The Florence And The Machine singer, 36, posted on Instagram on Sunday to say she "had to have emergency surgery for reasons I don't really feel strong enough to tell you yet".

"It saved my life," she added.

It comes six days after she revealed an X-ray had shown she was "dancing on a broken foot" and had to cancel her appearances at Rock en Seine in Paris and the Zurich Open Air Festival.

She originally broke her foot during a performance at the O2 Arena in London in November and had to postpone tour dates, leaving her "heartbroken".

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In her most recent post, she promised she would honour her final two Dance Fever tour dates in Lisbon and Malaga in September.

But she added: "Maybe not jumping so much but you can do that for me."

Welch - whose band's hits include Shake It Out and Dog Days Are Over - previously cancelled a pair of festival gigs in 2012 to avoid permanently damaging her voice.

The singer said she had felt something "snap", describing the ordeal as "frightening".