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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
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Related Experiment Video

Updated: Jan 4, 2026

Using a Murine Model of Psychosocial Stress in Pregnancy as a Translationally Relevant Paradigm for Psychiatric Disorders in Mothers and Infants
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The reproductive stress hypothesis.

Lixin Wen1,2, Rongfang Li1,2, Ji Wang1,2

  • 1Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Hunan Agricultural University, Changsha, People's Republic of China.

Reproduction (Cambridge, England)
|November 3, 2019
PubMed
Summary

The reproductive stress hypothesis explains how pregnancy triggers specific physiological stress responses in females. Understanding these reproductive stress mechanisms is key to preventing pregnancy-related health issues.

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Area of Science:

  • Reproductive biology
  • Endocrinology
  • Stress physiology

Background:

  • Reproductive events in females activate the hypothalamic-pituitary-adrenal axis and sympathetic adrenomedullary system.
  • Pregnancy involves complex physiological changes and stress responses in the female.
  • Existing knowledge lacks a comprehensive framework for understanding reproductive stress.

Purpose of the Study:

  • To propose the "reproductive stress hypothesis" to explain female responses to reproductive events.
  • To define and categorize different types of reproductive stress.
  • To explore the implications of reproductive stress on reproductive health and disease.

Main Methods:

  • Conceptual framework development based on existing literature.
  • Description of the hypothalamic-pituitary-adrenal axis and sympathetic adrenomedullary system activation.
  • Categorization of reproductive stress into active, passive, and fetal intrauterine stress.

Main Results:

  • Reproductive events (empathy, pregnancy, parturition, lactation) induce "active reproductive stress."
  • Fetal factors (hormones) cause "passive reproductive stress" in pregnant females.
  • Uterine tension and infection trigger "fetal intrauterine stress."

Conclusions:

  • Appropriate reproductive stress is essential for normal reproduction.
  • Excessive or inappropriate reproductive stress can lead to reproductive dysfunction and disease susceptibility.
  • The reproductive stress hypothesis offers insights into the pathogenesis of diseases in pregnant animals and humans.