Of all the hormones affecting male health, cortisol is perhaps the most underestimated. While testosterone commands most of the attention in conversations about men’s hormones, cortisol sits at the top of the hormonal hierarchy — and when it is chronically elevated, it quietly suppresses testosterone, drives abdominal fat gain, impairs sleep and erodes cognitive function.
The relationship between cortisol and testosterone is inverse and direct: the HPA axis (which drives cortisol production) and the HPG axis (which drives testosterone production) compete for resources and actively suppress one another. Chronically elevated cortisol reduces LH output from the pituitary, directly limiting testosterone synthesis in the Leydig cells of the testes. This is why men under sustained psychological or physical stress — whether from work pressure, overtraining, poor sleep or chronic illness — frequently present with low testosterone alongside elevated cortisol, even when no primary testicular dysfunction exists.
The stress response that cortisol drives is not inherently harmful. It is essential for survival. The cortisol awakening response — the natural spike in the first 30 minutes after waking — helps the body transition from sleep to activity. Without cortisol, men could not mobilise energy during a crisis, reduce dangerous inflammation, or regulate blood pressure. The problem arises when the modern world keeps the HPA axis in a state of near-constant activation — and the body pays the price across every system.
For South African men, the burden is significant. High rates of workplace stress, economic pressure, poor sleep quality and sedentary behaviour create fertile conditions for HPA dysregulation. Recognising cortisol’s role in male hormonal health — and addressing it through sleep, evidence-based stress management, appropriate exercise load and, where needed, clinical assessment — is one of the highest-impact interventions available to men wanting to optimise their health at any age.
