Micheal posted on in instagram "To the incredible fans in Nashville, thank you for all your well wishes!! I was truly fired up to get on stage in the music city and perform, but due to an unknown complication & following hospitalization, it was not possible. I send my deepest apologies for being unable to rock the stage tonight!!! I'm working on being back 100% very soon & hope you rocked hard with my friends Motley/Leppard/Joan and Classless Act!!!"
Michaels, 59, has had health issues in the past. In 2010, he had a haemorrhage that required surgery and later that year he also underwent surgery to repair a hole in his heart.