Heatwave, low pressure system trigger widespread health symptoms in Hanoi

Temperatures in the Red River Delta and north-central Vietnam have reached 37-38 degrees Celsius during the mid-afternoon, according to meteorological data.

A low-pressure zone centered over Hanoi, measuring 996 hPa, has intensified heat retention in the area, pushing the perceived temperature to as high as 45 degrees Celsius.

Unlike previous heatwaves, residents have reported symptoms even without prolonged sun exposure.

“I’ve had to stop working because of constant dizziness and headaches, even though I avoid peak sun hours,” said Bui Van Hong, a 30-year-old construction worker in Hanoi.

Office workers have also reported similar symptoms, including muscle aches.

Dr. Doan Du Manh of the Vietnam Vascular Disease Association said the combination of high heat and low pressure can cause reduced blood pressure, headaches, and dizziness.

He also warned that abrupt temperature changes when entering or exiting air-conditioned spaces can increase the risk of thermal shock.

Associate Professor Nguyen Van Chi of Bach Mai Hospital’s emergency department said prolonged heat exposure can overload the body’s temperature regulation system.

If internal temperature exceeds 41 degrees Celsius, it may lead to heatstroke, seizures, or damage to the brain, heart, and kidneys.

Health experts warned that vulnerable groups — including outdoor laborers, children, the elderly, and people with chronic conditions — face higher risk during the heatwave.

Authorities advise avoiding outdoor activity between 11:00 am and 3:00 pm, drinking 2.5–3 liters of water daily, wearing protective clothing, and resting frequently.

In case of heatstroke, individuals should be moved to a cool place, their bodies cooled with wet cloths or fans, and emergency services contacted immediately.