The Link Between Stress Arousal and Anxiety Intensity

Individuals with higher baseline stress arousal (heightened physiological reactivity: cortisol, norepinephrine, amygdala sensitivity) exhibit amplified and prolonged anxiety responses to stressors.

This reflects a lower threshold for threat perception and impaired fear extinction. Chronic stress sensitizes the HPA axis and limbic circuits, creating a feed-forward loop: stress → anxiety → more stress.

Clinical Implication

Interventions that lower tonic arousal—mindfulness, aerobic exercise, CBT, adequate sleep, reducing stimulants—can “reset” the gain on anxiety responses, making stressors more manageable.