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Heatwaves have become increasingly common across India, with temperatures crossing 45°C in several regions. While most conversations around extreme heat focus on dehydration and heatstroke, its impact on heart health often goes unnoticed.
High temperatures force the cardiovascular system to work harder to regulate body temperature. For people living with hypertension, diabetes, obesity, or heart disease, this extra strain can increase the risk of serious complications, including heart attacks, irregular heartbeats, and fainting. The danger is that these warning signs often develop gradually and may be mistaken for simple fatigue or dehydration until they become a medical emergency.
The human body has its own cooling mechanism. When temperatures rise, blood vessels near the skin widen to release heat. This process, known as vasodilation, helps regulate body temperature and also changes how blood circulates. At the same time, excessive sweating leads to fluid and electrolyte loss. As blood volume falls, the heart must work harder to maintain circulation and deliver oxygen throughout the body. In healthy individuals, the body often compensates.
For those already carrying cardiovascular risk factors, however, the additional workload can become significant. Extreme heat can also trigger stress responses that increase heart rate and place further strain on the cardiovascular system. The result is a combination of dehydration, fluctuating blood pressure, and increased cardiac demand occurring simultaneously.
1. Heart – oxygen mismatch: The extreme workload increases the heart’s oxygen demand. In individuals with blocked arteries, this supply-demand mismatch can precipitate a heart attack.
2. Blood pressure fluctuations and fainting: Extreme heat can cause blood pressure to become unstable. Some people experience sudden drops because of dehydration and widened blood vessels, leading to dizziness, weakness, or fainting. Others may develop temporary spikes due to physical stress, poor hydration, or electrolyte imbalance.
3. Blood clotting: Dehydration concentrates the blood, increasing its thickness and leading to the formation of blood clots, which can cause a stroke or heart attack.
4. Irregular heartbeats: Sweating causes the body to lose electrolytes such as sodium and potassium, which are essential for maintaining the heart’s normal electrical activity. Significant electrolyte imbalance can trigger abnormal heart rhythms (arrhythmias), particularly in people with existing heart conditions
Many people assume that hot weather naturally lowers blood pressure and therefore reduces cardiovascular risk. In reality, heat can make blood pressure less predictable.
Some individuals may develop low blood pressure because dehydration reduces blood volume, while others experience elevated readings due to physical stress and fluid imbalance. The real concern is not simply high or low blood pressure—it is sudden fluctuations that place additional stress on the cardiovascular system.
Another common mistake is altering medications during summer without consulting a doctor. Some people skip or reduce blood pressure medicines because they worry about dehydration or believe their condition has improved. However, stopping prescribed medication without medical advice can significantly increase the risk of complications.
Older adults remain a high-risk group, but they are no longer the only population of concern.
Outdoor workers, such as delivery personnel, drivers, and construction workers, as well as individuals who spend long hours commuting, are increasingly exposed to prolonged heat stress. Many continue working through peak afternoon temperatures with limited opportunities for hydration or rest. There is also a growing group of working professionals who may not appear vulnerable at first glance.
Long work hours, poor sleep, irregular eating habits, chronic stress, and limited physical activity often coexist with undiagnosed hypertension, obesity, or diabetes. These individuals may feel healthy enough to ignore routine screening. Yet, they carry silent cardiovascular risk that can become more pronounced during periods of extreme heat.
Seek immediate medical attention if you or someone around you experiences:
Ignoring these warning signs can delay treatment and increase the risk of life-threatening complications.
Take a PollTake a PollPublic health messaging during summer often begins and ends with one recommendation: drink more water. While staying hydrated is essential, it is just one aspect of an effective preventive program. Effective prevention of cardiovascular-related problems involves regularly monitoring individuals’ blood pressure, taking prescribed medications as needed, recognising the signs and symptoms of cardiovascular conditions, and undergoing timely screening for cardiovascular risk factors.
As heatwaves become more frequent and intense, they need to be viewed as a recurring health challenge rather than a seasonal inconvenience. A few practical measures can go a long way in reducing cardiovascular risk:
As temperatures continue to rise, protecting heart health will require more than seasonal precautions. Small, consistent actions can help reduce the hidden cardiovascular risks that often surface only when it is too late.
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