Emperor Naruhito has been found to have an enlarged prostate but there is no cause for concern, the Imperial Household Agency said Thursday.
The 62-year-old underwent a health examination on Sunday after the agency announced in early October that his prostate-specific antigen level, a tumor marker, was slightly higher than normal and "showing a slightly worrying movement."
The emperor will undergo a tissue examination later this month for confirmation, the agency said.
He has no symptoms and is scheduled to visit Hyogo Prefecture for an official event this weekend.
In 2007, the emperor had endoscopic surgery to remove a benign duodenal polyp, but he has not had any other medical problems.