Those with XXY are more likely than others to have certain health problems, such as autoimmune disorders, breast cancer, venous thromboembolic disease, and osteoporosis.

Oct 29, 2024 · Klinefelter syndrome is a genetic condition that occurs before birth, but it often isn't diagnosed until adulthood. Klinefelter syndrome may affect testicular growth. This results in smaller …

Mar 4, 2025 · What is XXY syndrome? XXY syndrome, also known as Klinefelter syndrome (KS), is a genetic condition characterized by the presence of an extra X chromosome (47, XXY). Humans have …

Oct 28, 2024 · 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, 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 …

Oct 9, 2023 · What is Klinefelter syndrome? Klinefelter syndrome is a genetic disorder in which males have an additional X chromosome in their genetic code. Most males have 46 chromosomes …

Most men are born with a pair of XY chromosomes, while most females are born with pair of XX chromosomes. Klinefelter syndrome occurs when a male is born with an extra X chromosome. Thus …

Discover real-life stories, tools, and hope from the XXY community. We’re reshaping the narrative around Klinefelter syndrome through empathy, connection, and lived truths. We share real …

XXY occurs when a male has an extra X chromosome in some or all cells of his body. About 1 out of every 660 males is born with XXY, and there about 300,000 with this condition in the U.S. 1,2. The …

Rather than the usual pattern of 46 chromosomes, with one X chromosome and one Y chromosome, there is an additional X chromosome, resulting in a genetic signature of 47,XXY.