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Stress is an organism’s response to a stressor that disrupts environmental conditions or 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 stressors disrupt an organism’s equilibrium, multiple body systems respond, including in humans and most mammals the autonomic nervous system (ANS) and the hypothalamic-pituitary-adrenal (HPA) axis. Key hormones involved include adrenaline and cortisol, which help coordinate short-term adaptation and longer-term regulation of bodily functions. Stressors are the stimuli or demands that trigger these responses. They can be acute (intense but shorter-lived) or chronic (persisting over longer periods), and chronic stressors are often more harmful because they require repeated physiological activation. In psychology, stressors can contribute to anxiety, depression, and other disorders, especially when coping resources are limited. Stress is also linked to the biological need for equilibrium (homeostasis): disruptions that push the body away from its optimal functioning can be experienced as stress, while attempts to restore balance can also involve stress-related physiological demands.
Stress is an organism’s response to a stressor that disrupts environmental conditions or life circumstances.
In humans, major stress-response systems include the ANS (e.g., fight-or-flight) and the HPA axis (e.g., cortisol regulation).
Stressors can be acute or chronic; chronic stressors tend to have greater negative health effects due to sustained activation.
Stress is closely tied to maintaining or restoring homeostasis, and persistent disruption can contribute to illness risk.
Stress is an organism’s physiological, biological, or psychological response to a stressor such as an environmental condition or life change.
A stressor is a stimulus or demand (environmental or situational) that triggers the body’s stress response.
Homeostasis is the body’s tendency to maintain a stable internal equilibrium, which stressors can disrupt.
The ANS is a major stress-response system that coordinates rapid, reflexive changes in the body, including fight-or-flight and return-to-homeostasis functions.
The HPA axis is a neuroendocrine system that regulates stress responses by controlling the release of cortisol.
Adrenaline is a hormone released during stressful situations that supports acute adaptation, often via fight-or-flight mechanisms.
Cortisol is a hormone regulated by the HPA axis that influences many bodily functions, including metabolic, psychological, and immune processes.
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