Singer Amy Winehouse has cancelled a series of European shows after being admitted to hospital suffering from "severe exhaustion".
The singer has cancelled a string of gigs in the past
The 23-year-old singer was taken to University College London Hospital on Wednesday morning and later discharged.
Organisers of Norway's Oya Festival, where she was due to play, said that she cancelled without explanation.
A spokesman for Winehouse's record label, Island, said the singer had "been advised to take complete rest".
Other concerts in Norway and Denmark have also been pulled.
A message on the Oya festival website said: "The news of the cancellation came abruptly and surprisingly upon us a little before one o'clock this afternoon.
"Winehouse's large crew arrived yesterday, and her backing band had just finished their sound check when we were notified.
"So far no reason has been stated. We will be back with more news as soon as we have been informed."
The set is a latest in a string of gigs the singer has recently cancelled, citing exhaustion or ill health.
In the past few weeks she has pulled out of the T in the Park festival - also citing "exhaustion" - and Liverpool's Summer Pops event.
The singer has put her habit of cancellations down to being a perfectionist.
"I know it's last-minute and a bit irresponsible. But I'm a perfectionist and would rather reschedule a show than do it half-heartedly," she said in a recent interview.
On Tuesday, Winehouse received three nominations at the MTV Video Music Awards, including Female Artist of the Year.