that's because the hypothalamus gland plays a big role in the the hypothalamus makes the hormone gonadotropin-releasingormone, or gnrh, which travels through the bloodstream to the pituitary gland. gnrh is actually responsible for the release of f.s.h. and l.h. in the pituitary. >> so, really, for there to be a problem with the sex hormones, the problem could be due to hypothalamus, pituitary, or the gonad itself. >> mcfarland: and that's how the two types of hypgonadism are determined. if the problem originates in the gonad, or testes, it's considered primary hypgonadism. if it originates in the pituitary or hypothalamus gland, it is secondary. though rare, there are other causes of hypgonadism that are chromosomal in nature. in boys, it's called klinefelter syndrome, where a problem exists within the chromosomes themselves, causing an extreme delay in puberty. still, other causes of hypgonadism can be directly related to medical issues. >> when i was 26 years old, i was diagnosed with testicular lymphoma. as a result of the lymphoma, i was required to undergo chemotherapy and radiation. >> mcfarland: