Lyme disease, a tick-borne illness caused by the bacterium "Borrelia burgdorferi," presents a wide range of symptoms that can vary significantly from person to person. In its early stages, the disease often begins with a distinctive bull's-eye pattern around the tick bite site. Other common early symptoms include fever, fatigue, headache, and muscle or joint aches. If left untreated, Lyme disease can progress to more severe issues, such as neurological problems, joint inflammation, and ...