An extreme heatwave is currently on in many parts of the country, including the national capital, New Delhi, with experts raising concerns about subtle yet serious warning signs of heat-related illnesses. While waking up with a headache may seem like a minor discomfort, it could actually indicate the early stages of heat exhaustion. This condition can escalate into life-threatening heatstroke if ignored.
According to Dr. Anirban Chattopadhyay, Senior Consultant in Critical Care Medicine at CK Birla Hospitals, rising temperatures can significantly affect brain function. “The brain is highly temperature sensitive. When exposed to excessive heat, the body struggles to maintain its internal balance, leading to symptoms like headache, light-headedness, dizziness, and brain fog,” he explains.
During extreme heat, the body loses fluids rapidly through sweating, leading to dehydration and electrolyte imbalance. At the same time, changes in blood vessel behaviour – such as vasoconstriction - can disrupt blood flow to the brain. These combined effects can trigger headaches, especially upon waking.
“Dizziness and brain fog occur because the brain cannot tolerate high levels of heat,” Dr. Chattopadhyay adds. “These are early signs of heat stress and should not be ignored.”
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Heat exhaustion is the body’s response to prolonged exposure to high temperatures, particularly when combined with dehydration. If not treated promptly, it can progress to heatstroke - a severe condition where the body’s temperature regulation fails.
Heatstroke can lead to confusion, loss of consciousness, organ damage, and, in extreme cases, coma. Early recognition of symptoms like morning headaches, fatigue, and dizziness is crucial to prevent complications.
Repeated hot days and nights create a vicious cycle - poor sleep worsens mood and sleep cycle
Extreme heat doesn’t just affect your body; it also disrupts sleep and mental well-being. Dr. Arup Halder, Consultant Pulmonologist at CK Birla Hospitals, explains that hot nights interfere with the body’s ability to cool down, leading to poor sleep quality. “When the body cannot cool itself at night, it results in delayed sleep, frequent awakenings, and reduced deep sleep,” he says. Over time, this leads to fatigue, irritability, poor concentration, and emotional instability.
For those with pre-existing mental health conditions such as anxiety or depression, the effects can be more severe. Heat stress increases stress hormones, keeping the brain in a constant state of alertness. This creates a vicious cycle where poor sleep worsens mental health, and stress further disrupts sleep.
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