Why is Gaga unable to walk? Fans of the “Born This Way” singer were disappointed to learn Feb. 11 that Gaga is postponing her next four shows in Chicago, Detroit and Hamilton because she is unable to walk.

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The singer hid her injury from her fans. Lady Gaga is known for being overdramatic in everything that she does, but her injury, a case of synovitis, could be serious.

Synovitis is a major problem in rheumatoid arthritis, lupus and psoriatic arthritis. It could also be related to tuberculosis or gout. We’re sure her fans are hoping for the best and that Gaga being unable to walk due to synovitis is an isolated event.

Synovitis has many causes, including infection, direct joint trauma, allergic reaction, gout, overuse and inflammatory diseases. In Lady Gaga’s case, it may be direct joint trauma or overuse. The singer is known for her wildly theatrical performances which, no doubt, take a toll on her body. If the case of synovitis is severe, then the singer has good reason to postpone a couple shows in order to get her health back to normal.

So how can Gaga, unable to walk, get her physical health back to its peak? Depending on the cause of synovitis, treatments can range from rest and elevation of the knee to anti-inflammatory medicine. In some cases, arthroscopic surgery may be performed to remove all or part of the affected synovial tissue.

Here’s to hoping that Lady Gaga won’t have to undergo surgery!

Gaga has fans worried that she may be pushing herself too hard. The singer recently vomited on stage in Barcelona while performing her smash hit "Edge of Glory."

Gaga postponed her next four shows on her Born This Way Ball tour to as-of-yet unknown dates. In typical Lady Gaga fashion, she took to her Twitter to explain herself and clear the air.

This isn’t the first time she has postponed a concert due to heath concerns. In 2010, the singer collapsed before a planned performance at Purdue University and was forced to cancel, saying it was due to "exhaustion."

She tweeted: "I hope you can forgive me. I love my little monsters more than anything, you are everything to me … I am so devastated.”

"I've been hiding a show injury and chronic pain for sometime now, over the past month it has worsened… I've been praying it would heal,” she tweeted on Feb. 11.

I've been hiding a show injury and chronic pain for sometime now,over the past month it has worsened. I've been praying it would heal

— Lady Gaga (@ladygaga) February 12, 2013

Due to a case of synovitis, (severe inflammation of joints) Gaga’s doctor has ordered her to postpone show in Chicago, Detroit + Hamilton — Lady Gaga (@ladygaga) February 12, 2013

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

— Lady Gaga (@ladygaga) February 12, 2013