Pop singer Justin Timberlake announced that he has been struggling with Lyme disease, bringing attention to a growing public health threat. Timberlake, 44, said in an Instagram post Thursday that he was “shocked for sure” by his diagnosis after he had been “battling some health issues” and feeling unwell during his Forget Tomorrow World Tour.

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.