The Grease actress, who turns 70 in just a few days' time, told Channel Seven's Sunday Night that doctors have found a tumour at the base of her spine.
Olivia's third cancer diagnosis comes after she was first treated for the disease back in 1992, after finding a lump on her right breast. The "Grease" star says for pain, she is taking cannabis oil, made from marijuana her husband grows in California. "But my husband's always there, and he's there to support me".
"I'm one of millions in this fight, in this journey", Newton-John says.
Newton-John was diagnosed for a second time in 2013, a new breast cancer which had spread to her shoulder, forcing her to postpone a tour of the United States and Canada.
Outside of her own battles with cancer, the disease has struck another member of her family: Her sister died six weeks after being diagnosed with an aggressive form of brain cancer in 2013.
Man arrested after crashing car through barriers, onto runway at Lyon airport
A passenger waited for his flight, in December 2011, during a strike at Lyon-Saint Exupery airport, central France. The driver the sped on to the runway, government spokeswoman Christelle Monteagudo told the Associated Press.
So he makes me tinctures.
Asked how she's coping, Olivia admitted: "I have my moments, but I'm not going to have my moment here!" In 2013, a minor auto accident led to the discovery of a lump in her right shoulder. "I'd be lying if I said I never go there", Newton-John, 69, said.
But despite all the hardship, Olivia is keeping a positive mind and believes there are people out there who are far worse off than her. Newton-John added, "A lot of people see it as a fight". And, um, I'm a very privileged person, and I'm very aware of that. "So if I allow myself to go there, I could easily create that, you know, big fear", she said.
"I live in a handsome place, have a wonderful husband, all these animals I adore, I have an incredible career - I have nothing really to complain about".
She told Australian show "Sunday Night" that she believes she will "win over it".
"I feel so fortunate to have had the success I've had, and to do the wonderful things I do", she continued.