Hypogonadism takes place when the testicles are not secreting enough testosterone. Testosterone is key to the health and development of males, including muscle mass, strength bone mass, fat distribution, sex drive, and sperm count.

Symptoms include: Erectile dysfunction, infertility, decreasing levels of muscle mass and increase body fat, loss of hair on head and beard and increasing body hair, and emotional symptoms including depression, mood swings, and fatigue.

Causes can be wide ranging, from too much iron in the blood to natural aging. Other causes include side-effects of medication, pituitary disorders, Klinefelter’s syndrome, and some cancer treatments. Treatment varies but usually includes either testosterone replacement therapy or pituitary hormones, if it is determined that a disorder in the pituitary gland is causing the hypogonadism.