Beyond Fatigue Top Cardiologist Warns How Prolonged Heatwaves Dehydrate and Damage Your Heart

As intense heatwaves continue to sweep across several parts of India, top medical experts are warning that extreme temperatures pose a far more sinister threat than simple exhaustion, sluggishness, or dehydration. Dr. Purshotam Lal, a renowned interventional cardiologist and Chairman of Metro Group of Hospitals, has issued a critical advisory highlighting that prolonged exposure to extreme heat can directly damage cardiovascular health. The cardiologist explained that when ambient temperatures skyrocket, the body works overtime to cool itself by dilating blood vessels and pumping blood rapidly toward the skin. This excessive strain dramatically accelerates the heart rate, forces the heart muscle to work exponentially harder, and causes a sharp drop in blood pressure that can trigger sudden dizziness, fainting spells, or heat exhaustion.

The cardiovascular risk amplifies drastically for vulnerable demographics, including the elderly, individuals with pre-existing heart conditions, and those managing chronic illnesses like diabetes or hypertension. Dr. Lal noted that severe dehydration leads to hemoconcentration—a condition where the blood loses water volume, becomes thicker and more viscous, and forms a high-risk environment for blood clots that can trigger acute heart attacks or strokes. To mitigate these life-threatening risks during peak summer intervals, the medical expert strongly advises individuals to stay strictly hydrated by consuming ample water, buttermilk, or electrolyte fluids, avoid strenuous outdoor physical activities during peak sunshine hours (11:00 AM to 4:00 PM), wear light, breathable clothing, and seek immediate medical attention if they experience red-flag symptoms such as chest pain, shortness of breath, heavy palpitations, or severe lightheadedness.