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  2. Klinefelter syndrome - Symptoms and causes - Mayo Clinic

    www.mayoclinic.org/diseases-conditions/klinefelter-syndrome/symptoms-causes/...

    Klinefelter syndrome occurs because of a random change in the egg or the sperm that causes a baby assigned male at birth to be born with an extra X sex chromosome. The condition is not passed down in families.

  3. Klinefelter Syndrome: What It Is, Symptoms & Treatment - ...

    my.clevelandclinic.org/health/diseases/21116

    What causes Klinefelter syndrome? Klinefelter syndrome occurs when theres an extra X chromosome in your genetic code. This change happens before birth and can happen in a few different ways: A sperm cell carries an extra X chromosome. An egg cell holds an extra X chromosome. Cells divide incorrectly during early fetal development. Healthcare ...

  4. Klinefelter syndrome - MedlinePlus

    medlineplus.gov/genetics/condition/klinefelter-syndrome

    Klinefelter syndrome, also called 47,XXY, is a chromosomal condition that affects development in people who are assigned male at birth. 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.

  5. 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.

  6. Klinefelter Syndrome - StatPearls - NCBI Bookshelf

    www.ncbi.nlm.nih.gov/books/NBK482314

    Identify the cause of Klinefelter syndrome. Screen individuals at risk of Klinefelter syndrome, especially during early childhood and puberty. Implement evidence-based interventions and treatment plans tailored to the specific needs of individuals with Klinefelter syndrome, focusing on hormonal therapies, speech and language therapies, and ...

  7. About Klinefelter Syndrome - National Human Genome Research...

    www.genome.gov/Genetic-Disorders/Klinefelter-Syndrome

    Klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. The most common symptom is infertility. Humans have 46 chromosomes, which contain all of a person's genes and DNA. Two of these chromosomes, the sex chromosomes, determine a person's gender.

  8. Klinefelter Syndrome: Symptoms, Causes, Treatments, and More - ...

    www.healthline.com/health/klinefelter-syndrome

    Klinefelter syndrome is a genetic disease that causes biological males to be born with an extra copy of the X chromosome in their cells. Males with this condition may not have...

  9. Klinefelter syndrome - NHS

    www.nhs.uk/conditions/klinefelters-syndrome

    Causes of Klinefelter syndrome. 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.

  10. Klinefelter Syndrome - MedlinePlus

    medlineplus.gov/klinefeltersyndrome.html

    What causes Klinefelter syndrome (KS)? KS is not inherited. It's caused by a random error that happens when a sperm or egg is formed. This error causes a male to be born with an extra X chromosome. Chromosomes are tiny "packages" in your cells that contain your genes.

  11. What causes Klinefelter syndrome (KS)? | NICHD - NICHD - Eunice...

    www.nichd.nih.gov/health/topics/klinefelter/conditioninfo/causes

    What causes Klinefelter syndrome (KS)? The extra chromosome results from a random error that occurs when a sperm or egg is formed. This error causes an extra X chromosome to be included each time the cell divides to form new cells. In very rare cases, more than one extra X chromosome or an extra Y chromosome is included. En Español.