Australian Idol winner Guy Sebastian has revealed he underwent major spinal surgery to treat severe nerve pain.

The 43-year-old singer shared a selfie from his hospital bed on Friday, showing him wearing a hospital gown and giving a thumbs-up, while opening up about his ongoing struggle.

“They say it comes in threes. There’s been a lot of highs this year but it’s also been a year where I’ve had to manage a LOT of physical pain,” Sebastian wrote on Instagram.

“The worst of it has been this nerve pain in my spine shooting down my right side. I wouldn’t wish this pain on anyone. It just never stops and it’s all consuming, while trying to work, travel, do gigs etc.”

“I am however so grateful for the fact that I have been able to have spinal surgery yesterday. I hope it gives me relief and the strength comes back in my arm,” he added.

“My goal is to get all of this sorted and bounce back hard for tour early next year. I’ll get there and I will get it done but wow, in a fair bit of pain right now.”

Fans and friends flooded the post with messages of support.

Country music star LeAnn Rimes wrote, “Sending lots of healing your way, my friend.”

Richard Wilkins added, “All strength to you Champ! Much love to all.”

Michelle Bridges commented, “Sending you the biggest hugs honey ❤️❤️❤️ here’s to the come back babe 🙌🙌🙌.”

MAFS star Duncan James wrote: “All the best mate! Hopefully you can get it sorted down the track 🤗.”

Sebastian’s former Australian Idol rival Shannon Noll also sent his well-wishes, saying “hope you recover quick mate! 🙏”

Sebastian’s spinal surgery marks his second significant operation this year.

In May, he underwent surgery for a ruptured Achilles tendon after playing a local footy game with AFL legend Brendan Fevola for the Masala Dandenong Football Club.

The singer wasn’t supposed to play the second half but he chose to stay on the field and injured himself, which led to the surgery and a six-month recovery period.

“It was a great day out for Masala Dandenong getting their first win with @brendanfevola25 kicking a bag! Unfortunately I’ve done a proper number on myself. #realitycheck #sticktosinging #footyglorydaysareover,” Sebastian wrote at the time.

Images: Instagram