Chronic disease patients in South Korea, particularly those with diabetes, face increased blood sugar volatility during extreme summer heatwaves [1, 2].

These fluctuations are critical because they can lead to severe medical emergencies. When the body struggles to regulate temperature and hydration, the resulting metabolic stress can destabilize glucose levels, making routine management more difficult for patients.

Medical reports indicate that excessive sweating and dehydration during heatwaves cause blood to become concentrated [1, 2]. This process, combined with an increase in stress hormones, can cause blood sugar levels to rise sharply [1, 2].

Conversely, the extreme heat often leads to a decrease in appetite [1, 2]. Patients who skip meals due to the heat face a heightened risk of hypoglycemia, or dangerously low blood sugar [1, 2].

Health officials are advising patients to be cautious about the types of fluids they consume to stay hydrated. While water is preferred, many common summer beverages contain high levels of sugar that can further destabilize glucose levels [1, 2].

"Fruits, as well as carbonated drinks, fruit juices, and sweet coffee, contain sugars and should be consumed with caution," a YTN reporter said [1, 2].

Patients are encouraged to monitor their levels more frequently during temperature spikes. Proper hydration and consistent meal timing are essential to prevent the dual threats of hyperglycemia and hypoglycemia during the summer months [1, 2].

"When the hot summer arrives with constant sweating, those with chronic diseases such as hypertension and diabetes need to be even more careful," an anchor said [1, 2].

“Excessive sweating and dehydration can cause blood to become concentrated and stress hormones to increase.”

The intersection of extreme weather and chronic health management creates a volatile environment for diabetic patients. Because heat affects both the hormonal response and the physical concentration of blood, standard medication dosages may not suffice without strict dietary and hydration adjustments. This highlights the growing need for climate-specific medical guidance as heatwaves become more frequent.