Stress and Anxiety: Understanding Their Relationship
Stress and anxiety are related but distinct experiences that commonly intersect in daily life and clinical settings. Stress refers to the body’s and mind’s response to external pressures or demands—such as deadlines, caregiving responsibilities, or major life changes (McEwen, 2007). It often involves identifiable triggers and can be acute or chronic. Physiological responses to stress include activation of the sympathetic nervous system, increased heart rate, and muscle tension (McEwen, 2007).
Anxiety, in contrast, is characterized by persistent worry, apprehension, or fear that may be disproportionate to identifiable threats (American Psychiatric Association, 2013). Anxiety can manifest as generalized worry, intrusive thoughts, anticipatory worry about future events, or specific fears (American Psychiatric Association, 2013). Physiological symptoms of anxiety can overlap with stress responses—racing heart, restlessness, and heightened vigilance—but anxiety often persists beyond the presence of immediate external stressors (American Psychiatric Association, 2013; Bandelow & Michaelis, 2015; McEwen, 2007).
The relationship between stress and anxiety is bidirectional. Prolonged or intense stress can precipitate anxiety symptoms by maintaining the body’s heightened arousal and reinforcing worrying cognitions (Bandelow & Michaelis, 2015). Conversely, preexisting anxiety can amplify perceived stress, making everyday demands feel more overwhelming and triggering stronger stress responses (Brosschot, Gerin, & Thayer, 2006). Neurobiological mechanisms—such as dysregulation of the hypothalamic-pituitary-adrenal axis and altered neural circuitry involving the amygdala and prefrontal cortex—may underlie this interplay (McEwen, 2007).
Clinicians distinguish situational stress from an anxiety disorder by evaluating how long symptoms have been present, how severe they are, the extent to which they disrupt daily functioning, and the specific response patterns involved. Many symptoms overlap—common difficulties can include poor sleep, trouble concentrating, heightened irritability, and persistently low mood (Bandelow & Michaelis, 2015; McEwen, 2007). Recognizing both distinctions and commonalities inform the process of conceptualizing cases as well as selection of appropriate evidence-based interventions.
References
American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). American Psychiatric Publishing.
Bandelow, B., & Michaelis, S. (2015). Epidemiology of anxiety disorders in the 21st century. Dialogues in Clinical Neuroscience
Brosschot, J. F., Gerin, W., & Thayer, J. F. (2006). The perseverative cognition hypothesis: A review of worry, prolonged stress-related physiological activation, and health. Journal of Psychosomatic Research
McEwen, B. S. (2007). Physiology and neurobiology of stress and adaptation: central role of the brain. Physiological Reviews
