Crown Princess Masako's health could easily worsen due to fatigue, the head of the Crown Prince's household said, quoting a statement released by her medical team.

The Crown Princess, 48, is "in a situation where her health condition can easily worsen due to accumulated fatigue," said the statement disclosed Friday by grand master Kyoji Komachi. The Crown Princess began suffering from a stress-induced illness shortly after entering the Imperial family.

But Komachi added that the diagnosis "does not mean the Crown Princess' condition is getting worse." Her medical team said the Crown Princess should take sufficient rest before slowly expanding her activities beyond private affairs.

Komachi released the statement after telling a news conference last month that the Crown Princess' health is unstable, stirring a media controversy due mainly to a lack of detail.