"I've been hiding a show injury and chronic pain for some time now," Gaga said in a series of tweets. "Over the past month it has worsened. 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."
Because of the severity of Gaga's synovitis, a severe inflammation of the joints, her doctor has asked her to postpone her upcoming shows. "To the fans in Chicago, Detroit & Hamilton, I hope you can forgive me, as it is nearly impossible for me to forgive myself. I'm devastated & sad."
Beyond Hamilton, there are 14 more cities on the Born This Way tour, which is scheduled to finish in Tulsa, Okla., on March 20.
Related Articles on TVGuide.com
Other Links From TVGuide.com