Grant Denyer broke down in tears as he bravely discussed his struggles with his mental health in a candid new interview.

The TV star, 46, opened up about how he contemplated suicide after breaking his back and becoming addicted to painkillers in one of the darkest periods of his life.

Speaking to the Hit Network's Carrie Bickmore and Tommy Little on Thursday, the former Sunrise weatherman was overcome with emotion as he recalled his struggles.

Grant - who shares daughters Sailor, 10, Scout, six, and Sunday, two, with his wife Chezzi - revealed his family were his only 'purpose' during the very difficult time.

His voice shaking with emotion, the Deal Or No Deal host bravely shared: 'If I didn't have a… uh… a child at that time, I didn't really see much purpose in going on really.

Grant Denyer broke down in tears as he bravely discussed his struggles with his mental health in a candid new interview

Grant Denyer broke down in tears as he bravely discussed his struggles with his mental health in a candid new interview 

'I didn't have much fight left or will to go on… so it was for her. I didn't want [my daughter] to suffer the pain of not having a father around.'

Grant confessed he struggled with 'low self-worth' and didn't like himself at the time, but loved his daughter enough to work through the very dark period.

'Yeah… I could inflict pain on myself. I didn't view myself very favourably. I wasn't very kind. I had very low self-worth. I had no self-love. But I loved her enough to not want to hurt her,' he shared.

'If you just sort of put one foot in front of the other and just go bit by bit, just one rung at a time, you can kind of, you can get there.'

The TV star, 46, opened up about how he contemplated suicide after breaking his back and becoming addicted to painkillers in one of the darkest periods of his life

The TV star, 46, opened up about how he contemplated suicide after breaking his back and becoming addicted to painkillers in one of the darkest periods of his life 

Grant - who shares daughters Sailor, 10, Scout, six, and Sunday, two, with his wife Chezzi - revealed his family were his only 'purpose' during the very difficult time

Grant - who shares daughters Sailor, 10, Scout, six, and Sunday, two, with his wife Chezzi - revealed his family were his only 'purpose' during the very difficult time 

'Having trouble with pain meds after a broken back was the darkest period in my life,' he said during the Carrie and Tommy Show.

'I was winning races in Supercars, I was hosting things like Australia's Got Talent, Sunrise, and then bang - the handbrake gets pulled on your life and you have got to lie still for four months. 

'You go into your darkest worst nightmares everywhere every time you close your eyes. So just say your worst fear is either your wife leaving you or a home invasion, the moment you close your eyes, you go straight into those worst-case scenarios, every single night. 

'And when you wake up, you can't tell the difference between reality and your dreams. You believe they've all happened.' 

In 2014, Grant checked into a wellness centre in Thailand with his wife of 14 years Chezzi (both pictured) amid his struggles

In 2014, Grant checked into a wellness centre in Thailand with his wife of 14 years Chezzi (both pictured) amid his struggles 

Grant often discusses his mental health publicly, telling how he became addicted to pain medication after breaking his back in a freak monster truck accident in 2008

The crash left Grant with a vertebrae that was shattered in 11 pieces, and doctors feared he might never walk again.

In 2014, Grant attended a wellness centre in Thailand which specialises in the treatment of PTSD and exhaustion. 

'Going to Thailand was challenging, but it was the smartest thing [me and Chezzi] ever did,' he previously shared.

If you have been affected by this story, call Lifeline Australia on 13 11 14 or visit their website lifeline.org.au.