Lady Gaga disclosed that she has a medical condition that has left her unable to walk, and has postponed several concerts as a result, reports People.com.
Gaga, 26, said she has synovitis, a severe inflammation of the joints.
"I’ve been hiding a show injury and chronic pain for some time now, [and] over the past month it has worsened," Gaga wrote Tuesday on her Facebook page. “I’ve been praying it would heal. I hid it from my staff. I didn’t want to disappoint my amazing fans. However, after last night’s performance I could not walk and still can’t."
The singer postponed concerts in Chicago, Detroit and Hamilton, Ontario.