Lady Gaga has been forced to call off the Rio concert of her world tour, citing "Severe pain" for which she had to be hospitalized.

She wrote on Twitter & Instagram: "It's not simply hip pain or wear & tear from tour, I'm in severe pain. I'm in good hands [with] the very best doctors."

On her Instagram post she shared a photo of her tattoo that reads "Rio", adding "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."

In another post she wrote: "I would do anything 4 u but I have to take care of my body right now."

Lady Gaga has fibromyalgia, a chronic pain condition which she has in the past documented on social media; in November she posted a description of the ice baths, infrared saunas & emergency blankets she uses to manage her condition.

She has said that her approaching Netflix documentary, Gaga: 5 Foot 2, will document her experience of fibromyalgia, "To help raise awareness & connect people who have it".

Her tour continues in Barcelona on 21 Sept., with 5 UK concerts in London, Birmingham & Manchester beginning 9 Oct.