When it comes to her chronic pain, Lady Gaga is no longer able to keep her poker face.

The singer revealed yesterday via Twitter that she suffers from synovitis, or severe joint inflammation, and her rigorous tour schedule has aggravated her condition to the point that she can no longer walk! She has been forced to postpone the next four shows on her tour in a bid to recover.

Related Article: Lady Gaga vs. Nicki Minaj -- Stuffed Animal Dress Showdown

Related Article: Celebrity Feud: Mother Monster vs. Mother Osbourne

"I've been hiding a show injury and chronic pain for sometime now, over the past month it has worsened," she tweeted yesterday. "I hid it from my staff, I didn't want to disappoint my amazing fans. However after last nights performance I could not walk and still can't."

The concerts that were scheduled for tonight and tomorrow in Chicago, Saturday in Detroit and Sunday in Hamilton, Ontario, Canada have been cancelled for now, but makeup dates will be announced later. Gaga is hoping to resume her Born This Way Ball Tour in Philadelphia on Tuesday.

"To the fans in Chicago Detroit & Hamilton I hope you can forgive me, as it is nearly impossible for me to forgive myself. Im devasted & sad," she wrote. "It will hopefully heal as soon as possible, I hate this. I hate this so much. I love you and Im sorry."

What do you think of Gaga postponing her shows?

Photos courtesy of Getty Images