He said around 30 victims already had chronic diseases, with most of them falling within the age range of 50 to 90 years.

The incidence of heatstroke increased dramatically in Myanmar amid a heat wave in April this year. He said that in March, the number of heat-related cases requiring hospitalization was only eight, but increased to more than 50 by April.

April 28 was Mandalay's hottest April day in 77 years, when the temperature reached 44.8 degrees Celsius, according to the country's Department of Meteorology and Hydrology.

In the Southeast Asian country, April and May are generally the hottest months as temperatures rise before the onset of the monsoon season.