An agency official says that the 78-year-old Emperor was admitted to University of Tokyo Hospital on Saturday for testing, but that the visit was not an emergency.
His Imperial Majesty Emperor Akihito has had various health problems in recent years, including pneumonia and prostate cancer. He has cut back on public duties but appears relatively healthy.
According to Kyodo News agency, the Emperor will get tests for his heart, which may be suffering from a deficient blood supply.
Source: Associated Press