Anastacia has urged people fighting cancer to embrace the "good days"

She told OK! magazine: "I want to help people know that even if you have cancer, Crohn's disease... the more you let it occupy your thoughts on a regular basis, you are not living in the moment.

"What I try to do is make a difference in other people's lives, give them hope and faith that what they're going through is not forever.

"There's ebbs and flows, just allow your good day to be OK. If the bad day comes, don't shun it - it probably needs to happen."

After her second cancer diagnosis, the Left Outside Alone hitmaker set up the Anastacia Fund to raise money for awareness of breast cancer in young women.

She added: "I will do it forever."

Anastacia previously recalled feeling at a loss when doctors could not give her a definitive answer about her health problems because they were not genetic.

Speaking on the Turning Point podcast, she said: "I felt so betrayed by medicine. And when I say that I mean how doctors approach you as a woman is - do you have breast cancer in your family? And I go 'Mum?' No, we don't. Ok great.

"And they let it go.

"But when I hear the stats of women with breast cancer, 70% of those women with breast cancer is not genetic so why ask me and then toss it aside when the smaller amount of breast cancer is genetic and the bigger amount is unknown?

"Like, that's the bigger number so shouldn't we pay attention or give some knowledge.

"And they're like - 'Well it's really hard as doctors because we can't tell you what not to do.'

"We can't tell you that it's food, we can't tell you that it's air, we can't tell you that it's stress, we can't tell you that it's anything particular, it's probably all of that, but it's definitely happening at a wider range than it is genetic.'

"So I'm like great, I'm going to talk about it."