The pop star shared this hospital selfie on her Instagram page last night with the caption "Altitude Sickness is no Joke! #hitThatHospitalS**t #artRaveDenver many true ravers crowd tonight."
The pop star has been traveling around the world on a private jet for her artRave tour and fortunately has a day off before she has to perform in Seattle on Friday night.
She is right, though, altitude sickness is no joke. In fact, in severe cases, people can even die from it.
Of course, her dedicated fans have already started a #GetWellSoonGaga hashtag on Twitter, with many worried Little Monsters pointing out that she's been sick for awhile, even vomiting on stage twice in Salt Lake City earlier this week.
The good news is that Mother Monster seems to have a pretty mild case of the malady and she's hopefully already well on her way to feeling better.
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Gallery | Lady Gaga's Style