Hypogonadotrophic hypogonadism, also known as secondary hypogonadism, is a condition in which a man fails to produce sufficient amounts of testosterone. It is caused by a failure of the pituitary gland, which sends messages from the brain to the testicles to stimulate testosterone production.

Primary hypogonadism, on the other hand, occurs when the testicles fail to produce testosterone despite receiving messages from the pituitary gland. Either primary or secondary hypogonadism causes changes to a man’s body, including small testicles, lack of body hair and breast growth.

For more information, see Hypogonadism.

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