Adrenal fatigue involves which physiological axis?

• A. HPA Axis
• B. HPT Axis
• C. HCG Axis
• D. HPO Axis

Answer: (A)

The question is about which hormonal pathway controls the adrenal glands and the body’s response to stress. Adrenal function and its regulation by stress sit squarely within the hypothalamic–pituitary–adrenal (HPA) axis. The hypothalamus releases corticotropin-releasing hormone, which tells the pituitary to secrete adrenocorticotropic hormone. ACTH then stimulates the adrenal cortex to produce cortisol. This axis helps mobilize energy, regulate inflammation, and manage stress signals. When stress is chronic, this system can become dysregulated, which is often described in discussions of adrenal fatigue, hence the association with the HPA axis.

The other axes involve different systems: the hypothalamic–pituitary–thyroid (HPT) axis governs thyroid hormones; the hypothalamic–pituitary–ovarian (HPO) axis coordinates reproductive hormones; and there isn’t a standard HCG axis used to describe adrenal regulation.