Auckland Mayor Phil Goff is in hospital after an unscheduled surgery.

The 64-year-old politician had an angioplasty in a public hospital this weekend.

An angioplasty is a procedure in which a narrowed section of the coronary artery is widened to increase blood flow to the heart. It is less invasive than a bypass.

A mayoral spokesman said he had recovered well, but was expected to stay in hospital for another day or two before returning to work on April 23.

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Deputy Mayor Bill Cashmore will be stepping in for some of the mayor's duties during his absence.

Goff was elected Mayor of Auckland in 2016. Before that he had a long and distinguished career in Parliament as the Labour MP for Mt Roskill, served as Leader of the Opposition between 2008 and 2011 and held a number of senior Cabinet positions.