UPDATE: Lady Gaga has cancelled the remaining concerts for her tour due to her need to undergo surgery.

Lady Gaga has been battling chronic pain from a severe injury while on tour. The "Bad Romance" singer has postponed a number of her upcoming concerts because she can barely walk after hurting herself more than a month ago and is suffering from synovitis, which is severe inflammation of the joints.

The 26-year-old star revealed she was forced to cancel a number of her shows on her Facebook page on Tuesday, saying, "I barely know what to say. I've been hiding a show injury and chronic pain for some time now, [and] 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."

The pop star was forced to postpone two concerts in Chicago, one in Detroit and one in Hamilton, Ontario. "I hope you can forgive me, as it is nearly impossible for me to forgive myself. I'm devastated & sad. It will hopefully heal as soon as possible. I hate this. I hate this so much. I love you and I'm sorry," she said.