Kanye West hospitalized and handcuffed....

Kanye West has been taken to UCLA Medical Center for psychiatric evaluation.

According to law enforcement sources ... cops responded to a call for a welfare check on Kanye around 1:20 PM PT. He was at his trainer, Harley Pasternak's home at the time and was "acting erratically."

The hospitalization comes on the heels of Kanye abruptly cancelling the remainder of his Saint Pablo Tour, and launching into a verbal attack on Jay Z and Beyonce.

Reports indicate that the police called L.A. Fire, and by the time paramedics arrived Kanye was calmer ... but still resistant to going to the hospital. Everyone -- his management and law enforcement -- convinced him it was best he go. Law enforcement sources tell report that Kanye was handcuffed to a gurney during transport to the hospital ... as standard protocol.


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