Motley Crue frontman Vince Neil was rushed to the hospital on March 10, his bandmates revealed on Twitter.
Neil, 52, fell ill with suspected kidney stones during a performance in Australia and had to be taken to the emergency room to receive care.
Nikki Sixx apologized to fans on the social media site, writing:
Motley Crue member Mick Mars also took to Twitter to apologize to concert-goers, explaining, "Vince had an attack of kidney stones. He went straight from stage to the hospital."
Motley Crue is currently touring Australia with fellow rockers Kiss and Thin Lizzy. The group was playing a second gig at Sydney's Allphones Arena when Neil started experiencing pain.