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  2. Male infertility - Wikipedia

    en.wikipedia.org/wiki/Male_infertility

    The male infertility crisis is an increase in male infertility since the mid-1970s. [91] The issue attracted media attention after a 2017 meta-analysis found that sperm counts in Western countries had declined by 52.4 percent between 1973 and 2011.

  3. Klinefelter syndrome - Wikipedia

    en.wikipedia.org/wiki/Klinefelter_syndrome

    The rate of Klinefelter syndrome among infertile males is 3.1%. The syndrome is the main cause of male hypogonadism. [67] One survey in the United Kingdom found that the majority of people with KS identify as male, however, a significant number have a different gender identity. [68] The prevalence of KS is higher than expected in transgender ...

  4. XX male syndrome - Wikipedia

    en.wikipedia.org/wiki/XX_male_syndrome

    XX male syndrome, also known as de la Chapelle syndrome, is a rare intersex condition in which an individual with a 46,XX karyotype develops a male phenotype. [2] Synonyms for XX male syndrome include 46,XX testicular difference of sex development (or 46,XX DSD) [3] [4] [5] [6]

  5. Infertility - Wikipedia

    en.wikipedia.org/wiki/Infertility

    The main cause of male infertility is low semen quality. In men who have the necessary reproductive organs to procreate, infertility can be caused by low sperm count due to endocrine problems, drugs, radiation, or infection. There may be testicular malformations, hormone imbalance, or blockage of the man's duct system.

  6. Kallmann syndrome - Wikipedia

    en.wikipedia.org/wiki/Kallmann_syndrome

    [2] [3] [4] If left untreated, people will have poorly defined secondary sexual characteristics, show signs of hypogonadism, almost invariably are infertile and are at increased risk of developing osteoporosis. [2] A range of other physical symptoms affecting the face, hands and skeletal system can also occur. [3]

  7. Sertoli cell-only syndrome - Wikipedia

    en.wikipedia.org/wiki/Sertoli_cell-only_syndrome

    Infertility affects around 10% of US couples. Approximately 30% of these couples have a pure male factor as the underlying cause, whereas the remaining 20% have a male and female influence. Although specific data are difficult to get, SCO syndrome affects less than 5%-10% of the aforementioned infertile individuals. [4]

  8. The Ins & Outs of Male Pattern Baldness - AOL

    www.aol.com/lifestyle/ins-outs-male-pattern...

    DHT has an important job early on — it creates male sex organs in utero, and later, in puberty, it’s the hormone responsible for developing male characteristics like a deeper voice and body hair.

  9. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    A woman practicing symptoms-based fertility awareness may choose to observe one sign, two signs, or all three. Many women experience secondary fertility signs that correlate with certain phases of the menstrual cycle, such as abdominal pain and heaviness, back pain, breast tenderness, and mittelschmerz (ovulation pains).