By Alli Rosenbloom, CNN

(CNN) — Justin Timberlake is sharing that he has been “battling some health issues” as he concludes his Forget Tomorrow World Tour, including that he was recently diagnosed with Lyme disease.

The “Mirrors” singer opened up about his diagnosis in an Instagram post Thursday, writing that he wanted to “shed some light” on what he’s been going through behind the scenes.

“Living with this can be relentlessly debilitating, both mentally and physically,” Timberlake wrote. “When I first got the diagnosis I was shocked for sure. But, at least I could understand why I would be onstage and in a massive amount of nerve pain or, just feeling crazy fatigue or sickness.”

Lyme disease is a bacterial infection, with the bacterium Borrelia burgdorferi being the most commo

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