Clubbing is a thickening of the flesh under the toenails and fingernails. The nail curves downward, similar to the shape of the round part of an upside-down spoon.
There is no specific treatment for the clubbing itself. Home care depends on the diagnosis.
If you notice clubbing, call your health care provider.
A person with clubbing usually has other symptoms and signs of a specific condition. Diagnosing that condition is based on:
- Family history
- Medical history
- Physical exam that looks at the lungs and chest
Medical history questions may include:
- Do you have any breathing difficulty?
- Does clubbing affect the fingers, toes, or both?
- Is it becoming more noticeable?
- Is the skin ever bluish-colored?
- What other symptoms do you have?
- When did you first notice this?
The following tests may be done:
Clubbing occurs with a wide number of diseases. It is most often found in heart and lung diseases that cause a lower-than-normal amount of oxygen in the blood.
Clubbing may also be due to lung cancer, and diseases of the liver and gastrointestinal tract.
Clubbing may also occur in families. In this case it may not be due to an underlying disease.
Fitzgerald FT, Murray JF. History and physical examinations. In: Mason RJ, Murray JF, Broaddus CV, Nadel JA, eds. Murray & Nadel's Textbook of Respiratory Medicine. 4th ed. Philadelphia, Pa: Saunders Elsevier;2005:chap 18.
Spicknall KE. Clubbing: an update on diagnosis, differential diagnosis, pathophysiology, and clinical relevance. J Am Acad Dermatol. 2005;52:1020-1028.
Review Date: 11/2/2009
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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