behavior because heat progresses and we use more to deal with heat.

The evidence of previous heatwaves is that deaths increase very quickly – within the first 24 hours of a heat.

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