First Time User? Enroll now.
Notice of Data Security Incident
COVID-19: Vaccine information and additional resources | Medicaid: The program is changing and you must take steps to keep your UNC Health providers
Home > Health Library > Male With Klinefelter Syndrome
Klinefelter syndrome is a genetic condition that affects males. Klinefelter syndrome occurs when a boy is born with one or more extra X chromosomes. Most males have one Y and one X chromosome. Having extra X chromosomes can cause a male to have some physical traits that are unusual for males.
Many men with Klinefelter syndrome do not have obvious symptoms. Others have sparse body hair, enlarged breasts, and wide hips. In almost all men, the testicles remain small. In some men, the penis does not reach adult size.
Current as of:
March 3, 2021
Author: Healthwise StaffMedical Review: John Pope MD - PediatricsMartin J. Gabica MD - Family MedicineAdam Husney MD - Family MedicineSiobhan M. Dolan MD, MPH - Reproductive Genetics
Current as of: March 3, 2021
Author: Healthwise Staff
Medical Review:John Pope MD - Pediatrics & Martin J. Gabica MD - Family Medicine & Adam Husney MD - Family Medicine & Siobhan M. Dolan MD, MPH - Reproductive Genetics
To learn more about Healthwise, visit Healthwise.org.
© 1995-2021 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.