Understanding the Stress Response Cycle
Definition of the Stress Response
A stressful situation — whether environmental or psychological — can trigger a cascade of stress hormones that produce physiological changes.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThese physiological changes may include a pounding heart, quickened breathing, muscle tension, and sweating.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThis combination of reactions is known as the fight-or-flight response, which evolved as a survival mechanism enabling humans to react quickly to life-threatening situations.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe body can also overreact to non-life-threatening stressors such as traffic jams, work pressure, and family difficulties.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseAny physical or psychological stimulus that disrupts homeostasis results in a stress response.
https://www.ncbi.nlm.nih.gov/books/NBK541120/These stimuli are called stressors, and the physiological and behavioural changes in response to them constitute the stress response.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The stress response is mediated through the interaction of the nervous, endocrine, and immune systems.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The stress response activates the sympathetic-adreno-medullary (SAM) axis and the hypothalamic-pituitary-adrenal (HPA) axis.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The stress response is adaptive in preparing the body to manage internal or external challenges.
https://www.ncbi.nlm.nih.gov/books/NBK541120/When stress is intense, repetitive, or prolonged, the response becomes maladaptive and harmful to physiological functioning.
https://www.ncbi.nlm.nih.gov/books/NBK541120/
🧠 Brain Initiation of the Stress Response
The stress response begins in the brain.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseInformation from the eyes or ears is sent to the amygdala for emotional processing.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe amygdala interprets sensory input and sends a distress signal to the hypothalamus when danger is perceived.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe hypothalamus functions as a command center that communicates with the body through the autonomic nervous system.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe autonomic nervous system regulates involuntary functions such as breathing, heartbeat, blood pressure, and blood vessel dilation.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe sympathetic nervous system activates the fight-or-flight response.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe parasympathetic nervous system promotes the “rest-and-digest” response after danger has passed.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-response
⚡ SAM Axis (Fast Stress Response)
The fast component of the stress response is mediated by the SAM axis.
https://www.ncbi.nlm.nih.gov/books/NBK541120/SAM axis activation increases secretion of epinephrine and norepinephrine.
https://www.ncbi.nlm.nih.gov/books/NBK541120/These hormones increase heart rate, blood pressure, oxygen consumption, and glucose availability.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Epinephrine increases pulse rate and breathing while directing blood to vital organs and muscles.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseSmall airways in the lungs open to allow more oxygen intake.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseEpinephrine triggers the release of glucose and fats into the bloodstream to supply energy.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-response
🧬 HPA Axis (Slow Stress Response)
The slower component of the stress response is mediated by the HPA axis.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The HPA axis consists of the hypothalamus, pituitary gland, and adrenal glands.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseThe hypothalamus releases corticotropin-releasing hormone (CRH).
https://www.ncbi.nlm.nih.gov/books/NBK541120/CRH stimulates the anterior pituitary gland to release adrenocorticotropic hormone (ACTH).
https://www.ncbi.nlm.nih.gov/books/NBK541120/ACTH stimulates the adrenal cortex to release cortisol.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Cortisol mobilizes energy stores and suppresses immune-inflammatory responses.
https://www.ncbi.nlm.nih.gov/books/NBK541120/When the threat passes, cortisol levels fall and the parasympathetic nervous system dampens the stress response.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-response
📌 Types of Stress
Acute stress results from immediate perceived challenges.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Chronic stress occurs when stressors persist over time.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Episodic acute stress involves frequent occurrences of acute stress.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Traumatic stress results from overwhelming events.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Environmental stress arises from adverse surroundings.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Psychological stress stems from perceived threats or worries.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Physiological stress occurs when illness or sleep deprivation disrupts homeostasis.
https://www.ncbi.nlm.nih.gov/books/NBK541120/
📌 Organ Systems Affected by Stress
Acute stress increases heart rate and redirects blood flow to skeletal muscles.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Chronic stress contributes to oxidative stress and inflammation.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Stress alters breathing patterns and may exacerbate respiratory symptoms.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Stress reduces gastrointestinal motility and blood flow to digestion.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Chronic stress may lead to muscle wasting and reduced bone density.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Long-term HPA axis activation suppresses immune responses.
https://www.ncbi.nlm.nih.gov/books/NBK541120/Chronic stress disrupts reproductive hormone regulation.
https://www.ncbi.nlm.nih.gov/books/NBK541120/
🔁 General Adaptation Syndrome (Stress Cycle)
The alarm stage represents the initial fight-or-flight response.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The resistance stage reflects adaptation to prolonged stress.
https://www.ncbi.nlm.nih.gov/books/NBK541120/The exhaustion stage results from sustained stress exposure.
https://www.ncbi.nlm.nih.gov/books/NBK541120/
📌 Stress vs Stressors
Stressors activate the body’s stress response.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleExamples include work demands, family responsibilities, discrimination, and trauma.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleStress is the physiological and neurological response to stressors.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleStress increases cardiovascular functioning and short-term thinking.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleDigestion and immune functioning are deprioritized during stress activation.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleIndividuals may resolve the stressor without resolving the physiological stress.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycle
🔄 Completing the Stress Response Cycle
The stress response cycle is a biological process that occurs when exposed to stress.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycleStress can occur in response to both positive and negative challenges.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycleThe body activates in response to a stressor and must later return to a resting state.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
🟢 Rest
The body begins in a rested state supported by sleep and nutrition.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
🔴 Activation
A stressor activates cortisol production to manage the challenge.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
🔵 Recovery
Recovery requires active steps to return the body to baseline functioning.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
⚠️ Effects of Chronic & Unresolved Stress
Chronic stress contributes to high blood pressure and heart disease.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseChronic stress may contribute to depression, anxiety, and addiction.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseElevated cortisol increases appetite and fat storage.
https://www.health.harvard.edu/staying-healthy/understanding-the-stress-responseProlonged stress increases cortisol and reduces empathy and decision-making.
https://hr.ubc.ca/working-ubc/news/october-10-2022/completing-stress-cycleFailure to complete the stress cycle may result in burnout or depression.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
🛠️ Techniques to Complete the Stress Cycle
Physical activity can regulate the stress response.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycleDeep breathing techniques support nervous system regulation.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cyclePositive social interaction may reduce stress activation.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycleLaughter and affection may reduce physiological stress activation.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycleCrying and creative expression may support emotional recovery.
https://healthcare.utah.edu/the-scope/health-library/all/2025/07/learn-how-complete-your-bodys-natural-stress-cycle
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