A celebrity who won’t allow you to create a fantasy about them has an almost disarming quality. Most well-known people in Sia’s shoes—a Grammy-nominated pop songwriter whose voice has powered hits for Britney Spears, Rihanna, and Beyoncé—would discreetly vanish behind a stylist and reappear looking different without ever realizing it. Sia has never been the most well-known person. She acknowledges that she covers her face with an enormous wig when performing. Nevertheless, she speaks more than almost anyone about the condition of her body.
Sia did not choose or expect to gain weight. She gained a substantial amount of weight due to a medication she had to take, which she was unable to lose with exercise or thyroid medication. That particular detail is more important than it might seem. This was not a story about lifestyle. It wasn’t a subdued slide toward solace. It was a body reacting to chemical intervention, as bodies do occasionally, and it did so without consent.
Instead of keeping quiet, Sia decided to make her decision to have liposuction public. She posted openly on X to ensure that no one would later attribute her altered appearance to a diet and exercise regimen she hadn’t truly followed. It’s a minor act with a sharp point. Every month, a celebrity appears noticeably thinner on social media and promotes “clean eating and early mornings.” Sia effectively blocked that pattern by stepping in front of it. She seemed slightly annoyed by the notion that silence would imply otherwise, and she wanted people to know that her body did not change through willpower.
She had previously had liposuction. She acknowledged that a previous procedure on her stomach had not gone well in an interview with doctor Gabor Maté back in 2021. She described the outcome in terms that made the experience sound genuinely unpleasant. Reexamining a process that had failed her in the past has a subtly courageous quality. The majority of people would leave that experience behind and never talk about it in public. Sia returned and informed everyone.
Additionally, she underwent liposuction twice on her chin, a decision she later questioned after realizing that the fullness she had been attempting to remove was actually muscle used for singing. I’ve never forgotten that specific detail. A singer was afraid of how her voice would appear, so she removed the very physical structure that contributed to its creation. The subtle demands made on women by the entertainment industry, including those who choose not to reveal their identities, are unsettling.
Sia is a Grammy nominee and has written songs for some of the biggest names in pop music, including Beyoncé, Rihanna, Katy Perry, and Kylie Minogue. She does not operate at the periphery of the industry. She managed a complex relationship with her appearance while shaping it from behind the curtain, frequently literally. Wigs have always served as a kind of armor. As it happens, the honesty is too.
Her disclosure was warmly received by fans, who praised her candor and offered support regardless of the decisions she made regarding her body. People are frequently more at ease with honesty than with the polished fiction they are typically offered, which is something the industry tends to underestimate, which is why that reaction is noteworthy. When Sia stated, “I am insecure like most people,” she wasn’t admitting to being weak. In a roundabout way, she was helping the audience.
Discussions about celebrity bodies, weight fluctuations brought on by medications, and cosmetic procedures seem more complicated than ever in 2025. An already complex picture has been further complicated by the proliferation of weight-loss drugs. Sia’s story—weight gain from medication, the decision to use lipo as a remedy, and the entire process shared on social media—reads almost like a case study of what public body transparency can truly look like when someone gives it their all. It remains to be seen if it becomes a model for others. For the time being, it remains one of the more candid statements made by a public figure regarding the disparity between a body’s appearance and its origins.
FAQs
1. Why did Sia gain weight?
A required medication caused her body to put on significant, unshiftable weight.
2. What procedure did Sia undergo for her weight gain?
She chose liposuction after diet, exercise, and thyroid medication all failed her.
3. Has Sia had liposuction before?
Yes — twice on her chin and once on her stomach in 2021.
4. Why did Sia go public about her body changes?
She refused to let people assume her slimmer figure came from diet and discipline.
5. How did fans react to Sia’s honesty?
They praised her transparency and expressed unconditional support for her choices.