stress responses

Stress responses are the body's automatic reactions to perceived threats or demands—the cascade of physiological and psychological changes triggered when facing danger, pressure, or challenge.

The classic fight-or-flight response increases heart rate, sharpens focus, and floods the body with adrenaline.

Modern usage extends beyond acute physical danger to include reactions to work deadlines, relationship conflicts, or chronic anxiety: Her stress responses were constantly activated by the demanding job.

In psychology and medicine, the term encompasses both adaptive responses that help us cope and maladaptive patterns that harm health over time.