When Justin Timberlake revealed that he’s been battling Lyme disease on Instagram, it lit up the internet. Some people sent well-wishes, others asked questions about the illness, and a few—of course—propagated bucket loads of misinformation.

Musician Justin Timberlake shared that he’s been struggling with the “relentlessly debilitating” Lyme disease during his recently wrapped Forget Tomorrow World Tour.

Exactly how often Lyme disease strikes isn’t clear. The Centers for Disease Control and Prevention cites insurance records suggesting 476,000 people are treated for Lyme disease in the U.S. each year