Therapeutic Approaches for Seasonal Affective Disorder

Seasonal Affective Disorder (SAD) is a recurrent form of depression characterised by predictable onset in specific seasons, most often autumn and winter, but occasionally spring or early summer. Core symptoms include low mood, increased sleep duration, carbohydrate craving and social withdrawal. First-line interventions target maladaptive entrainment of the internal clock and neurotransmitter imbalances. Bright light therapy delivers high-intensity light to compensate for reduced daylight, thereby regulating melatonin secretion and stabilising mood. Cognitive–behavioural therapy tailored for SAD (CBT-SAD) addresses negative thought patterns and behavioural avoidance, with evidence of enduring prophylactic effects. Pharmacological options include antidepressant agents such as selective serotonin reuptake inhibitors and melatonin agonists, used alone or alongside light therapy for synergistic benefit. Adjunctive strategies—Vitamin D supplementation, lifestyle modification centred on outdoor activity and sleep hygiene—support circadian realignment. Emerging neuromodulation techniques, including repetitive transcranial magnetic stimulation, and precision approaches informed by mobile health monitoring are under investigation. Globally, these therapies underpin public health strategies in high-latitude regions and inform year-round depression management in primary care settings.

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Therapeutic Approaches for Seasonal Affective Disorder publication trend

The graph below shows the total number of articles in therapeutic approaches for seasonal affective disorder across all publications each year (not limited to Nature Index journals).

Technical terms

Bright light therapy: Controlled exposure to high-intensity artificial light to correct circadian misalignment and suppress excessive melatonin production.

Cognitive–behavioural therapy (CBT): A psychotherapeutic approach that modifies dysfunctional thoughts and behaviours linked to seasonal mood changes.

Circadian rhythm: The endogenous 24-hour cycle of physiological processes, including sleep–wake patterns, that can be disrupted in SAD.

Seasonal Pattern Assessment Questionnaire (SPAQ): A validated self-report instrument measuring mood and behaviour shifts across seasons to screen for SAD.

Subsyndromal SAD: A milder form of seasonal mood disturbance, often termed “winter blues,” lacking full diagnostic criteria for major depressive episodes.

References

1. Seasonal Affective Disorder: An Overview of Assessment and Treatment Approaches. Depression Research and Treatment (2015).
2. Assessing seasonal and weather effects on depression and physical activity using mobile health data. npj Mental Health Research (2025).