Major Depressive Disorder (MDD)
An authoritative clinical profile of Major Depressive Disorder covering CANMAT 2016 guidelines, monoaminergic neurobiology, active suicidal crisis emergency red flags, and antidepressant non-discontinuation safety boundaries.
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Quick Reference Facts
Evidence Summary
- •Monoaminergic (serotonin, norepinephrine, dopamine) neurotransmitter deficits and neuroendocrine HPA-axis hyperreactivity [D0020-KEYNOTES, CIT-0051]
- •Genetic vulnerability combined with environmental stressors, trauma, or chronic medical illness
- •Organic neurological/endocrine conditions (hypothyroidism, B12 deficiency, stroke, Parkinson's disease)
Disease Progression Timeline
Risk Factors & Triggers
Underlying clinical predispositions, familial autoimmune markers, genetic anomalies, or environmental catalysts that establish susceptibility.
Clinical Pearl: Early screening of relatives with similar patterns is highly recommended.
Clinical Overview
Major Depressive Disorder (MDD) is a mood disorder characterized by persistent depressed mood, anhedonia (loss of interest/pleasure), psychomotor changes, and cognitive impairment lasting ≥2 weeks [D0020-KEYNOTES, CIT-0051]. CANMAT 2016 categorizes mild, moderate, and severe episodes.
A psychiatric mood disorder involving persistent depressed mood or loss of interest alongside neurovegetative, cognitive, and psychomotor symptoms causing marked functional impairment.
Pathological Causes
- Monoaminergic (serotonin, norepinephrine, dopamine) neurotransmitter deficits and neuroendocrine HPA-axis hyperreactivity [D0020-KEYNOTES, CIT-0051]
- Genetic vulnerability combined with environmental stressors, trauma, or chronic medical illness
- Organic neurological/endocrine conditions (hypothyroidism, B12 deficiency, stroke, Parkinson's disease)
Risk Factors
- Family history of mood disorders or completed suicide
- Female sex, chronic pain/medical illness, social isolation, and severe life events (bereavement, job loss)
- Substance use disorders or heavy alcohol abuse
Clinical Symptom Presentation
- Persistent sad, empty, or anxious mood, and marked anhedonia in previously enjoyed activities [D0020-KEYNOTES, CIT-0051]
- Significant weight loss/gain, insomnia or hypersomnia, and psychomotor agitation or retardation
- Fatigue, feelings of worthlessness/excessive guilt, impaired concentration, and recurrent suicidal thoughts
Diagnostic Evaluation
Investigation Protocol
Diagnosed via DSM-5-TR or ICD-11 criteria (≥5 of 9 symptoms including depressed mood or anhedonia), PHQ-9 psychometric rating scale, and laboratory screening (TSH, B12/folate, CBC) to exclude organic etiologies [CIT-0051].
Differential Diagnosis
Differentiate MDD from Bipolar Affective Disorder (hypomanic/manic history), Persistent Depressive Disorder (Dysthymia), Hypothyroidism, Adjustment Disorder with Depressed Mood, and Bereavement.
Differential Diagnosis Matrix
Differentiate MDD from Bipolar Affective Disorder (hypomanic/manic history), Persistent Depressive Disorder (Dysthymia), Hypothyroidism, Adjustment Disorder with Depressed Mood, and Bereavement.
Treatment Approaches
Conventional Management
Management includes evidence-based psychotherapy (CBT, Interpersonal Therapy), first-line antidepressants (SSRIs - fluoxetine, escitalopram; SNRIs; bupropion), and electroconvulsive therapy (ECT) or rTMS for severe treatment-resistant or catatonic depression [CIT-0051].
Homeopathic Approach
Homeopathic remedies (such as Aurum Metallicum, Ignatia Amara, Natrum Muriaticum, Sepia, Pulsatilla) act as supportive constitutional therapy to address emotional grieving, despondency, and lethargy alongside professional psychiatric supervision.
Lifestyle & Diet Advice
Maintain regular sleep-wake schedules, engage in daily aerobic exercise (proven to stimulate BDNF), practice mindfulness, avoid alcohol/drugs, and stay connected with supportive family and friends.
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Reference Citations & Evidence Sources
Clinical Guidelines & Consensus Statements
Materia Medica & Keynotes
- CIT-0004Hahnemann S.. "Materia Medica Pura." Adolph Arnold (1811).
- CIT-0005Kent J. T.. "Lectures on Homoeopathic Materia Medica." Boericke & Tafel (1905).
- CIT-0006Boericke W.. "Pocket Manual of Homoeopathic Materia Medica." Boericke & Runyon (1901).
AI & Generative Search Citation Block
D0020Dr. Narayan Jethwani. "Major Depressive Disorder (MDD)." Homeo Healthcare Clinical Platform. Version 1.1.0. Reviewed: 2026-07-31T12:00:00Z. Available at: https://homeo.healthcare/knowledge/diseases/depression
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