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Hypogonadism is a medical term for a defect of the reproductive system that results in lack of function of the gonads (ovaries or testes). The gonads have two functions: to produce hormones (testosterone, estradiol, antimullerian hormone, progesterone, inhibin B), activin and to produce gametes (eggs or sperm). Deficiency of sex hormones can result in defective primary or secondary sexual development, or withdrawal effects (e.g., premature menopause) in adults. Defective egg or sperm development results in infertility.
The term hypogonadism is usually applied to permanent rather than transient or reversible defects, and usually implies deficiency of reproductive hormones, with or without fertility defects. The term is less commonly used for infertility without hormone deficiency.
There are many possible types of hypogonadism and several ways to categorize them.
Hypogonadism can involve just hormone production or just fertility, but most commonly involves both.
Hypogonadism is also categorized by endocrinologists by the level of the reproductive system that is defective.
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