Question

define depression

Answer 1

Brief, general definition
- Depression is a mood disorder characterized by persistent low mood, loss of interest or pleasure, and other emotional, cognitive, physical and behavioral symptoms that interfere with daily functioning.

Clinical (DSM-5) definition of Major Depressive Disorder (MDD)
- A major depressive episode requires at least five of the following symptoms present nearly every day for at least two weeks, with at least one of the symptoms being depressed mood or markedly diminished interest/pleasure:
1. Depressed mood (sad, empty, hopeless)
2. Markedly reduced interest or pleasure in activities (anhedonia)
3. Significant weight loss or gain, or appetite changes
4. Insomnia or hypersomnia
5. Psychomotor agitation or retardation
6. Fatigue or loss of energy
7. Feelings of worthlessness or excessive/inappropriate guilt
8. Diminished ability to think or concentrate, or indecisiveness
9. Recurrent thoughts of death, suicidal ideation, or suicide attempt
- Symptoms must cause clinically significant distress or impairment and not be better explained by another medical condition, substance use, or bereavement rules in specific contexts.

Other common forms
- Persistent depressive disorder (dysthymia): chronic, milder depressive symptoms lasting two years or more.
- Seasonal affective disorder: depressive episodes that follow a seasonal pattern (often winter).
- Postpartum depression: depression occurring after childbirth (varies in timing and severity).
- Situational or adjustment-related depressive symptoms: transient depressive reactions to life events.

Causes and risk factors
- No single cause; typically a combination of genetic vulnerability, brain chemistry and circuitry, hormonal factors, chronic medical illness, substance use, stressful life events, and psychosocial factors (isolation, trauma).

Impact and prevalence
- Depression is common and a leading cause of disability worldwide. It affects thoughts, behavior, physical health, work/school performance, relationships and quality of life.

Treatment and prognosis
- Depression is treatable. Effective options include psychotherapy (e.g., cognitive behavioral therapy, interpersonal therapy), antidepressant medications (SSRIs, SNRIs, others), lifestyle changes (sleep, exercise, diet), and for treatment-resistant cases, options such as electroconvulsive therapy, repetitive transcranial magnetic stimulation, or newer treatments (e.g., ketamine under supervision).
- Many people recover or substantially improve with appropriate treatment, though some need long-term management.

When to seek help
- See a primary care provider, mental health professional, or urgent care if you have persistent depressive symptoms.
- Seek immediate help if you have thoughts of harming yourself or others. If you are in immediate danger, call emergency services. If you are in the U.S., you can call or text 988 for the Suicide & Crisis Lifeline; if you’re elsewhere, contact local emergency services or your country’s crisis line.

If you want, I can:
- Provide the full DSM-5 criteria in text form.
- Show a brief self-screening tool (PHQ-9).
- Help you find local resources or crisis numbers.