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Stress is the organism’s response to a stressor, which can be environmental or related to life circumstances.
Stress (physiological, biological, or psychological) is an organism’s response to a stressor—such as an environmental condition or a change in life circumstances. When stimuli disrupt an organism’s environment, multiple body systems respond, particularly in humans and most mammals via the autonomic nervous system (ANS) and the hypothalamic-pituitary-adrenal (HPA) axis. Well-known stress-related hormones include adrenaline and cortisol, which help coordinate short-term adaptation and influence many bodily functions (metabolic, psychological, and immunological). Through these mechanisms, stress can affect processes such as memory, reward, immune function, metabolism, and disease susceptibility. A stressor is the triggering demand or event that upsets homeostasis (the body’s equilibrium). Disruptions to psychological or physical equilibrium activate nervous, endocrine, and immune responses, producing physical changes with both short- and long-term effects. In psychology, stress can arise when situations are appraised as threatening or challenging, and chronic stressors—especially those that persist and require daily physiological activation—are more likely to contribute to health problems. Stress can also be conceptualized as potentially beneficial (eustress) when it enhances functioning, or harmful (distress) when it is persistent and not resolved through coping or adaptation.
Stress is the organism’s response to a stressor, which can be environmental or related to life circumstances.
In humans, major stress-response systems include the ANS (e.g., fight-or-flight via sympathetic activation) and the HPA axis (regulating cortisol).
A stressor disrupts homeostasis; the body’s attempts to restore equilibrium can produce short- and long-term effects, especially under chronic exposure.
Psychological stress depends on appraisal and coping resources, and stressors can be experienced as either eustress (beneficial) or distress (harmful).
Stress is an organism’s physiological, biological, or psychological response to a stressor such as an environmental condition or life change.
A stressor is the external or internal demand/event (e.g., environmental change or life circumstance) that triggers the organism’s stress response by disrupting equilibrium or homeostasis.
Homeostasis is the body’s steady-state equilibrium that is continually disrupted by internal and external stimuli and is a central reference point for understanding stress.
The HPA axis is a major neuroendocrine system that mediates stress responses by regulating cortisol release.
The autonomic nervous system is a major stress-response system that translates stress inputs into physiological reactions through sympathetic and parasympathetic activity.
Eustress is stress that is enjoyable or inspiring and generally has positive effects on energy, cardiovascular health, and cognitive functions.
Distress is persistent stress that is not resolved through coping or adaptation and can contribute to anxiety or withdrawal behaviors.
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