As explained on the website of the Centers for Disease Control (CDC), Lyme disease is a condition that starts with a rash and then eventually develops to the loss of ability to move one or both sides of the face, joint pain, severe headaches, and even heart palpitations.

"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."

Justin Timberlake has been diagnosed with Lyme disease, the former NSYNC star said on Instagram Thursday. LOS ANGELES — Justin Timberlake has been diagnosed with Lyme disease, the former NSYNC star said on Instagram Thursday.