The singer admitted that the routines she performs during her 'Born This Way Ball' tour make her physically sick as they are so gruelling.
"Yes Tokyo! Tonight was the first BtwBall that I didn't puke during show. (yes its that hard) (sic)," GaGa told her fans on Twitter.
She later added: "Tonight was happiness, joy, gratitude. I'm the lucky one Japan. You are so special."
Lady GaGa will take her 'Born This Way Ball' to the UK on September 8, playing three dates in total. The star has yet to announce the North American leg of the world tour.
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Watch the music video for Lady GaGa's 'Judas' below: