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.

Lyme disease is spread by black-legged ticks that are found across the country, including Washington state. Here's how to spot and treat the symptoms.

The singer-songwriter and actor shared the diagnosis in a social media post at the conclusion of his Forget Tomorrow World Tour.