Lady Gaga Struck Down With Altitude Sickness

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August 7, 2014 | 7:27am EST

Pop star Lady Gaga fell ill in Denver, Colorado on Wednesday night when she was hit with a bout of altitude sickness.
The Born This Way hitmaker brought her artRAVE: The ARTPOP Ball world tour to the city’s Pepsi Center on Wednesday night but the city’s high elevation took its toll on the singer.After the show, Gaga posted a picture of herself breathing through an oxygen mask on photo-sharing site, writing in the caption, “Altitude sickness is no joke! #hitThatHospitalSh**t #artRaveDenver many true ravers crowd tonight.”
Denver is located on the edge of Colorado’s High Plains and is nicknamed the Mile-High City because it is exactly a mile above sea-level.