As scorching heatwaves grip cities and temperatures soar past 100°F (38°C), many people instinctively turn to cold showers for instant relief. However, health researchers warn that this quick fix might actually do more harm than good. While the icy water may feel refreshing on overheated skin, it can disrupt the body’s ability to regulate core temperature. According to experts writing in The Conversation, “although diving into a cold bath or shower straight after being out in the heat might feel nice on your skin, it isn’t doing what is needed to reduce the core temperature of the body.” In fact, a cold shower can trap heat inside the body and potentially put additional strain on your cardiovascular system, especially dangerous during extreme heat.
Why cold showers backfire during heatwaves
When faced with high external temperatures, the body increases blood flow to the skin and produces sweat to cool itself through evaporation. But stepping into a freezing shower reverses this natural process. As the researchers explain, “when taking a chilly shower, blood vessels near your skin constrict, which reduces blood flow to certain areas, causing your body to hold heat in and around your organs.” This constriction of blood vessels can make it more difficult for heat to escape, effectively keeping the body hotter for longer despite the cold water.
Cold shock and cardiovascular risks
The real danger arises when extremely cold water shocks the system. The article from The Conversation warns that when water is “borderline freezing, a domino effect happens: your body goes into a ‘cold shock response.’” This reaction causes the skin’s blood vessels to rapidly constrict, significantly raising blood pressure as the heart is forced to work harder. This can be particularly dangerous for those with heart conditions. While rare, “the shocking difference in body temperature, going from hot to cold, can cause an irregular heartbeat and worst-case scenario can lead to death,” according to the researchers.
Safer ways to cool your body
Rather than risking health with an icy shower, experts recommend gentler methods to cool the body safely. A normal or lukewarm shower, cool damp towels applied to pulse points, or a mildly chilled bath can help lower core temperature gradually. Staying hydrated, avoiding alcohol and caffeine, and wearing breathable light-coloured clothing are also essential during heatwaves. These strategies support the body’s natural cooling mechanisms without triggering adverse responses.
Smart cooling tips for your home
Keeping your home cool during a heatwave is just as important as cooling your body. Energy expert Les Roberts told the Daily Mail that fans should be pointed outward toward open windows. “Opening opposite windows or doors allows air to flow through,” he explained. “For even better airflow, you can place a second fan facing inward at the opposite opening to pull cooler air into the room, creating a strong cross-breeze.” This not only improves indoor air circulation but also reduces reliance on energy-intensive air conditioners.