The 'Tik Tok' singer issued a statement to her fans saying she'll be away for a while facing her demons.
Ke$ha, 26, told TMZ: "I'm a crusader for being yourself and loving yourself, but I've found it hard to practice."
She went on to say: "I'll be unavailable for the next 30 days, seeking treatment for my eating disorder... to learn to love myself again, exactly as I am."
The popstar has issued no further comment on social media about her illness or her self-imposed exile.
The last time she checked in with her fans on Twitter, she posted a picture of her new tattoo of a smiley face.
She wrote: "Cheers to this year being the best year ever. 2014 gon be the year of truth and freedom."
Ke$ha - who has her own reality TV show called My Crazy Beautiful Life - is said to have been admitted to a Chicago treatment facility on Friday morning (3 January).
The star is reportedly staying in the same centre where Demi Lovato has also received treatment for her past issues.
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Watch the video to Pitbull's 'Timber' featuring Ke$ha: