Tributes from fans and celebrities are flowing in for former Home and Away star Johnny Ruffo after he revealed that his brain cancer has returned.

He battled the illness in 2017 and was given the all-clear after rounds of chemotherapy, but unfortunately, the illness has come back.

Ruffo shared the news on his Instagram page.

"After an unexpected week of seizures and excruciating headaches it is with a heavy heart that i have to let you know i now have another huge battle ahead of me as my brain cancer has returned," he wrote.

He added: "Though i will dig deep and beat this sht disease again 👊🏽💜 #fckcancer"

https://www.instagram.com/p/CH94l3tFD6S/

A number of his former co-stars and other celebrities offered their support on the post with Home and Away star Penny McNamee sending her love.

"Will be praying for you Johnny. You have so much love and support behind you. Xxx"

Dan Ewing, who also acted alongside Johnny on the hit soap added: "Let's get after it Ruffo!!"

Carrie Bickmore offered her support as well.

"Oh Johnny....Sending so much so love. Kick it's arse 👊🏻"