Depression and Anxiety Disorders

Depressive and anxiety disorders are the most common internalizing conditions of adolescence, marked respectively by persistent low mood and loss of interest, and by excessive fear or worry. They frequently co-occur, often first appear during the teenage years, and can carry forward into adult mental illness, which makes their recognition a core concern of adolescent health.

Definition

Adolescent depressive disorders are characterized by a sustained period of depressed or irritable mood and/or loss of interest with associated cognitive and physical symptoms, while anxiety disorders are characterized by excessive, persistent fear or worry that impairs functioning; both are classified as internalizing disorders.

Scope

This entry covers the clinical concept, epidemiology, and recognized features of adolescent depression and anxiety disorders, and the broad evidence base around their assessment and management. It is reference-educational: it describes how these conditions are defined and studied, not how to treat an individual patient.

Core questions

• How do depression and anxiety present in adolescents, and how do presentations differ from those in adults?
• How commonly do these disorders co-occur, and why?
• What screening and evidence-based approaches are recognized for adolescent depression and anxiety?

Key concepts

• Internalizing disorders
• Major depressive disorder
• Generalized, social, and separation anxiety
• Comorbidity of depression and anxiety
• Continuity into adult disorder
• Screening in primary care
• Cognitive-behavioral therapy and pharmacotherapy as studied modalities

Mechanisms

Adolescent depression and anxiety arise from an interaction of genetic vulnerability, temperament, stressful life events, and developmental changes in brain circuits governing emotion regulation and threat response. Family history confers substantial risk, and the two conditions share risk factors and frequently co-occur, with anxiety in childhood often preceding later depression. These accounts describe associations studied in the literature rather than a deterministic pathway.

Clinical relevance

Depression and anxiety in adolescents are linked to impaired school and social functioning and to elevated risk of self-harm and suicidal behavior, and they often persist or recur. The entry describes recognized screening and treatment evidence (such as cognitive-behavioral therapy and selected antidepressant trials) as background on how the conditions are studied; it provides no dosing or individualized treatment guidance.

Epidemiology

Anxiety disorders are among the earliest-onset and most prevalent mental disorders of childhood and adolescence, while depressive disorders rise sharply across the teenage years, with a marked increase in females after puberty. National adolescent survey data find substantial lifetime prevalence for both anxiety and mood disorders, and the two are highly comorbid.

History

Adolescent depression was historically under-recognized, on the assumption that mood disturbance in youth was developmentally normal. Large randomized trials in the 2000s, notably the Treatment for Adolescents with Depression Study (TADS) for depression and the Child/Adolescent Anxiety Multimodal Study (CAMS, reported by Walkup and colleagues) for anxiety, established an evidence base for combined psychological and pharmacological treatment and shaped subsequent practice guidelines.

Debates

Antidepressant use in adolescents and suicidality

Concern over a possible increase in suicidal ideation with antidepressants in young people prompted regulatory warnings and an ongoing discussion about balancing treatment benefit against this signal; trial evidence is weighed against the risks of untreated depression.

Key figures

• Anita Thapar
• John Walkup
• John March
• Boris Birmaher

Seminal works

• thapar-2012
• tads-2004
• walkup-2008

Frequently asked questions

Are depression and anxiety in adolescents related?

Yes. They share risk factors and frequently co-occur, and childhood anxiety often precedes later depression; both are grouped as internalizing disorders.

Do adolescent depression and anxiety continue into adulthood?

They often do. Adolescent-onset depression and anxiety are associated with increased risk of recurrent or persistent mental disorder in adulthood, which is part of why early recognition is emphasized.