57 people have been killed in a heatwave in Japan since July 29, the government said Tuesday with more than three times the number of victims taken to hospital.
The number received treatment increased from 5,664 the previous week to 18,347.
According to the Disaster Management Agency, the number sent to the hospital is the second highest since 2008.
Of the 18,347 who received treatment, 729 had severe symptoms requiring more than three weeks of treatment while 6,548 had mild symptoms and were treated for several days. Victims aged 65 and above account for 54.3 percent of the overall patient population.
The capital said many patients received hospital care of 1,857 people followed by Aichi district (1,342 people) and Saitama (1,307 people).
Deaths were reported across 24 districts with Hokkaido recording seven cases (highest) while five were in Ibaraki and Saitama.
The agency said the high pressure on the Japanese islands protected the extreme weather as it advised people to stay hydrated and rest in cooler places.