Olivia Newton-John on 2nd cancer battle: 'The pain level was really the hardest thing'

PHOTO: Olivia Newton John attends the Olivia Newton-John Gala Red Carpet at Crown Palladium, Sept. 8, 2017 in Melbourne, Australia.PlaySam Tabone/Getty Images
WATCH Olivia Newton-John reveals she used marijuana to ease cancer pains

Olivia Newton-John has opened up about her second bout with cancer, revealing that she was in so much pain she couldn't walk just weeks ago.

"I can walk, but I can't go long distances,” she told Australia's "60 Minutes." "But I'll get there, because I couldn't walk at all a month or so ago. As I heal I'll be able to walk more."

The Australian-born singer, 67, revealed in May that she had been diagnosed with breast cancer for the second time. Her rep told ABC News that Newton-John, a 25-year breast cancer survivor, had learned that back pain she has been experiencing was a symptom of breast cancer that metastasized to the sacrum.

"The pain level was really the hardest thing," the "Grease" star told "60 Minutes." "I was trying to do shows and it was pretty agonizing."

Newton-John underwent a course of photon radiation therapy and other natural wellness treatments.

"I need to get through this," she said in the televised interview. "I have lots to do, but of course, it's scary. I'd be lying if I said it wasn't scary. It was, but I felt very sure that I would get through."

Today, the star remains optimistic.

"It's probably something I'll deal with the rest of my life," she said. "But I will and I'll be fine and there have been a lot of women, who have had reoccurrences, and continue on with their lives to be old ladies. That's my vision."