hypogonadism

Hypogonadism is a medical term for decreased functional activity of the gonads, thus resulting in lower amounts of testosterone.

Low testosterone is caused by a decline or deficiency in gonadal production of testosterone in males. The gonads, typically called testicles in males, produce hormones (testosterone, estradiol, antimullerian hormone, progesterone, inhibin B, activin) and gametes or sperm.