 The unsettling thing about some symptoms is... I had a fever and these terrible headaches. You don't always know what's causing them. It was Lyme disease from a tick bite. I had West Nile virus from a mosquito. He had a reaction to cockroach allergens. Threats to your health can come from unexpected places. Get the facts. Visit pestrole.org. A public service message from the National Pest Management Association. Don't you wish your life came with a warning app?