Scorching temperatures continue to blanket Europe, prompting health experts to urge the public to take extra precautions as the mercury climbs. Extreme heat can place significant strain on the body, increasing the risk of a range of heat-related illnesses.

According to the World Health Organization (WHO), a rapid rise in temperature can overwhelm the body’s ability to regulate its internal heat, potentially leading to conditions such as heat cramps, heat exhaustion, heatstroke and hyperthermia.

Extreme heat can also aggravate chronic illnesses, including cardiovascular, respiratory, cerebrovascular and diabetes-related conditions. As the body struggles to cool itself, the first noticeable response is typically heavy sweating. However, prolonged exposure to high temperatures can trigger more serious symptoms, including fever, muscle cramps or weakness, pale skin, a rapid heartbeat and nausea.

These are warning signs of heat exhaustion, a condition that can quickly progress to life-threatening heatstroke if left untreated. At this stage, the body’s cooling mechanisms begin to fail. Sweating may stop altogether, breathing can become difficult, and severe cases may result in fainting or even seizures.

The combination of high temperatures and elevated humidity is particularly dangerous. In hot, dry conditions, sweat evaporates more easily, allowing the body to cool itself. High humidity, however, slows evaporation, making it much harder for the body to release excess heat. Even in dry environments, there are limits to how much cooling sweating can provide, especially as rising temperatures increase the body’s heat load.

Researchers who study the limits of human heat tolerance warn that even moderately high temperatures, when paired with high humidity, can place considerable stress on the heart and other vital organ systems.
To reduce the risk of heat-related illness, experts recommend staying well hydrated throughout the day, applying sunscreen, eating plenty of fresh fruit and avoiding unnecessary outdoor activities during the hottest hours whenever possible.