The Thai king’s eldest daughter has been hospitalized with a heart condition after she lost consciousness, the royal palace said.
Princess Bajrakitiyabha, 44, lost consciousness while attending a working dog championship organized by the army in the northeastern province of Nakhon Ratchasima on Wednesday.
The princess was treated at a local hospital and was flown by helicopter to Bangkok after her condition stabilized at a certain level, the palace said in a statement on Thursday.
She was being treated at Chulalongkorn Hospital in Bangkok where she was undergoing treatment and checks on her condition, he added.
The princess is one of three children of King Vajiralongkorn who have official titles, making her eligible for the throne under a 1924 law of succession.
While King Vajiralongkorn has yet to officially designate an heir since becoming monarch in 2016 and there has been no official discussion of the prospect of the princess taking the throne, she is widely considered a suitable successor.
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The Princess has worked with the United Nations and served as Thailandambassador to Austria, Slovenia and Slovakia.