Justin Timberlake has revealed he’s been quietly battling Lyme disease—while continuing to perform on his world tour. In a recent Instagram post, the pop star shared that he pushed through “massive nerve pain,” extreme fatigue, and an array of confusing symptoms before getting a diagnosis. If that sounds familiar, it’s because Lyme disease often hides in plain sight—and can turn into a life-altering condition if it goes untreated. Here's what to know about Lyme, its strange symptoms, and why it’s more common than you think.