After performing at the Pepsi Center in Denver, Colorado on Wednesday, Lady Gaga was hospitalized for altitude sickness.Altitude sickness is common in people who travel to areas that are higher above sea level than what they are used to.

The symptoms of altitude sickness include anorexia, nausea or vomiting; fatigue or weakness; dizziness or lightheadedness; and difficulty sleeping and most people feel like they are coming down with a cold before they realize there is something else going on.

Altitude Sickness is no Joke! #hitThatHospitalShit #artRaveDenver many true ravers crowd tonight http://t.co/0mX407Xews

— Lady Gaga (@ladygaga) August 7, 2014

Gaga went to a Denver hospital and was admitted for treatment. She posted a photo of herself with an oxygen mask of Instagram and said, “Altitude Sickness is no Joke,” in the caption.

In spite of the sickness, Lady Gaga’s show in Seattle on Friday went on as planned and Gaga seems to be doing much better.

Altitude sickness is treated with oxygen, rest, and fluids and doctors often advise sufferers to rest often, avoid drinking too much alcohol, drink plenty of water and avoid a lot of physical activity.

Gaga could experience the symptoms again if she does not follow the doctor’s orders and may not be able to continue her tour if she is unable to overcome the sickness.

Ok SEATTLE THERE IS NO TURNING BACK I'm here, feeling great, and ready to throw the RAVE U DESERVE!

— Lady Gaga (@ladygaga) August 9, 2014

In spite of the illness, Gaga was able to make it on to Seattle where she performed for the audience, who had been nervous that the show would be canceled.

The last stop on her North American tour was Vancouver, where she performed on Saturday.

The LAST artRAVE for the North American Leg is tonight in Vancouver! Trend it! #artRAVEVancouver let me see your outfits and #monsterstyle

— Lady Gaga (@ladygaga) August 10, 2014

@ladygaga #artRAVEVancouver Tonight! #MTVHottest Lady Gaga http://t.co/e6XS7G1EHW

— Lady Gaga † Emmy (@EmmyARTPOP) August 9, 2014

Image via Wikimedia Commons