A family source tells PEOPLE that the Grammy winner's diagnosis has "brought clarity to a series of unexplained issues" as Biel has been "incredibly supportive"

Pop singer Justin Timberlake announced that he has been battling Lyme disease. His diagnosis highlights the rising public health concern.

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.