Depression (mood)

Depression (mood)
Name	Depression (mood)
Field	Psychiatry, psychology, neuroscience
Symptoms	Persistent low mood, anhedonia, sleep disturbance, appetite change
Complications	Suicide, functional impairment, comorbidity
Onset	Any age (common in adolescence, adulthood)
Causes	Biological, psychological, social factors
Treatment	Psychotherapy, pharmacotherapy, neuromodulation, psychosocial interventions

Depression (mood) Depression (mood) is a persistent low affective state characterized by sadness, diminished interest, and reduced energy that impairs functioning. It is recognized across clinical systems such as the Diagnostic and Statistical Manual of Mental Disorders and the International Classification of Diseases and is a focus of research in psychiatry, psychology, and neuroscience. Presentation, course, and response to interventions vary across individuals and populations.

Definition and terminology

Clinical taxonomies like the Diagnostic and Statistical Manual of Mental Disorders and the International Classification of Diseases define depressive syndromes with specified duration and symptom clusters. Terms historically used include melancholia and dysthymia; modern nosologies differentiate major depressive episodes, persistent depressive disorder, and bipolar depressions linked to concepts in Kraepelin, Freud, and later researchers. Subtypes—atypical, melancholic, psychotic, peripartum—have been delineated in landmark publications and guideline bodies such as the World Health Organization and national psychiatric associations including the American Psychiatric Association.

Signs and symptoms

Core manifestations include pervasive low mood, loss of interest or pleasure, fatigue, and cognitive changes such as impaired concentration and indecisiveness described in clinical texts by figures like Sigmund Freud, Emil Kraepelin, and contemporary authors affiliated with institutions like Johns Hopkins University and Harvard Medical School. Neurovegetative signs include sleep disturbance and appetite or weight changes referenced in guides from the National Institute of Mental Health and treatment manuals used at centers such as Mayo Clinic and Cleveland Clinic. Severe presentations can involve suicidal ideation, psychomotor changes, or psychosis documented in case series from hospitals such as Massachusetts General Hospital and research by teams at University College London and the University of Oxford.

Causes and risk factors

Etiology is multifactorial: genetic influences identified in genome-wide studies from groups at Stanford University, Broad Institute, and King's College London interact with neurobiological mechanisms in circuits studied at institutions like the Max Planck Society and Cold Spring Harbor Laboratory. Environmental risk factors include adverse childhood experiences examined in cohorts from Duke University and University of California, Los Angeles, life stressors reported in epidemiologic work by the World Health Organization and national surveys such as those by the Centers for Disease Control and Prevention. Medical comorbidity with conditions treated at centers like Johns Hopkins Hospital and Mount Sinai Hospital elevates risk; socioeconomic determinants have been evaluated by researchers at London School of Economics and University of Toronto.

Diagnosis and assessment

Diagnosis relies on clinical interview, structured instruments such as the Structured Clinical Interview developed at Columbia University and rating scales like the Hamilton Depression Rating Scale from research groups at McLean Hospital and the Beck Depression Inventory originating from University of Pennsylvania. Assessment integrates mental status examination practiced in teaching hospitals including Charité – Universitätsmedizin Berlin and neuroimaging or biomarkers explored at centers like Massachusetts General Hospital and the National Institutes of Health. Differential diagnosis considers bipolar disorder, substance-related disorders, and medical conditions described in textbooks from publishers such as Oxford University Press and Cambridge University Press.

Treatment and management

Evidence-based treatments include psychotherapies (cognitive behavioral therapy developed at University of Pennsylvania, interpersonal therapy pioneered by clinicians linked to Yale University), pharmacotherapies such as selective serotonin reuptake inhibitors studied at pharmaceutical research centers and trials coordinated by organizations like the National Institute for Health and Care Excellence, and neuromodulation techniques including electroconvulsive therapy performed at hospitals such as West London NHS Trust and transcranial magnetic stimulation researched at Beth Israel Deaconess Medical Center. Stepped-care and collaborative care models have been implemented in health systems including the Veterans Health Administration and national programs in Sweden and Australia. Crisis interventions and suicide prevention strategies have been shaped by agencies like the World Health Organization and advocacy groups including Mental Health America.

Epidemiology and impact

Global burden estimates from the World Health Organization and the Global Burden of Disease study at the Institute for Health Metrics and Evaluation rank depressive disorders among leading causes of disability in regions studied by teams at Harvard T.H. Chan School of Public Health and the London School of Hygiene & Tropical Medicine. Prevalence varies by country in surveys such as those by the Centers for Disease Control and Prevention and the European Commission; incidence and recurrence have been characterized in long-term cohorts from institutions like Kaiser Permanente and Framingham Heart Study affiliates. Economic, social, and occupational impacts have been analyzed by researchers at World Bank and universities including Columbia University.

History and cultural perspectives

Descriptions date to classical authors and medieval physicians; modern clinical concepts evolved through contributions by Philippe Pinel, Jean-Martin Charcot, and Emil Kraepelin at institutions such as Hôpital Salpêtrière and University of Leipzig. Cultural interpretations and stigma vary globally, studied by anthropologists and psychiatrists at universities including University of Tokyo, University of Cape Town, and National University of Singapore. Artistic depictions—by figures like Vincent van Gogh, Sylvia Plath, and Amedeo Modigliani—and literary portrayals in works by Fyodor Dostoevsky, Virginia Woolf, and Ernest Hemingway have influenced public understanding and discourse, paralleled by advocacy movements led by organizations like Mind and Rethink Mental Illness.

Category:Mood disorders