Eleven people died and 5,664 people were taken to hospitals in Japan due to heat-related medical issues last week when temperatures rose sharply following the end of the rainy season in most areas, the government said Tuesday.

The number of people sent to hospitals nearly tripled from 1,948 in the preceding week. Those age 65 and older accounted for 52.6 percent of the total in the week to last Sunday, according to the Fire and Disaster Management Agency.

Of the 5,664 people, 119 displayed severe symptoms that would normally require at least three weeks of treatment as an inpatient, while 1,792 suffered less serious issues, necessitating shorter stays.