"I just wanted to say to those of you suffering from pain, whether physical or emotional, I love you, keep going", she adds.
But on Friday the 43-year-old singer, whose real name is Sia Furler, shared an intimate detail about herself, revealing to fans on Twitter that she suffers from chronic pain related to Ehlers-Danlos syndrome, which she called "a neurological disease".
Sia joined show business as a teenager singing in the acid jazz band Crisp and is known for the wig she wears to hide her face.
Other issues caused by Ehlers-Danlos syndromes can include: chronic early onset debilitating musculoskeletal pain, arterial/intestinal/uterine fragility or rupture, scoliosis, poor muscle tone, mitral valve prolapse and gum disease.
The singer-songwriter Sia Furler has disclosed that she has the chronic pain disease Ehlers-Danos syndrome, and told others suffering from pain "you're not alone".
Sia added in her tweet: "Life is f-- hard".
In 2017, Lady Gaga revealed the pain she was dealing with during the filming of the Gaga: Five Foot Two documentary was fibromyalgia, which ultimately led her to cancel some dates on her Joanne World Tour.
Ehlers Danhlos is a genetic disorder that weakens the connective tissue in your body.
There are many different types of EDS, and according to the Ehlers-Danlos Society its prevalence is somewhere between one in 2,500 to one in 5,000 people.
While doctors did not use to associate Ehlers-Danlos with neurological symptoms, researchers are starting to understand the condition's neurological impacts.
Along with writing her own pop sensations, Sia has also written songs for Adele, Rihanna, Beyonce and Katy Perry.
Sia's message is resonating with fans, who are showing their support.