The Born this Way hitmaker received medical care after suffering from altitude sickness following her gig in Denver, Colorado, on Wednesday night as part of her ArtRave: The Artpop Ball tour.
The 28-year-old singer shared a photograph of herself with an oxygen mask strapped over her mouth and nose on Instagram on Thursday, which she accompanied with the caption: "Altitude Sickness is no Joke! #hitThatHospitalShit #artRaveDenver many true ravers crowd tonight (sic)."
This isn't the first time Gaga has found herself in hospital recently as in April she underwent an operation to have her wisdom teeth extracted.
The star took to her Twitter account at the time to complain about her puffy face and lack of food following the painful procedure.
She tweeted: "Chipmunk Cheeks Wisdom Teeth out before tour. I can't eat. I'm gonna put some meatballs in a blender. (sic)".
Meanwhile, Gaga was recently informed her pet pooch Asia was unable to travel with her for the Far East leg of her tour later this month due to quarantine restrictions.
She tweeted earlier this week: "They won't let Asia into Asia. Some quarantine rules. I don't know what I'm going to do without my baby girl in Tokyo. I had so many plans!"