Your browser does not support javascript:   Search for gard hereSearch for news-and-events here.


Genetic and Rare Diseases Information Center (GARD)

Print friendly version

Klinefelter syndrome

Other Names for this Disease
  • Klinefelter's syndrome
  • XXY syndrome
Related Diseases
More Related Diseases
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.


Newline Maker

What are the signs and symptoms of Klinefelter syndrome?

The most common symptom of Klinefelter syndrome is infertility. Other symptoms may include:

  • Small, firm testicles
  • Small penis
  • Only a small amount of body hair
  • Sexual difficulties
  • Enlarged breasts (gynecomastia)
  • Tall height
  • Abnormal body proportions (long legs, short trunk)

Boys with Klinefelter syndrome may also have learning disabilities and difficulty with speech and language development. They tend to be quiet, sensitive, and unassertive, but personality characteristics vary among males with this condition. [1]

Last updated: 3/3/2010

  1. Kirmse B. Klinefelter syndrome. MedlinePlus Web site. December 11, 2006; Accessed 4/1/2008.