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Lady Gaga has been forced to postpone four shows during the remainder of this week due to severe joint pain caused by an undisclosed injury.

The show’s affected are tonight and tomorrow night’s (February 13-14) shows at the United Center in Chicago, Saturday’s show at the Palace of Auburn Hills in Detroit, and Sunday’s concert at the Copps Coliseum in Hamilton, Ontario.

“I am completely devastated and heartsick,” Lady Gaga wrote in a press release announcing the postponements. “I’ve been hiding this injury and pain from my staff for a month, praying it would heal, but after last night’s performance I could not walk. To the fans in Chicago, Detroit and Hamilton, I hope you can forgive me as it is nearly impossible for me to forgive myself right now. I would do anything for you. I will hopefully heal soon as possible and be at 500% again, which is what you deserve.

She also took to Twitter to apologize to her 34 million followers.

“It will hopefully heal as soon as possible, I hate this,” she tweeted. “I hate this so much. I love you and Im sorry.”

The canceled dates are part of Gaga’s “Born This Way Ball” world tour, and after the Hamilton date, her next scheduled concert is a two night stand at Philadelphia’s Wells Fargo Center February 19-20, which will be followed by another two-night gig at Madison Square Garden in New York February 22-23.

The tour precedes the artist’s next album, ARTPOP, which is scheduled to be released later this year. Though an official release date has not yet been announced, Billboard reports that multiple sources say the album likely won’t be out until “as late as September.”

Additionally, a documentary about the recording of that album by Terry Richardson also will be released this year, and it would be assumed that it will come around the same time as the album.