Klinefelter syndrome is a genetic condition in which males (who normally have one X chromosome and one Y chromosome) possess an extra X chromosome (XXY karyotype).
About 1 out of every 500 men have an extra X chromosome, but not all men have symptoms and signs. When signs and symptoms do occur, Klinefelter syndrome is associated with
- a taller, less muscular body,
- less facial and body hair, and
- broader hips than other boys.
Other associated Klinefelter syndrome signs and symptoms can include
- breast enlargement in men,
- delayed puberty,
- flaccid muscles,
- low-set ears,
- low energy level,
- reduced sex drive, and
- a small penis.
Cause of Klinefelter syndrome
The condition is not inherited, rather it is caused by a random error that results in a male being born with an extra X chromosome.
Other klinefelter syndrome symptoms and signs
- Breast Enlargement in Men
- Broader Hips Than Other Boys
- Delayed Puberty
- Flaccid Muscles
- Less Facial and Body Hair
- Low Energy Level
- Low-Set Ears
- Reduced Sex Drive
- Small Penis
- Taller, Less Muscular Body
Main Article on Klinefelter Syndrome Symptoms and Signs
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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.