Rapper Megan Thee Stallion was taken to hospital part-way through her performance of Moulin Rouge! The Musical, in New York on Tuesday night.
"I thought I was gonna faint on stage, I really tried to push through my performance but I just couldn't," she wrote on social media the next day.
"I've been pushing myself past my limits lately, running on empty, and my body finally said enough. It honestly scared me."
Megan, 31, says she will return to the Broadway stage on Thursday to resume her role as Zidler, the show's eccentric master of ceremonies.
"I'll be right back on that stage Thursday, stronger, clearer, and ready to give you 100% the way you deserve," she said addressing her fans.
Earlier, her representatives told US media that she was taken to a New York hospital after she "started feeling very ill".
"Doctors ultimately identified extreme exhaustion, dehydration, vasoconstriction and low metabolic levels as the cause of her symptoms" they said. "Megan has since been treated, discharged and is now resting."
"Megan is incredibly grateful for the prayers and well-wishes from her supporters" the representatives added.
Megan Thee Stallion, whose real name is Megan Pete, premiered in her highly anticipated Broadway debut as Zidler on 24 March.
She is scheduled to play the leading role until 17 May, the Moulin Rouge website says. Ahead of her premiere, she expressed excitement for briefly substituting concerts with theatre performances.
Megan Thee Stallion is best-known for hits including Savage, WAP and Body.
In 2021, she won three Grammy awards for Best Rap Song, Best New Artist and Best Rap Performance. The following year she was nominated for Album of the Year.
Harold Zidler was first played by Danny Burstein in the original Broadway cast of Moulin Rouge, and won a coveted Tony award in 2020 for it. More recently, celebrity drag artist Bob the Drag Queen played Zidler in the musical for eight weeks earlier this year.
The BBC has contacted Moulin Rouge! The Musical for comment.
