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Heatstroke can be dangerous, according to experts

Both conditions can occur when people get too hot, during a heat wave or in a hot climate. They can also occur when people are doing too much strenuous exercise and experts argue possible heatstroke must be treated as quickly as possible.

Heat exhaustion happened when people become very hot and start to lose water or salt from the body, where as heat stroke means the body can no longer cool itself - causing the person’s body temperature to become dangerously high.

Heatstroke usually occurs when the core temperature of the body reaches over 40 degress celsius.

Heatstroke is less common, but more serious. It can put a strain on the brain, heart, lungs, liver and kidneys, and can be life-threatening, according to NHS Choices.

Experts have revealed the condition causes more than 200 deaths in the US every year. Severe heatstroke requires hospital treatment

The classic signs of heat exhaustion and heat stroke are dizziness and headache

Experts warn heat exhaustion or heatstroke can develop quickly - or gradually over several hours or days.

Clive James, Training Officer for first aid charity St John Ambulance, said: “If you’re out and about on the hottest day of the heatwave try and to keep in the shade, stay hydrated and top up sun protection throughout the day.

“The classic signs of heat exhaustion and heat stroke are dizziness and headache –  if you’re suffering from either find somewhere cool and drink plenty of fluids.

“If your symptoms don’t get any better and you’re concerned, seek medical attention.” Symptoms of heat exhaustion can include dizziness

Symptoms of heat exhaustion can include feeling faint or dizzy, tired and weak, decrease the blood pressure, cause muscle cramps, sweating, an intense third, a fast pulse and urinating less than usual.

Experts warn that if heat exhaustion is left untreated - people don’t drink enough or cool their skin - heat stroke can develop which can cause confusion, disorientation, seizures and loss of consciousness.

Dr Emma Derbyshire, adviser to the Natural Hydration Council and expert nutritionist said: “When you’re on holiday or enjoying the British sunshine topping up your fluid intake might be the last thing on your mind but is very important.

“When the weather heats up this can drive up the body’s temperature and lead to over-heating - feeling very warm, dizzy and disorientated. Water is one of the healthiest ways to hydrate 
“In worst cases, more typically among those exercising for long periods in the heat, this may lead to heat stroke, which can be a very serious condition.

“So, if you are planning some time in the sun, especially if you are looking to exercise it’s important not to forget to drink cool fluids at regular intervals so you feel at your best and can enjoy your holiday to the utmost.

“The NHS provides a useful recommendation that women should drink eight 200ml glasses and men should drink ten 200ml glasses of fluid per day.

“This is supported by European recommendations. Water is one of the healthiest ways to hydrate as it doesn’t contain sugar or calories.”

People most at risk are elderly people, babies and young children and people with a long-term health condition, such as diabetes or a heart or lung condition.

Severe heat exhaustion or heatstroke requires hospital treatment, so call 111 or 999 in an emergency.

Do you know the symptoms of dehydration?