Expert Warning: Cold Showers During Extreme Heat Pose Deadly Health Risks
Heat Wave Warning: Why Cold Showers Could Be Dangerous
(Include image: Map of US heat dome with caption: "A massive heat dome traps hot, humid air over half the US in June.")
The first major summer heat wave has engulfed millions in scorching temperatures, sending cities into triple-digit highs. While many rush to cool off, experts warn that cold showers could pose fatal risks, particularly for those with heart conditions.
Professor Adam Taylor of Lancaster University explains that plunging into cold water during extreme heat reduces the body’s ability to shed heat. Instead of cooling you down, cold water triggers blood vessels near the skin to constrict, trapping heat around vital organs. This shock response can spike blood pressure and strain the heart, raising risks of irregular heartbeats or organ damage in vulnerable individuals.
How the Body Cools Naturally
The body’s core temperature is optimally 98.6°F. When overheated, the brain signals blood vessels to widen, redirecting warm blood to the skin’s surface. About 60% of heat escapes through thermal radiation, while sweating accounts for 22%. In extreme heat, sweating becomes crucial, but high humidity can hinder evaporation.
(Include image: Person sweating, caption: "Sweating is key to cooling, but cold showers disrupt this process.")
Why Cold Showers Backfire
Cold showers trigger a “cold shock response,” causing blood vessels to tighten and reducing heat release. This tricks the body into conserving heat instead of expelling it. Water below 59°F may abruptly raise heart rate and blood pressure, risking cardiac events. While rare, sudden temperature shifts (like jumping into cold water post-heat) can be deadly for those with heart disease.
Lukewarm Is the Solution
Studies suggest tepid showers (78.8–80.6°F) optimally cool the body. Unlike cold water, lukewarm temperatures allow blood flow to the skin without shocking the system. If opting for colder water, gradually adjust the temperature to avoid stressing your body.
Skin and Hygiene Risks
Cold showers also fail to cleanse effectively. Sweat, sebum, and bacteria mix on hot days, causing odor. Cold water doesn’t dissolve oils as well, leaving pores clogged and raising risks of acne. Warm water better removes grime without overheating.
(Include image: Shower with thermometer, caption: "Lukewarm showers clean skin without trapping heat.")
Stay Safe in the Heat
- Avoid drastic temperature shifts; start with lukewarm showers.
- Stay hydrated and seek shade.
- Monitor high-risk individuals for heat exhaustion signs (dizziness, nausea).
While ice baths trend online, they’re ill-advised during heatwaves. Stick to gradual cooling to protect your heart and skin.
Adapted from The Conversation. Adam Taylor is a Professor of Anatomy at Lancaster University.
