What is secondary hypogonadism?

Secondary hypogonadism occurs when the pituitary gland or hypothalamus fails to produce or signal the release of hormones needed to trigger testosterone production in the testes. The testicles themselves are functioning normally, but they receive insufficient hormonal instruction to make adequate testosterone. This distinguishes it from primary hypogonadism, where the testicles are damaged or dysfunctional and cannot produce testosterone even when properly signaled.

Common causes include pituitary tumors, traumatic brain injury, medications that suppress the pituitary axis, obesity, diabetes, sleep disorders, and aging. Symptoms mirror those of primary hypogonadism: fatigue, reduced sexual function, mood changes, and decreased muscle mass. However, because the problem originates in the brain rather than the testicles, treatment approaches and underlying causes often differ.

Diagnosis requires blood tests measuring testosterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH). Low testosterone paired with low or normal LH and FSH levels typically points to secondary hypogonadism. This distinction matters clinically because addressing the root cause of pituitary or hypothalamic dysfunction may be possible, whereas primary hypogonadism usually requires direct testosterone replacement.

Men seeking testosterone replacement therapy should work with providers experienced in differentiating these forms, as the diagnosis guides both immediate treatment and investigation into underlying disease. TRT providers in Miami can order the appropriate tests to confirm secondary hypogonadism and determine the best course of action.