CMAT has said her success is being "tarnished" by ongoing body shaming as she prepares for a sold-out Dublin show this weekend.
The Irish singer-songwriter, whose real name is Ciara Mary-Alice Thompson, shared a lengthy statement on Instagram after performing at BBC Radio 1's Big Weekend in Sunderland last weekend.
The 30-year-old said she had removed Instagram, TikTok and X from her phone to protect her mental health, but that recent online discussion about her body had still reached her.
"This isn’t going to be a nice post so I decided to cushion the blow by leading with a picture where I look literally amazing," she wrote.
CMAT said it had been difficult to describe how hard the past few days had been, adding that the commentary about her body had become harder to avoid as her profile has grown.
"It is literally so boring for me, a gorgeous genius, to keep having to yap on about how horribly I am treated because of my body," she wrote.
"I would love to stop but I cannot because it keeps happening, at an accelerating and worsening pace as I become more famous."
She added: "There is no relief from this, nobody can protect me or save me from this, and all that is demanded of me is more and more work as every environment I am placed in becomes more hostile."
The singer said she wanted to make clear that she was "not being defiant".
"I am not choosing to look like this or weigh this much as some kind of punk rock act of liberty," she wrote.
"I simply have a body, one that I would of course like to change in order to fit in and avoid all of this abuse, but I have had extreme difficulty in doing so.
"I don’t get a say in whether or not I want to be brave, I simply have to sit here and take it."
CMAT said she remained "very happy and grateful" for her career, but that the experience of seeing her dreams come true was increasingly being overshadowed.
"The success is increasingly becoming tarnished by the fact that I would be allowed to enjoy it so much more if I was thin," she wrote.
The post received messages of support from fans and fellow musicians, including Sophie Ellis-Bextor, who said it was "hard to read".
CMAT is due to play a sold-out show at St Anne’s Park in Dublin on Saturday as part of her Euro-Country tour.
Her third album, Euro-Country, was nominated for the Mercury Prize and was last week named Best Album at the Ivor Novello Awards.
In a statement, BBC Radio One said: "We fully support CMAT and condemn any toxic commentary aimed at her.
"She performed a phenomenal set at Radio 1's Big Weekend, which received an amazing reaction from the crowd in Sunderland and from those who’ve enjoyed it on iPlayer and Sounds."
Comments on Radio One’s social posts featuring CMAT from the Big Weekend have been disabled.
It is understood the BBC is in contact with CMAT and her team, and the broadcaster has offered its full support.
