Michael Bublé felt like 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 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… And you know what, hell seems like a really nice place to vacation compared to where we've been."