"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. "When I first got the diagnosis I was shocked for sure.

As revealed in a vulnerable Instagram post just one day after his final show, the pop superstar had long been suffering from nerve pain and severe fatigue caused by Lyme that made him question whether he should stop touring.

Justin Timberlake has been diagnosed with Lyme disease, the former NSYNC star announced on Instagram Thursday. Timberlake shared the news in a post commemorating his Forget Tomorrow tour, which wrapped in Turkey on Wednesday,