There are concerns in Thailand for the health of the King’s daughter, HRH Princess Bajrakitiyabha Narendira Debyavati. In an announcement at around 4pm local time on 15 December, the Palace announced that the princess “fell unconscious due to a heart condition”. The 44-year-old princess collapsed while outside with her dog on a trip to Khao Yai in north-east Thailand. Channel News Asia (CNA) report that the King’s daughter had been training her dog in the north-east province of Nakhon Ratchasima in preparation for the Thailand Working Dog Championship by Royal Thai Army 2022 event.
CNA also report that the Thai royal received medical treatment at Pak Chong Nana Hospital in Nakhon Ratchasima before being transferred by helicopter to Chulalongkorn Hospital in Bangkok.
Princess Bajrakitiyabha is the eldest child of King Vajiralongkorn (Rama X). Her mother was Princess Soamsawali who the King married in 1977 when he was crown prince. The marriage ended in divorce in 1991.

(Photo: Dean Calma / IAEA used here under Creative Commons agreement)
The princess was born at Dusit Palace in Bangkok on 7 December 1978 and educated in Thailand and England. Also known in Thailand by her nicknames of Princess ‘Pa’ or ‘Patty’, she is the first grandchild of King Bhumibol and Queen Sirikit of Thailand.