Epidemiology of Common Mental Disorders
Summary
The epidemiology of common mental disorders encompasses the study of the distribution, determinants and impact of conditions such as depression, anxiety disorders, bipolar disorder, obsessive–compulsive disorder and post-traumatic stress disorder within populations. Global surveys indicate that one in every five individuals will experience a common mental disorder in their lifetime, with notable variation across regions and demographic groups. These disorders are typically assessed through population-based surveys using standardised diagnostic interviews or screening tools, enabling estimation of prevalence, incidence and burden measured in years lived with disability (YLDs) and disability-adjusted life years (DALYs). Demographic factors such as age, sex, socioeconomic status and urbanisation interact with genetic predisposition and environmental stressors to shape risk profiles. Comorbidity between anxiety and depressive disorders is common, often compounding functional impairment and care needs. Longitudinal studies have shown that quality of life frequently deteriorates prior to disorder onset, declines further during active illness, and recovers partially with remission, although levels may remain below those of unaffected individuals. Recognition of global and local patterns has informed public health strategies, emphasising early detection, integration of mental health into primary care and culturally tailored interventions to reduce treatment gaps.
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Epidemiology of Common Mental Disorders publication trend
The graph below shows the total number of articles in epidemiology of common mental disorders across all publications each year (not limited to Nature Index journals).
Technical terms
Prevalence: The proportion of a population with a specified disorder at a given point or period in time.
Incidence: The rate of new cases of a disorder occurring in a defined population over a specified period.
Years Lived with Disability (YLDs): A measure combining prevalence with a disability weight to quantify non-fatal burden.
Disability-Adjusted Life Years (DALYs): A summary measure of overall disease burden, calculated as the sum of YLDs and years of life lost due to premature mortality.
Meta-regression: A statistical technique that examines how study-level characteristics explain variation in effect estimates across multiple studies.
References
- Factors associated with depressive symptoms among returnee migrants and non-migrants working adults in Madi municipality in Nepal: a community-based cross-sectional study. BMC Public Health (2024).
- The burden of mental disorders across the states of India: the Global Burden of Disease Study 1990–2017. The Lancet Psychiatry (2019).
- Prevalence of Common Mental Disorders in South Asia: A Systematic Review and Meta-Regression Analysis. Frontiers in Psychiatry (2020).
- Anxiety, Depression and Quality of Life—A Systematic Review of Evidence from Longitudinal Observational Studies. International Journal of Environmental Research and Public Health (2021).
About these summaries
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