Lyme disease surges across all 50 US states as tick threats grow

Tick-borne illnesses have risen sharply in the US, with Lyme disease leading the increase. Between 2016 and 2017, reported cases jumped by 22%, reflecting a broader upward trend over recent decades. The disease now affects every state in the country. Lyme disease has spread across all 50 US states, a stark change from its earlier concentration in specific regions. Since the late 1990s, the number of reported cases has tripled, making it the most common tick-borne illness by far.

Ticks responsible for transmitting Lyme disease thrive in tall grass and often latch onto warm, hidden areas of the body. Many people overlook them because some ticks are no larger than a printed full stop. The highest-risk period runs from May to August, when tiny infected nymphs—young ticks—are most active. Diagnosing Lyme disease can be tricky, as not all patients develop the classic bull’s-eye rash. Without prompt treatment, the infection can lead to lasting health complications. Children face a greater risk due to their outdoor activities and closer proximity to the ground, where ticks often lurk.

The steady rise in Lyme disease cases highlights the growing threat of tick-borne illnesses nationwide. Public awareness of prevention and early symptoms remains critical, especially during peak seasons. Health officials continue to monitor the spread as numbers climb each year.