Sia opened up about her health to fans.

The singer, 43, tweeted on Friday that she's been battling a neurological disease and suffers from chronic pain.

"Hey, I'm suffering with chronic pain, a neurological disease, ehlers danlos and I just wanted to say to those of you suffering from pain, whether physical or emotional," Sia wrote.

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"I love you, keep going. Life is f--king hard. Pain is demoralizing, and you're not alone," she added.

According to the Ehlers Danlos Society’s website, Ehlers Danlos Syndrome is a group of genetic disorders “generally characterized by joint hypermobility (joints that stretch further than normal), skin hyperextensibility (skin that can be stretched further than normal), and tissue fragility."

Sia has also been candid about her struggles with addiction.

Sia attends The Daily Front Row Fashion LA Awards 2019 on March 17, 2019 in Los Angeles, California.  (tefanie Keenan/Getty Images for Daily Front Row))

In 2018, she celebrated eight years of sobriety. In a 2013 interview with Billboard magazine, Sid admitted that she "got seriously addicted to Vicodin and Oxycodone, and I was always a drinker but I didn’t know I was an alcoholic. I was really unhappy being an artist and I was getting sicker and sicker.”

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In addition, the entertainer was diagnosed with hyperthyroid disease.