Heat Exhaustion Explained: Why the Body Fatigues in High Temperatures
When ambient temperatures rise, the human body must work harder to keep its core temperature within the normal range of about 36.5 °C to 37.5 °C. It does this by increasing blood flow to the skin, accelerating the heartbeat and dilating blood vessels, and producing sweat to dissipate heat. The extra effort raises energy consumption, which can cause fatigue, palpitations and shortness of breath.
If water and mineral loss become excessive, body temperature can climb to 38 °C‑40 °C. Symptoms may include intense tiredness, headaches, visual disturbances, dizziness, nausea, vomiting, rapid breathing and profuse sweating. Elderly people, young children and athletes are especially at risk.
Health authorities advise staying in cool, dry, well‑ventilated places, limiting strenuous activity to early morning or late evening, drinking at least two litres of moderate‑temperature water (or fruit juice or rehydration solutions), applying ice packs to the head, neck, armpits and groin, and seeking medical attention if symptoms worsen.
Entities: human body
Claims
What the coverage asserts, and how well corroborated each claim is across sources.
- [● 5 SOURCES] The body cools itself by sweating and directing internal heat to the skin, which increases circulation, heart rate and vessel dilation. (All articles)
- [● 5 SOURCES] The human body works harder to regulate its core temperature when ambient heat is high. (All articles)
- [● 5 SOURCES] Recommended measures include staying in a cool, dry, well‑ventilated place, drinking at least two litres of moderate‑temperature water or rehydration solutions, applying ice packs to head, neck, armpi (All articles)
- [● 5 SOURCES] If symptoms persist, a medical professional should be consulted promptly. (All articles)
- [● 5 SOURCES] Elderly people, children and athletes are at higher risk of heat‑related exhaustion. (All articles)
- [● 5 SOURCES] Normal core body temperature is between 36.5 °C and 37.5 °C. (All articles)
- [● 5 SOURCES] Severe dehydration can raise body temperature to 38 °C‑40 °C and cause symptoms such as fatigue, headache, visual disturbances, dizziness, nausea and vomiting. (All articles)
- [● 5 SOURCES] Increased energy expenditure from heat regulation can cause fatigue, palpitations and shortness of breath. (All articles)