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Ticks are small, insect-like creatures that live in woods and fields. They attach to you as you brush past bushes, plants, and grass. Once on you, ticks often move to a warm, moist location, like the armpits, groin, and hair. They typically attach firmly to your skin and begin to draw blood for their meal.
Ticks can be fairly large -- about the size of a pencil eraser -- or so small that they are almost impossible to see. Ticks can cause a variety of health conditions ranging from harmless to serious.
See also: Tick bites
While most ticks do not carry diseases, some ticks can cause:
Watch for the symptoms of these diseases in the weeks following a tick bite:
Watch for a red spot or rash starting at the location of the bite.
The tick itself can cause paralysis in humans (called tick paralysis). Symptoms include:
Call your doctor if you have not been able to remove the entire tick. Also call if in the days following a tick bite you develop:
Call 911 if you have any signs of:
If a tick is attached to you, follow these steps to remove it.
After returning home:
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Feder HM Jr, Johnson BJ, O'Connell S, Shapiro ED, Steere AC, Wormser GP. Ad Hoc International Lyme Disease Group. A critical appraisal of "chronic Lyme disease." N Engl J Med. 2007;357:1422-1430.
Halperin JJ, Shapiro ED, Logigian E, Belman AL, Dotevall L, Wormser GP, et al. Practice parameter: treatment of nervous system Lyme disease (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology. 2007;69:91-102.
Wormser GP, Dattwyler RJ, Shapiro ED, Halperin JJ, Steere AC, Klempner MS, et al. The clinical assessment, treatment, and prevention of Lyme disease, human granulocytic anaplasmosis, and babesiosis: clinical practice guidelines by the Infectious Diseases Society of America. Clin Infect Dis. 2006;43:1089-1134.
Review Date:5/20/2008
Reviewed By:Jatin M. Vyas, PhD, MD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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