Experts say the tick population is on the rise along with tick-borne illnesses.

Data from the Centers for Disease Control and Prevention shows that the number of illnesses reported annually has quadrupled over the past two decades.

The CDC says ways to protect yourself against ticks include covering any exposed skin where ticks can bite, wearing long sleeves and long pants and tucking your pant legs into your socks.

The agency also recommends people thoroughly check themselves and their families for ticks after spending time in the woods or areas with tall grass. If you have been in one of those high-risk areas, doctors say it's important to be aware of the symptoms of Lyme disease and other illnesses caused by ticks.

"Early symptoms of Lyme disease, unfortunately are going to look a lot like the flu, so there'll be things like fever, fatigue, headaches and muscle aches," says Dr. Thomas Hart, of Johns Hopkins University.

A rash that looks like a bullseye may also develop, but not always.

Doctors say if you do experience symptoms, you need to visit a doctor. Starting treatment early can stop any disease or illnesses from causing long-term and sometimes serious issues.