Mother Monster isn't doing well.

Lady Gaga was forced to cancel her performance at the Rock in Rio music festival in Brazil after being hospitalized for "severe pain."

"Brazil, I’m devastated that I’m not well enough to come to Rock in Rio. I would do anything 4 u but I have to take care of my body right now. I ask for your grace and understanding and promise that I will come back and perform for you soon. I’m so sorry and I love you so much," she wrote on Instagram.

“I was taken to the hospital, it is not simply hip pain or wear and tear from the road, I am in severe pain. But am in good hands w/ the best doctors. Please don’t forget my love for you. Remember years ago when I tattooed Rio on my neck, the tattoo was written by children in the favelas. You hold a special place in my heart I love you," she added in a follow-up post.

The songstress opened up about her battle with fibromyalgia in her upcoming Netflix documentary Gaga Five Foot Two, which premieres on September 22.

Feel better, Gagaloo!