The pursuit of relief during scorching heatwaves frequently causes a series of physiological missteps. [I] A primary spark for such events is thermal shock, often provoked by the abrupt transition between climate-controlled environments and harsh outdoor temperatures. These rapid transitions compel blood vessels to oscillate violently between constraint and expansion, a phenomenon exacerbated by the perilous habit of cold immersion immediately following heat exposure. Without a needed adjustment period, the body's inability to regulate its internal balance can trigger acute vasoconstriction, dizziness, or even fatal strokes. Similarly, hot showers in inadequately ventilated spaces can induce rapid vasodilation, causing blood pressure to plummet and leading to faint.

Physical exertion represents another critical vulnerability. [II] Undertaking high-intensity exercise, particularly on thermally saturated pavements during peak hours, subjects the respiratory and cardiovascular systems to intolerable strain. In these conditions, the body becomes a dual heater—absorbing ambient heat while simultaneously generating metabolic warmth—frequently resulting in arrhythmia or exertional heatstroke. Furthermore, the common desire for cooling down with alcoholic or carbonated beverages is a profound misconception. Alcohol acts as a potent vasodilator and diuretic, accelerating fluid loss while simultaneously dulling the perception of early warning signs like fatigue. [III] Excessive caffeine and sugar intake similarly exacerbate dehydration, undermining the body's cooling mechanisms.

Dietary choices further complicate these risks. High sodium intake promotes fluid retention and hypertension, placing immense stress on analytical and cardiac vasculature. [IV] Long-term adherence to diets rich in saturated fats and processed sugars accelerates atherosclerosis, progressively narrowing the arterial pathways. Crucially, when symptoms of heat distress manifest, the reliance on archaic folk remedies—such as "gua sha" or bloodletting—is dangerously misguided. These interventions fail to address the underlying physiological crisis and, more importantly, waste the "golden hour" essential for professional medical intervention. True mitigation requires a disciplined approach to gradual temperature transitions, thorough hydration, and a recognition that rhetoric regarding quick "cool-down" fixes must yield to evidence-based caution.

(Adapted from https://e.vnexpress.net)