Michael Buble fears his son's post-cancer check-ups.

The 'Everything' hitmaker admits he gets nervous when his five-year-old son Noah, who is in remission from liver cancer after a devastating diagnosis two years ago, has to go for regular check ups as he also revealed the impact it has had on his family.

He said: "We have to take him every three months for check ups, and it's really scary ... One of the first things a doctor told me at one of the hospitals we'd gone to was to stay strong and help each other through this."

Michael Buble and son Noah sighting on April 28, 2015 in Madrid, Spain. Photo / Getty
Michael Buble and son Noah sighting on April 28, 2015 in Madrid, Spain. Photo / Getty

"When we had asked why the doctors keep telling us that, this friend of ours who works with families going through things like this, said that something like 92 per cent of couples who go through this ... get divorced. And many of the eight per cent who don't, have more children. And of course, my wife and I thought, here we are with a beautiful daughter."

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And Michael - who also has Elias, three, and Vida, seven months, with his wife Luisana Lopilato - doesn't know if either himself or his wife would be "brave" enough to fight it again.

He added to Allison Kugel: "We were in the car yesterday and I actually looked at her, and said, 'Would you do it all over again?' She then answered, 'Of course I would do it all over again. I wouldn't want anything different. You guys are the greatest joy of my life.' But then my question to her was, 'But would you be brave enough to do it all over again?' And then she said, 'I don't know.' And I would have to say the same thing. I don't know."