PHQ-9 vs GAD-7: Which Mental Health Screening Should You Use?
When you decide to measure your mental health, the first question is often practical: which questionnaire? The two most common short screeners are the PHQ-9 (depression) and the GAD-7 (anxiety). Both take minutes, use similar 0–3 response scales, and are validated in primary care. They are not competitors—they answer different questions. This guide helps you pick a starting point and know when to use both.
What each tool is designed to detect
PHQ-9 focuses on depressive symptoms over the last two weeks: low mood, loss of interest, sleep and appetite changes, fatigue, guilt, concentration problems, psychomotor changes, and thoughts of self-harm. Total scores run 0–27. See the full guide: PHQ-9 depression screening.
GAD-7 focuses on generalized anxiety: feeling on edge, uncontrollable worry, trouble relaxing, restlessness, irritability, and fear that something awful might happen. Total scores run 0–21. Details: GAD-7 anxiety screening.
Quick decision guide
| If this sounds most like you… | Start with |
|---|---|
| Empty, sad, no motivation, lost interest | PHQ-9 |
| Constant worry, tension, “what if” loops | GAD-7 |
| Both have been present for two+ weeks | Both (same day is fine) |
| Main problem is sleep | ISI plus mood/anxiety screeners |
| Main problem is work or relationships slipping | WSAS plus PHQ-9 and/or GAD-7 |
Why many people need both
Depression and anxiety are highly comorbid. Worry can drain energy and mimic depression; low mood can fuel catastrophic thinking. Clinicians often administer both at intake because treating only the dominant symptom can miss the driver of disability.
On digital platforms, completing both establishes a baseline for trend tracking. You might discover anxiety scores fall while depression scores lag—a clue that treatment should target rumination and avoidance, not only sleep. Read depression awareness and understanding anxiety for how each condition feels day to day.
Score thresholds at a glance
PHQ-9: 0–4 minimal, 5–9 mild, 10–14 moderate, 15–19 moderately severe, 20–27 severe. Many clinicians act on 10+ when symptoms persist.
GAD-7: 0–4 minimal, 5–9 mild, 10–14 moderate, 15–21 severe. 10+ commonly triggers follow-up.
These are screening bands, not diagnoses. Context—grief, medical illness, substance use, trauma—always matters.
Coping while you wait for follow-up
Screening is a starting point, not a treatment plan. If scores are mild to moderate, evidence-based self-management can help while you schedule care:
- Sleep routine — Consistent wake time; screen sleep distress with ISI if nights are central.
- Movement and nutrition — Regular walks and balanced meals support both mood and worry regulation.
- Grounding and mindfulness — See mindfulness techniques for paced breathing and present-moment skills.
- Social connection — Isolation worsens both PHQ-9 and GAD-7 patterns; self-care practices include boundary-setting and support-seeking.
If workplace burnout or relationship burnout is the main stressor, address the environment—not only symptoms.
What these tools do not cover
Neither PHQ-9 nor GAD-7 specifically screens for PTSD, OCD, panic disorder, bipolar disorder, ADHD, or psychosis. Mention those symptoms directly to a clinician. For functional impact, add WSAS. For insomnia distress, add ISI. ADHD and mental health is relevant when attention and executive function dominate.
When to seek help urgently
Seek immediate help for self-harm thoughts, plans, or intent—regardless of PHQ-9 total score. The PHQ-9 self-harm item alone warrants emergency or crisis-line contact when endorsed above zero.
Also seek prompt care for severe scores (PHQ-9 20+, GAD-7 15+), psychosis, inability to care for yourself, or rapid worsening after a life event. Use One Mental Hub to track scores and share trends with professionals; see early mental health screening for why measuring before crisis matters.
How to build a screening routine
- Choose PHQ-9, GAD-7, or both based on the table above.
- Repeat monthly during stressful periods or weekly if a clinician asks.
- Note life events beside each score (job loss, conflict, illness).
- Share trends on One Mental Hub with a professional when ready.
- Seek urgent help for self-harm thoughts regardless of scores.
Case sketches: which door fits?
After job loss — Sleep and appetite change, tearfulness, lost interest: start PHQ-9; add GAD-7 if “what if I never work again” loops dominate; add WSAS if you stop applying or socializing.
Before public speaking season — Restlessness and dread Sundays: start GAD-7; add PHQ-9 if mood crashes after events; social anxiety coping strategies if fear is situational.
New parent — Fragmented sleep: start ISI; add PHQ-9 for mood and GAD-7 for catastrophic worry about the baby’s health.
Sharing results with professionals
Export or show trend lines from One Mental Hub at intake. Highlight life events beside spikes so clinicians do not over-attribute scores to biology alone.
Re-screening after treatment starts
If you begin therapy or medication, repeat both screeners at week 4 and week 8. Asymmetric improvement (GAD-7 down, PHQ-9 flat) guides which diagnosis needs more focus in session—a practical reason clinicians love paired data.
The takeaway
There is no wrong door if you are honest about symptoms. If mood dominates, start with PHQ-9. If worry dominates, start with GAD-7. If life feels heavy on every front, do both and add WSAS. Screening is the first sentence of a longer conversation—not the last word.