Lyme disease is diagnosed based on symptoms, physical findings, and a history of possible exposure to infected ticks. Laboratory tests can be performed to confirm the presence of Lyme disease, but are not necessary when a person has the characteristic rash that often accompanies an infected tick bite. However, not everyone with Lyme disease will develop the characteristic bulls-eye rash, and in that case, laboratory tests may be necessary.
Lyme disease is frequently overdiagnosed because the symptoms can be nonspecific and are often found in other conditions as well. It is important that anyone experiencing symptoms of Lyme disease see a health care provider to rule out or confirm the presence of the disease through proper diagnostic testing.