Lyme disease may sound like something out of a spy thriller, but it’s a very real, very sneaky illness carried by ticks. Lyme disease is a bacterial infection caused by Borrelia burgdorferi,

“I’ve been battling some health issues, and was diagnosed with Lyme disease,” Timberlake wrote. “If you’ve experienced this disease or know someone who has,” he added, “then you’re aware: living with this can be relentlessly debilitating, both mentally and physically.”