Chronic stress is defined as the prolonged or repeated activation of the body’s stress response system, which significantly exceeds the physiological capacity for recovery and adaptation. This sustained allostatic load results in dysregulation of the hypothalamic-pituitary-adrenal or HPA axis, leading to systemic hormonal imbalances. Clinically, it is a significant contributor to numerous metabolic, immune, and mental health disorders.
Origin
The term “stress” was popularized in endocrinology by Hans Selye, who described the body’s non-specific response to any demand for change, originally calling it the General Adaptation Syndrome. The qualifier “chronic” specifies the long-term, pathological nature of this sustained physiological demand. This concept is central to psychoneuroendocrinology.
Mechanism
The persistent presence of a stressor triggers the continuous release of glucocorticoids, primarily cortisol, from the adrenal cortex. Elevated cortisol levels eventually lead to glucocorticoid receptor desensitization and HPA axis exhaustion, impairing feedback loops. This sustained hormonal excess negatively impacts immune function, metabolic homeostasis, and the circadian rhythm, fundamentally altering the body’s regulatory set points.
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