The singer Morrissey is being treated for "physical exhaustion" after cancelling two concerts in the US.
A statement posted to his Instagram account said the singer had "been ordered to rest for two weeks".
It added that the former frontman of The Smiths would remain in Zurich where he was receiving "medical supervision".
Morrissey, 64, had been due to perform in California on 26 and 27 January to mark the 20th anniversary of his album, You are the Quarry.
The album features some of Morrissey's most famous songs including First of the Gang to Die and Irish Blood, English Heart.
The venues in Anaheim and Inglewood said the concerts had been cancelled due to "unforeseen circumstances".
His tour dates in February have also been cancelled, according to his website.
The singer had been due to perform in Mexico, Peru, Colombia, Chile, Argentina and Brazil next month.
The band She Wants Revenge, who were due to support Morrissey at the California shows, said they were "genuinely saddened".
They added that although they were "frustrated and deeply disappointed" they were "not terribly surprised".
"We all knew this was a possibility, we just hoped it would play out different this time", the band said.
Morrissey has previously cancelled shows due to ill health.