She was set to host the 2016 ARIA Awards last week but pulled out after falling ill.

Now, those close to Delta Goodrem have serious concerns for her heath, according to Woman's Day.

Delta Goodrem arrives at the 58th Annual Logie Awards at Crown Palladium on May 8, 2016. Photo / Getty
Delta Goodrem arrives at the 58th Annual Logie Awards at Crown Palladium on May 8, 2016. Photo / Getty

'Everyone's really worried about Delta,' a source told the magazine. 'To pull out at the last minute means there must be something seriously wrong with her.'

Delta Goodrem performs live on stage at the 2008 ARIA Chart Awards. Photo / Getty
Delta Goodrem performs live on stage at the 2008 ARIA Chart Awards. Photo / Getty

According to the magazine, concerns were raised over her health earlier this year during the filming of her music video for The River.

In the video, the songstress takes part in what looks like an emotional baptism ceremony in 'The River'.

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'Delta couldn't move a muscle without someone fussing over how she was feeling,' the source reportedly said.

'Her manager almost killed the whole shoot because he was worried about how long she was spending in the water.'

Delta Goodrem takes a selfie with fans at the 28th Annual ARIA Awards 2014. Photo / Getty
Delta Goodrem takes a selfie with fans at the 28th Annual ARIA Awards 2014. Photo / Getty

Delta's health was first thrust into the spotlight in 2003.

Aged just 18, she was diagnosed with a rare type of cancer called Hodgkin's Lymphoma, just months after the release of her debut album Innocent Eyes.

Delta Goodrem attends the Aria #1 Chart Awards at Luna Park August 3, 2004 in Sydney. Photo / Getty
Delta Goodrem attends the Aria #1 Chart Awards at Luna Park August 3, 2004 in Sydney. Photo / Getty

She underwent chemotherapy to treat the disease and announced she was in remission in December that year.

Less than a year later she released her second studio album Mistaken Identity, which went on to be certified five times platinum after selling more than 350,000 copies.

Delta's new album Wings of The Wild flew to the top of the ARIA charts when it was released in July, but has since slipped to No. 42.

Daily Mail Australia has approached Delta's representatives for comment.