Poison lead singer Bret Michaels apologized to his fans after canceling a Nashville concert due to “unforeseen medical complications.”

“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,” the 59-year-old wrote on Instagram Friday.

“I send my deepest apologies for being unable to rock the stage tonight!!!” he continued. “I’m working on being back 100% very soon & hope you rocked hard with my friends Motley [Crüe]/[Def] Leppard/Joan [Jett & The Blackhearts] and Classless Act!!!”

He did not discuss whether or not he or the band will perform at their concerts scheduled for Saturday in Florida or Sunday in Mississippi.

It was reported that Michaels had a bad reaction to medication, which prompted his hospital visit.

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