How Anxiety Leads to Depression

The Relationship Between Anxiety and Depression

For many years, anxiety disorders and depression were thought of as separate mental health conditions. While they are distinct diagnoses with different core symptoms, modern research has shown that they are interconnected. Anxiety and depression frequently occur together, share many of the same underlying risk factors, and often reinforce one another over time.¹

 

It is remarkable just how common this overlap is. Approximately half of individuals diagnosed with Generalized Anxiety Disorder (GAD) will experience Major Depressive Disorder (MDD) at some point during their lives, and a similar proportion of people with depression have a lifetime history of an anxiety disorder.²

Anxiety Can Lead to Depression

Research suggests that anxiety often comes first. Longitudinal studies following people over many years have found that anxiety disorders—particularly GAD—frequently precede the onset of depression.³ One explanation is that living in a prolonged state of excessive worry gradually takes a toll. Chronic anxiety is associated with persistent muscle tension, disrupted sleep, fatigue, difficulty concentrating, and heightened stress. Over time, constantly anticipating problems and feeling unable to relax can leave a person emotionally exhausted, increasing vulnerability to depression.

 

There are other ways that anxiety leads to depression. In the behavioral realm – anxiety can lead people to avoid challenging situations, withdraw socially, postpone decisions, or give up activities they once enjoyed. These behaviors may temporarily reduce anxiety, but they also decrease opportunities for enjoyment, accomplishment, and connection with others—all of which are protective against depression. In the cognitive realm – chronic worry can erode a person’s confidence in their ability to cope with life’s challenges. This contributes to feelings of helplessness and hopelessness that are characteristic of depression.

 

It can work the other way too, though. Once depression develops, symptoms such as low motivation, fatigue, and reduced activity can create more time for worry that leads to anxiety.

Similarities of Anxiety and Depression

Scientists have also discovered that anxiety and depression share many of the same underlying biological vulnerabilities. Studies suggest that many of the same genetic factors increase the likelihood of developing either condition.⁴ Brain imaging research has also identified overlapping differences in neural circuits involved in emotion regulation, threat detection, and cognitive control.⁵ In addition, both disorders are associated with dysregulation of neurotransmitter systems—including serotonin and norepinephrine—which helps explain why many of the same medications are effective for treating both anxiety and depression.

 

There are also similarities between anxiety and depression in the way people think. Individuals with GAD often become trapped in cycles of excessive worry about future events, while those with depression are more likely to engage in rumination about past events or perceived personal shortcomings. Although worry and rumination differ in their focus, both involve repetitive negative thinking that prolongs emotional distress and makes it difficult to disengage from painful thoughts6

Treatment

Because of the connections between anxiety and depression, effective treatment often improves both conditions simultaneously. Evidence-based therapies such as Cognitive Behavioral Therapy (CBT), Acceptance and Commitment Therapy (ACT), mindfulness-based interventions, and Behavioral Activation have all been shown to reduce symptoms of both anxiety and depression.7

References
  1. Diagnostic and Statistical Manual of Mental Disorders. American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.). Washington, DC: American Psychiatric Association.

  2. Ronald C. Kessler, Chiu WT, Demler O, Walters EE. (2005). Prevalence, severity, and comorbidity of DSM-IV disorders in the National Comorbidity Survey Replication. Archives of General Psychiatry, 62(6), 617–627.

  3. David H. Barlow. (2002). Anxiety and Its Disorders (2nd ed.). New York: Guilford Press.

  4. Kenneth S. Kendler, Gardner CO, Gatz M, Pedersen NL. (2007). The sources of co-morbidity between major depression and generalized anxiety disorder in a Swedish national twin sample. Psychological Medicine, 37(3), 453–462.

  5. Michelle G. Craske & Stein MB. (2016). Anxiety. The Lancet, 388(10063), 3048–3059.

  6. Susan Nolen-Hoeksema, Wisco BE, Lyubomirsky S. (2008). Rethinking Rumination. Perspectives on Psychological Science, 3(5), 400–424.

  7. National Institute for Health and Care Excellence. Generalised anxiety disorder and panic disorder in adults: management (CG113); and American Psychological Association. Clinical Practice Guideline for the Treatment of Depression.
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    This post is for informational purposes only and is not a substitute for professional mental health treatment. If you’re struggling, please seek support from a licensed mental health provider.