As global temperatures continue to rise, extreme heat is emerging as a major public health concern across many regions of the world. Prolonged heatwaves are no longer viewed as temporary seasonal discomforts but as serious health emergencies capable of affecting nearly every organ system in the body. Medical experts warn that excessive heat exposure can trigger dehydration, exhaustion, cardiovascular stress, kidney injury, and potentially life-threatening conditions such as heatstroke, particularly among vulnerable populations.
The human body relies on several natural mechanisms to regulate internal temperature, including sweating, increased blood flow to the skin, and careful fluid balance control. However, during periods of extreme heat and high humidity, these systems can become overwhelmed. High humidity further intensifies the risk because sweat evaporates less efficiently, reducing the body’s ability to cool itself naturally.
Doctors explain that dehydration is often one of the earliest and most common consequences of prolonged heat exposure. Excessive sweating leads to significant loss of water and electrolytes, which are essential for maintaining normal cellular and organ function. Early symptoms may include intense thirst, dry mouth, fatigue, dizziness, headaches, muscle weakness, and dark-coloured urine. If not corrected promptly, severe dehydration can impair blood circulation and place dangerous strain on critical organs.
Heat exhaustion is another major concern during extreme weather conditions. This condition occurs when the body begins overheating but has not yet progressed to full heatstroke. Individuals may experience heavy sweating, nausea, rapid heartbeat, muscle cramps, weakness, confusion, and severe fatigue. Health experts caution that without timely intervention, heat exhaustion can rapidly escalate into heatstroke, a life-threatening medical emergency.
Medical experts identify several groups as particularly vulnerable during heatwaves, including older adults, infants and young children, pregnant women, outdoor labourers, individuals with obesity, and patients with diabetes, heart disease, or kidney disorders. Certain medications may also interfere with the body’s ability to regulate temperature effectively, increasing the risk of heat-related illness. To reduce the health risks associated with extreme heat, doctors recommend maintaining regular fluid intake throughout the day, avoiding direct sun exposure during peak afternoon hours, wearing lightweight and breathable clothing, and seeking cool or air-conditioned environments whenever possible. Individuals engaging in outdoor activities are advised to take frequent hydration breaks and avoid strenuous exertion during the hottest parts of the day. Experts also caution that alcohol and excessive caffeine consumption may worsen dehydration. As climate-related heat events become increasingly frequent and intense, healthcare professionals emphasise the importance of recognising early warning signs and acting quickly to prevent serious complications. Public awareness, preventive measures, and timely medical attention remain critical in protecting communities from the growing health dangers associated with extreme heat exposure.
By
HB Team
