The tick-borne disease—which singer Justin Timberlake revealed this week he has been suffering from—is increasing in the U.S. both in range and frequency.

The singer said living with Lyme disease “can be relentlessly debilitating, both mentally and physically.” Here’s what to know about the condition caused by ticks.

Justin Timberlake announced he's been battling Lyme disease, a debilitating infectious disease typically transmitted through a tick bite. Tick populations and bites are at their highest levels in over five years,