Michael Bublé felt he was in ''hell'' during his son's cancer battle.

The 42-year-old singer disclosed his eldest son Noah's cancer diagnoses in a Facebook post in November 2016, and after 18 months of treatment, the four-year-old tot is making a steady recovery.

However, Michael - who has Noah, as well as two-year-old son Elias and a daughter on the way with his wife Luisana Lopilato - admits he finds the ordeal difficult to talk about, as he doesn't want his ''superhero'' son to ever ''relive'' his experience.

He said: ''I've been to hell. I don't talk about the whole story, not even to my friends because it hurts too much. It's my boy. He's a superhero, he doesn't need to relive it over and again. But I've been to hell. And you know what, hell seems like a really nice place to vacation compared to where we've been.''

The 'Haven't Met You Yet' hitmaker made a triumphant return to music over the weekend when he performed for 80,000 fans at Dublin's Croke Park stadium, but admits he ''never thought'' he'd ever get up on stage again.

He added: ''I truly thought I'd never come back to music. Family is what matters. The health of my children is number one. The relationship with my family, my wife, my faith - all of it is easily number one.''

Despite the ordeal his family have been through, Michael admits his son's cancer battle has put things into a new perspective for him.

Speaking to Australia's Herald Sun newspaper, he said: ''I live with a perspective that I just didn't have before and it allows me to have no fear.

''Perspective has allowed me to rekindle my love of music. When I went through Noah's cancer from the first moment there was a snap. I remember sitting in the hospital room thinking, 'I was worried about any of that s**t? I was worried about record sales or a meme or what some a**hole said about me?' In a second it had gotten so clear.

''That clarity gave me the opportunity to find love for music again. I'm going to go back to what I was made to do. I'm going to come back to a world that needs love and romance and laughter more than it has in a long time. I'm going to be a conduit to that. This is the greatest record I've ever made.''