"getting better. thanks for everyone pulling me thru tonight. best fans in the world. figuring out what happened. thanks for the love," Bieber tweeted.
People.com quoted Bieber's manager, Scooter Braun, as telling the audience at Thursday's concert the 19-year-old singer had been having trouble breathing all night.
"He got oxygen from emergency personnel. He insisted on finishing the show," his representative told E! News after the concert. "He is on the way to the hospital right now."