Fresh concerns over Thailand's King Bhumibol's health 22 November 2014 Last updated at 11:24 King Bhumibol Adulyadej of Thailand has failed to appear for a scheduled event, raising fresh concern about his health. On Friday, the 86-year-old monarch was due to preside over the confirmation of two ministers appointed by PM Prayuth Chan-ocha, a former general who seized power in a coup in May. However the ministers were told that King Bhumibol was unable to meet them. The ailing king has been staying at a hospital in Bangkok following an operation last month. His health is a sensitive issue in Thailand. Any discussion about the royal succession is tightly constrained by a stringent lese-majeste law. Bhumibol, the world's longest-reigning monarch, has been on the throne for 67 years. The BBC's Jonathan Head in Bangkok says he is accorded a revered status that is considered vital to the country's stability. Gen Prayuth Chan-ocha was appointed prime minister by the military-appointed parliament in August.