| Stress response type | Acute vs. chronic — key distinction (American Psychological Association) |
| Primary stress hormone | Cortisol (adrenal glands) (National Institutes of Health) |
| Rest-and-digest system | Parasympathetic nervous system (General neuroscience consensus) |
| Cumulative stress measure | Allostatic load (McEwen & Stellar, 1993 — foundational research) |
| Reappraisal strategy category | Cognitive (thought-level) coping (Gross, J.J. — emotion regulation research) |
| Breathing technique for calm | Diaphragmatic (belly) breathing (Broadly supported in relaxation literature) |
Why This Glossary Exists
Wellness articles are full of terms that sound precise but rarely get explained — cortisol, allostatic load, the parasympathetic nervous system. If you've ever nodded along while quietly wondering what something actually means, this reference is for you.
Think of it as a companion you can return to whenever you encounter unfamiliar language in stress or relaxation content. Understanding the vocabulary doesn't just satisfy curiosity; it helps you evaluate which strategies are rooted in evidence and which ones deserve more scrutiny. For a broader grounding in how stress affects the body and everyday life, see our complete everyday guide to stress relief.
This article is for informational purposes only and is not a substitute for medical advice. Always consult a qualified healthcare professional for personal health concerns.
Acute Stress
A short-lived stress response triggered by a specific, immediate demand — a deadline, a near-miss on the road, an argument. The body mobilises quickly and typically recovers once the demand passes. It is considered a normal part of life.
Chronic Stress
Ongoing activation of the stress response with insufficient recovery time between triggers. Unlike acute stress, chronic stress persists over weeks or months and is associated with a range of physical and psychological effects when left unmanaged.
Cortisol
A hormone released by the adrenal glands as part of the body's stress response. In short bursts, cortisol helps regulate blood sugar and energy. Chronically elevated cortisol levels, however, may disrupt sleep, immune function, and mood over time.
Allostatic Load
The cumulative 'wear and tear' on the body that results from repeated or prolonged stress responses. Researchers use allostatic load as a way to measure how much the body has had to adapt to stressors over time.
Sympathetic Nervous System
The branch of the autonomic nervous system responsible for the 'fight-or-flight' response. It accelerates heart rate, sharpens focus, and redirects energy to muscles — all useful in genuine emergencies, but taxing when activated chronically.
Parasympathetic Nervous System
The branch of the autonomic nervous system associated with rest, digestion, and recovery — sometimes called 'rest and digest.' Activating it intentionally through slow breathing or relaxation practices helps counterbalance the stress response.
HPA Axis
Short for the hypothalamic-pituitary-adrenal axis, this is the body's central stress-response system. When the brain perceives a threat, this axis triggers the release of stress hormones including cortisol. It is a key focus of stress physiology research.
Mindfulness
The practice of paying deliberate, non-judgmental attention to the present moment — thoughts, sensations, emotions, and environment. Research suggests regular mindfulness practice may reduce perceived stress and improve emotional regulation.
Diaphragmatic Breathing
A breathing technique that engages the diaphragm (the dome-shaped muscle beneath the lungs) rather than the chest. Often called 'belly breathing,' it tends to slow the breath, activate the parasympathetic nervous system, and reduce feelings of tension.
Cognitive Reappraisal
An emotion-regulation strategy in which a person consciously reframes how they interpret a stressful situation. Rather than changing the situation itself, reappraisal changes the meaning assigned to it — and is widely studied in psychological resilience research.
Rumination
The tendency to repeatedly replay distressing thoughts or past events without reaching resolution. Rumination is associated with heightened stress and is considered a risk factor for anxiety and depression in existing research.
Resilience
The capacity to adapt to, recover from, or grow through adversity and stress. Resilience is generally understood not as a fixed trait but as a dynamic capacity that can be supported through habits, social connection, and learned coping strategies.
How These Concepts Connect in Real Life
These terms rarely exist in isolation. Your autonomic nervous system is constantly toggling between sympathetic and parasympathetic states depending on how safe your brain perceives your environment to be. Repeated triggering of that sympathetic response — without adequate recovery — is how acute stress becomes chronic stress, and how chronic stress raises your allostatic load over time.
The good news: many evidence-informed habits work precisely because they nudge the nervous system toward its parasympathetic, rest-and-digest state. Deep breathing, consistent sleep, and deliberate pauses throughout your day all count. Our article on everyday micro-habits that quietly reduce stress explores practical ways to make this shift without overhauling your schedule.
| Stress response type | Acute vs. chronic — key distinction (American Psychological Association) |
| Primary stress hormone | Cortisol (adrenal glands) (National Institutes of Health) |
| Rest-and-digest system | Parasympathetic nervous system (General neuroscience consensus) |
| Cumulative stress measure | Allostatic load (McEwen & Stellar, 1993 — foundational research) |
| Reappraisal strategy category | Cognitive (thought-level) coping (Gross, J.J. — emotion regulation research) |
| Breathing technique for calm | Diaphragmatic (belly) breathing (Broadly supported in relaxation literature) |
If you find yourself wanting to track how these dynamics show up in your own experience, a structured daily check-in can be surprisingly revealing. The daily stress check-in framework offers a simple, repeatable process for doing exactly that.
For readers interested in how sustained stress management connects to longer-term health, our piece on stress management and chronic disease prevention examines the research with appropriate nuance. And if meditation terminology ever feels equally opaque, The Glossary Every New Meditator Should Bookmark covers that distinct vocabulary just as plainly.