Kanye West has reportedly been admitted to hospital for exhaustion, a day after cancelling his tour.
The rapper is being treated for sleep deprivation in Los Angeles after police were called to reports of a disturbance on Monday, People magazine reported.
A source told the magazine: "He is exhausted and currently dealing with sleep deprivation.
"He went to the hospital at will under the advice of his physician. He's fine."
The source added that Kanye was not restrained and that "he went freely" to hospital.
The Los Angeles Police Department confirmed it responded to a report of a disturbance but the incident was deemed a "medical emergency".
A Los Angeles Fire Department spokesman said: "At 1.20pm, the Los Angeles Fire Department responded to an unspecified medical aid request in the 900 block of North Laurel Avenue.
"An adult male described as medically stable was taken to an area hospital for assessment."
Kanye's wife Kim Kardashian was expected to appear at the Angel Ball in New York City on Monday but did not attend. It would have marked her first public appearance since she was robbed in Paris in early October.
Kanye, 39, abruptly pulled the plug on his Saint Pablo Tour on Sunday following a series of onstage outbursts in recent days.
A spokesman for the music star confirmed his remaining 21 dates were no longer taking place but no reason was given for the cancellation.
Live Nation said fans with tickets for the cancelled shows would be refunded.
On Saturday, Kanye ended a concert after four songs in Sacramento, California, before cancelling a performance in Los Angeles a day later, just hours before he was due on stage.
His shortened show on Saturday involved a 10-minute rant about Beyonce, Jay Z, Hillary Clinton and Facebook founder Mark Zuckerberg.
On Friday, Kanye had told concert-goers that he would have voted for Donald Trump in the US presidential election had he decided to cast a ballot.
He also praised the president-elect's "method of communication" as "very futuristic". Angry fans booed Kanye and threw items on stage following his comments.