Health experts warn of heat-related risks to heart, kidneys, and vision

Medical experts are issuing warnings regarding the physiological impacts of extreme summer heat on various bodily systems. Key concerns include heat exhaustion, cardiovascular strain, and kidney health.

Regarding heat exhaustion, WebMD and Mayo Clinic note that subtle symptoms like blurred vision—caused by dehydration and reduced blood flow to the eyes—can precede more severe signs like fainting. Sudden, disproportionate fatigue is also a critical warning sign that should not be dismissed as mere summer tiredness.

Cardiovascular health is at risk as the body attempts to regulate temperature through vasodilation, which can lead to sudden drops in blood pressure (hypotension). Conversely, dehydration can thicken the blood, increasing the risk of heart attacks and strokes. Experts recommend monitoring blood pressure and maintaining electrolyte balance.

Kidney health is also threatened by fluid loss. Specialists warn that waiting until one feels thirsty is a mistake, as thirst indicates dehydration has already begun. Dehydration can lead to concentrated urine and the formation of kidney stones. To mitigate these risks, doctors advise consuming 2.5 to 3 liters of water daily, avoiding excessive salt and caffeine, and eating seasonal, water-rich fruits and vegetables.

Additionally, extreme heat and humidity can exacerbate conditions such as sinusitis due to rapid temperature shifts between outdoor heat and air-conditioned environments. For those with chronic conditions like rheumatism, experts suggest maintaining mobility through low-impact exercises like swimming during cooler hours.