Lady Gaga is recovering in hospital after suffering from altitude sickness.

The Applause singer was admitted for medical care after falling ill following a concert in Denver, Colorado - where the elevation is one mile above sea level.

Gaga, 28, posted a selfie on Instagram which showed her in a hospital bed with an oxygen mask over her nose and mouth.

The Poker Face singer wrote: "Altitude Sickness is no Joke!

"#hitThatHospitalS**t #artRaveDenver many true ravers crowd tonight."

The star is currently on her ArtRave: The Artpop Ball tour.

Her next show, in Seattle, is expected to go ahead as planned.