Justin Timberlake 's announcement that he was diagnosed with Lyme disease has put a spotlight on the condition that impacts nearly 500,000 people in the United States each year, according to the Centers for Disease Control and Prevention.

Timberlake shared in a July 31 post on social media that he was diagnosed with Lyme disease while on his two-year Forget Tomorrow World Tour.

"If you've experienced this disease or know someone who has -- then you're aware: living with this can be relentlessly debilitating, both mentally and physically," Timberlake wrote, adding, "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."

The former *NSYNC member

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