A media outlet in Switzerland reported that Rihanna was rushed to the hospital Monday night after performing a sold-out show in Zurich.
According to Swiss news provider Blick, the singer was taken from the Hallenstadion venue to the Hirslanden private clinic in a blacked-out Mercedes after midnight.
She was reportedly treated for an unknown condition before leaving the hospital at around 2:55 a.m., when she was taken back to the venue.