Sam Smith has said his recent throat operation was a "massive blessing in disguise".

"It was a worry just because I hate cancelling shows and disappointing people and that was horrible, but in terms of my health and my voice it was actually a massive blessing in disguise," he told Radio 2's Ken Bruce.

"I went to the throat doctor who looked after Adele and saved Julie Andrews' voice and I was in really good hands.

"So I never doubted that my voice would come back, it was just the pain of having to reschedule stuff."

"And even now it's just changed the way I feel about my voice. I'm a bit more scared than normal which is a good thing I guess."

Smith is the latest star to perform on BBC Radio 2's In Concert at the BBC Radio Theatre in London.

The Stay With Me singer had to postpone a number of concerts earlier this year after doctors discovered bleeding in his throat.

He posted a message on his Instagram account, telling fans about he had to have surgery.

"I'm so gutted to be missing all of the shows and events I was meant to be playing at," he wrote.

"The doctors say I will be back in 6-8 weeks and I cannot wait to sing for you all soon."

Smith also commented on his slimmer frame.

"I lost weight, that's probably a good thing. I was really fat before. Trust me, I was fat," he said.

Radio 2 In Concert with Sam Smith will be available to view on BBC Red Button until Wednesday September 9.