Diagnosing Depression After Relationship Breakup
Begin with the 2-item Patient Health Questionnaire (PHQ-2) screening, and if positive (score ≥2), proceed immediately to the full PHQ-9 to assess symptom severity and establish a formal diagnosis based on DSM-5 criteria. 1
Initial Screening Approach
Start by asking these two questions about the past 2 weeks 2, 3:
- "Have you felt down, depressed, or hopeless?"
- "Have you felt little interest or pleasure in doing things?"
Rate each as: 0 (not at all), 1 (several days), 2 (more than half the days), or 3 (nearly every day).
If the combined score is 0-1: No further screening needed at this time.
If the combined score is ≥2: Administer the full 9-item PHQ-9 immediately. 1
Diagnostic Assessment with PHQ-9
The PHQ-9 assesses the nine DSM-5 criteria for major depressive disorder over the past 2 weeks 1:
- Depressed mood or irritability
- Anhedonia (loss of interest/pleasure)
- Sleep disturbance (insomnia or hypersomnia)
- Fatigue or loss of energy
- Appetite/weight changes
- Low self-worth or guilt
- Concentration difficulties
- Psychomotor agitation or retardation
- Thoughts of self-harm
Interpreting PHQ-9 Scores
Score 1-7 (None/Mild): Minimal symptoms, effective coping skills present. Monitor but no immediate intervention required. 1
Score 8-14 (Moderate): Subthreshold depressive symptoms with mild-to-moderate functional impairment. Seek consultation with psychology or psychiatry for diagnostic determination. 1
Score 15-19 (Moderate-to-Severe) or 20-27 (Severe): Most depressive symptoms present with marked functional interference. Immediate referral to psychology and/or psychiatry for formal diagnosis and treatment. 1
Critical Safety Assessment
Always assess for suicidal ideation and risk of harm to self or others. If present, this requires immediate emergency psychiatric evaluation, one-to-one observation, and harm reduction interventions regardless of PHQ-9 score. 1
Note: The PHQ-9 includes an item about thoughts of self-harm. While some clinicians omit this item, doing so artificially lowers the score and weakens predictive validity. Endorsement of self-harm thoughts typically occurs alongside multiple other symptoms, not in isolation. 1
Contextual Factors Specific to Relationship Breakup
Research demonstrates that relationship breakup typically causes a temporary increase in depressive symptoms that returns to baseline within 3 months in most individuals. 4 However, certain factors predict more severe or prolonged depression:
Risk factors for worse outcomes:
- Negative subjective appraisal of the breakup 4
- Higher neuroticism 5
- Higher trait rumination 5
- Lower sense of control 4
- Poor cognitive flexibility 5
Trajectory patterns observed: 5
- Resilience (minimal symptoms)
- Fast recovery (symptoms resolve within weeks)
- Slow recovery (gradual improvement over months)
- Chronic distress (persistent symptoms beyond 3 months)
Establishing Formal Diagnosis
A positive PHQ-9 screen alone does not constitute a diagnosis. 6 You must conduct a direct clinical interview to confirm DSM-5 diagnostic criteria for:
- Major Depressive Disorder
- Persistent Depressive Disorder (Dysthymia)
- Other Specified/Unspecified Depressive Disorder
The diagnosis requires 7:
- Five or more symptoms (including depressed mood OR anhedonia as one of the five)
- Present for at least 2 weeks
- Causing clinically significant distress or functional impairment
- Not attributable to substances or medical conditions
- Not better explained by bereavement (though symptoms persisting >2 months, marked functional impairment, worthlessness, suicidal ideation, or psychotic symptoms suggest MDD even in bereavement)
Common Pitfalls to Avoid
Don't dismiss symptoms as "normal sadness" from breakup. While transient sadness is expected, symptoms meeting diagnostic criteria for MDD require treatment regardless of precipitant. 7
Don't delay assessment. The 2-month bereavement exclusion in DSM-5 applies to death of a loved one, not relationship breakup. If criteria are met, diagnose and treat promptly.
Screen for comorbidities. 50-60% of individuals with depression have comorbid anxiety disorders, most commonly generalized anxiety. 1 Consider administering the GAD-7 for anxiety screening.
Assess functional impairment. Ask specifically about work performance, social relationships, self-care, and daily activities. This distinguishes clinical depression from adjustment reactions.
Rule out medical causes. Ensure symptoms aren't due to hypothyroidism, anemia, medication side effects, or substance use before finalizing the diagnosis. 1
Documentation and Follow-Up
Document the PHQ-9 score, specific symptoms endorsed, duration, functional impairment, and risk assessment. Repeat the PHQ-9 every 2 weeks during treatment to objectively monitor progress. 8 If symptoms haven't improved after 8 weeks of appropriate treatment, alter the treatment approach. 1