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  • Klinefelter syndrome - Symptoms and causes - Mayo Clinic
    Klinefelter syndrome is a common condition that results when a person assigned male at birth has an extra copy of the X sex chromosome instead of the typical XY Klinefelter syndrome is a genetic condition that occurs before birth, but it often isn't diagnosed until adulthood
  • Klinefelter Syndrome: What It Is, Symptoms Treatment - Cleveland Clinic
    Klinefelter syndrome is a common genetic condition in which males have an additional X chromosome Symptoms may include breast growth, infertility, osteoporosis and learning difficulties Treatments usually involve physical and emotional therapy, as well as hormone replacement What is Klinefelter syndrome?
  • Klinefelter Syndrome: Symptoms, Causes, Diagnosis, and Treatment - WebMD
    Klinefelter syndrome, also known as XXY syndrome, is a condition in boys and men that’s caused by an extra X chromosome It can affect physical and mental development
  • Klinefelter Syndrome - Johns Hopkins Medicine
    Klinefelter syndrome occurs when a male is born with an extra X chromosome Thus a male with Klinefelter has XXY instead of the usual XY pair Because males with this condition produce less of the male hormone testosterone than other males, they are less masculine-looking than their peers
  • Klinefelter syndrome: MedlinePlus Genetics
    Klinefelter syndrome, also called 47,XXY, is a chromosomal condition that affects male development The signs and symptoms of Klinefelter syndrome vary In some cases, the features are so mild that the condition is not diagnosed until puberty or adulthood
  • About Klinefelter Syndrome - National Human Genome Research Institute
    Males who have Klinefelter syndrome may have the following symptoms: small, firm testes, a small penis, sparse pubic, armpit and facial hair, enlarged breasts (called gynecomastia), tall stature, and abnormal body proportions (long legs, short trunk)
  • Klinefelter Syndrome - Childrens Health Issues - MSD Manuals
    Klinefelter syndrome occurs when a boy has one extra X chromosome Boys may have learning disabilities, long arms and legs, small testes, and sometimes enlarged breasts The diagnosis is suspected at puberty when most of the symptoms develop
  • Klinefelter syndrome - NHS
    Klinefelter syndrome is caused by an additional X chromosome This chromosome carries extra copies of genes, which may interfere with the development of the testicles and mean they produce less testosterone (male sex hormone) than usual


















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