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Thai people gather to pray for sick king
01:49 - Source: CNN

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Doctors said King Bhumibol Adulyadej's condition was "unstable"

He underwent a series of medical procedures over the weekend

Bangkok CNN  — 

Well-wishers in Thailand are praying for the health of their beloved King, Bhumibol Adulyadej, who has been hospitalized and is in an “unstable” condition, according to the palace.

The 88-year-old, who ascended to the throne 70 years ago – making him the world’s longest-reigning monarch – is being closely monitored after undergoing medical procedures over the weekend.

Thais wearing pink shirts are saying prayers at their local temples and visiting the Siriraj hospital in Bangkok, where the King is being treated, according to images on social media.

Thais dress in lucky pink shirts for ailing King

Women hold portraits of Thai King Bhumibol Adulyadej as they pray for his health at Siriraj Hospital in Bangkok on October 12, 2016.

Messages of support have been flooding onto social media sites including Facebook.

Doctors at the Siriraj hospital in Bangkok said that the King was having problems with his kidneys, blood flow to the left side of his heart and blood pressure.

People pray during special prayers for Thai King Bhumibol Adulyadej at Wat Pathumwanaram temple on Monday, October 10, 2016 in Bangkok.

He was also put on a ventilator and his general condition “remains unstable,” according to the statement from the Bureau of the Royal Household which was posted on the King’s official Facebook page on Sunday.

Concerns for the highly revered King have been mounting in recent years due to his extended hospital stays.

Last month, he was treated for a severe infection, reduced kidney function and fluid in his lung. He had surgery to remove his gallbladder last year.

Lauren Said-Moorhouse contributed to this report from London.