Why Summer Is a High-Risk Season for Lifestyle Diseases, Doctor Explains

Summer once meant holidays, mangoes, and long leisurely evenings. However, today it has become a season of intense physiological stress that quietly triggers some of the most common and dangerous lifestyle diseases. As temperatures rise year on year and heatwaves become more intense, the season is no longer just uncomfortable but hazardous.

Heat and Blood Sugar: A Dangerous Combination

According to Dr Tushar Tayal, Associate Director, Internal Medicine, CK Birla Hospital, Gurugram, “For people with diabetes or prediabetes, summer is a minefield. High ambient temperatures cause blood vessels to dilate and circulation to shift, which changes how quickly insulin is absorbed from injection sites, making blood sugar management unpredictable. Heat also degrades insulin if it is not stored correctly, a practical risk that often goes unnoticed.”

Additionally, heat also triggers the release of cortisol and other stress hormones that directly increase blood glucose levels.

NOTE: In non-diabetics, repeated heat-induced cortisol spikes over weeks can worsen insulin resistance.

Also Read: 7 Common Summer Diseases In India You Need To Watch Out For

Dehydration and Cardiovascular Strain

The heart works significantly harder in summer. To cool the body, blood is redirected to the skin's surface, forcing the heart to pump more frequently. For anyone with underlying cardiovascular disease or even undiagnosed hypertension, this increased blood supply demand can increase the risk of a cardiovascular issue.

Dehydration compounds the problem.

• As the body loses fluid through sweat, blood thickens and becomes more prone to clotting.
• Blood pressure becomes harder to regulate.
• The kidneys, already under stress, work overtime to conserve water while filtering the concentrated blood.

NOTE: This is one of the main reasons for increased hospital admissions for kidney stones, Urinary Tract Infections (UTI), and acute kidney injury in the summer months across South Asian countries.

Also Read: Kidney Stones in Summer: Causes, Risks, and Prevention Tips

Lifestyle Disruption: The Hidden Risk

Perhaps the most underestimated danger of summer is what it does to healthy habits.
Intense heat discourages outdoor activity, pushing people toward prolonged sitting. According to a 2025 study published in ‘Dovepress’, sleep quality deteriorates, and poor sleep raises appetite hormones, increases cravings for high-calorie food, worsens blood sugar regulation, and elevates cardiovascular risk.

Final Word

Lifestyle diseases, diabetes, hypertension, obesity, and cardiovascular disease are not static. They worsen under conditions of sustained physiological stress, and summer in a warming world now reliably delivers exactly that. The season amplifies every existing vulnerability. Staying hydrated, protecting sleep, maintaining some form of indoor physical activity, and monitoring known health conditions more closely during peak heat months are not seasonal luxuries. They are, increasingly, medical necessities.