Free PHQ-9 Depression Screener
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The Five PHQ-9 Severity Levels
Standard cutoffs from Kroenke, Spitzer & Williams (2001).
What the PHQ-9 Measures
The Science Behind the PHQ-9
The PHQ-9 was developed by Drs. Kurt Kroenke, Robert Spitzer, and Janet Williams in the late 1990s and validated in a landmark 2001 study published in the Journal of General Internal Medicine. It was designed as a brief, self-administered tool that primary care physicians could use to screen for depression — and that patients could complete in a waiting room in under three minutes.
Each of the nine items maps directly to one of the nine DSM diagnostic criteria for major depressive disorder: depressed mood, loss of interest, sleep disturbance, fatigue, appetite change, feelings of worthlessness, concentration difficulty, psychomotor changes, and thoughts of death or self-harm. By design, a clinician scanning a completed PHQ-9 can see at a glance which DSM symptoms are present.
Validation studies have consistently shown strong psychometric properties — sensitivity around 88% and specificity around 88% for major depression at the standard cutoff of 10. The scale has been translated into more than 80 languages and tested across diverse populations — primary care, obstetric, oncology, adolescent, and geriatric — with comparable results.
Importantly, the PHQ-9 was released into the public domain by Pfizer, the original sponsor, with no licensing fees. That decision is why the screener is now used in tens of thousands of clinics worldwide — and why a tool like this one can offer it free.
How Depression Shows Up Day to Day
Depression is often described as feeling sad, but for many people the dominant experience is closer to numbness, exhaustion, or a slow narrowing of life. Sadness comes and goes. Depression tends to stay, and it changes how the body and mind operate.
Common day-to-day signs:
- Loss of interest in things you used to enjoy. Hobbies, food, music, social plans — they don't generate the response they used to. This is anhedonia, and it's one of the most reliable signs.
- Physical heaviness and fatigue. Sleep doesn't restore. Tasks that should take 15 minutes take an hour. Many people describe their limbs as "filled with sand."
- Cognitive slowing. Difficulty concentrating, holding a thought, finishing a sentence in a meeting. Memory feels patchy. Decisions — even small ones — feel impossible.
- A harsh inner voice. A loop of "I'm a burden," "Nothing I do matters," "I'm broken" — beliefs that feel like facts in the moment.
- Changes in appetite or sleep. Either too much or too little, in a direction that's new for you and lasts more than a couple of weeks.
Depression can be subtle. Many people who screen positive don't think of themselves as "depressed" — they think they're lazy, weak, or simply having a long bad stretch. The PHQ-9 was designed precisely to catch these cases.
What Causes Depression
Modern research treats depression as the product of multiple interacting factors — biological, psychological, and social — rather than a single cause. The older "chemical imbalance" framing has been largely retired by the research community in favor of this more accurate, layered model.
The three layers:
- Biological. Heritability estimates for major depression sit around 30–40%. Genes influence stress reactivity, neurotransmitter regulation, and circadian rhythm. Inflammation, hormonal shifts (postpartum, thyroid), and chronic illness can also raise risk.
- Psychological. Cognitive patterns — particularly rumination and harsh self-evaluation — predict depression onset. Childhood adversity (the ACE studies) is one of the strongest known risk factors. So is recent loss: a relationship, a job, a sense of identity.
- Social. Loneliness, financial strain, discrimination, and chronic stress at work all elevate risk. Depression rates are not evenly distributed — they track the social conditions people live within.
This model has practical implications. Because depression is multi-factorial, treatments that target only one layer (e.g., medication alone) help fewer people than combined approaches. It also means depression is not a personal failure: the conditions that produce it are largely outside any individual's control.
Depression vs. Burnout vs. Grief
The PHQ-9 can score high in conditions that aren't clinical depression. Three of the most common look-alikes are burnout, grief, and adjustment to a major life change. They overlap with depression in real ways but differ in important ones.
- Burnout is tied to a specific demand — typically work — and tends to lift when that demand is reduced or removed. Depression doesn't lift the same way; it follows you on vacation.
- Grief is loss-specific and tends to come in waves around reminders of the loss. Self-worth usually remains intact in grief, whereas depression often involves global self-criticism ("I am bad," not "I miss them").
- Adjustment reactions follow identifiable stressors (a move, divorce, job loss) and tend to resolve as the person stabilizes in the new situation — usually within months.
These distinctions matter for treatment. A high PHQ-9 driven by burnout responds to workload change. A high score from grief responds to grief-specific support. A high score from depression typically responds best to therapy, medication, or both. A clinician's job is to figure out which mix is in play — which is why the PHQ-9 is a screener, not a diagnosis.
What Treatments Actually Work
Depression is one of the most studied conditions in mental health, and several treatments have strong evidence behind them. The good news: most people who start treatment improve. The harder news: finding the right combination often takes some iteration.
Evidence-based first-line options:
- Cognitive Behavioral Therapy (CBT). The most rigorously studied talk therapy for depression. CBT teaches people to identify the cognitive patterns (rumination, hopeless thoughts) and behaviors (withdrawal, inactivity) that maintain depression — and to change them. Effects are comparable to medication for many people.
- Interpersonal Therapy (IPT) and Behavioral Activation. Both have evidence on par with CBT. IPT focuses on relationships and role transitions; behavioral activation focuses on re-engaging with valued activities even before motivation returns.
- SSRIs and SNRIs. First-line antidepressants for moderate-to-severe depression. They typically take 4–6 weeks to show full effect. Roughly half of people respond to the first medication tried; many of the rest respond to a second.
- Exercise. A 2013 Cochrane review (Cooney et al.) found exercise produces a moderate antidepressant effect, comparable in magnitude to psychotherapy in mild-to-moderate cases. Not a substitute for treatment in severe depression, but a strong adjunct.
- Combined treatment. For moderate-to-severe depression, therapy plus medication outperforms either alone in head-to-head trials.
For depression that doesn't respond to several adequate trials (treatment-resistant depression), newer options include TMS (transcranial magnetic stimulation) and ketamine-derived treatments, both with growing evidence in specialty settings.
When to Seek Help — and When It's a Crisis
A PHQ-9 score is a snapshot, not a verdict. But two patterns warrant prompt action:
- Score of 10 or higher. The standard threshold for "clinically significant" depression. At this level, a conversation with a primary care doctor or mental health professional is strongly recommended. Don't wait for symptoms to "pass on their own" — at moderate severity, they usually don't.
- Any positive answer on Item 9. Item 9 asks about thoughts of being better off dead or hurting yourself. Even rare thoughts deserve a conversation with a professional. Frequent thoughts ("more than half the days" or "nearly every day") are urgent.
If you are in crisis right now:
- 📞 Call or text 988 — US Suicide & Crisis Lifeline (24/7, free, confidential)
- 💬 Text HOME to 741741 — Crisis Text Line
- 🌐 findahelpline.com — International helplines by country
- 🚑 Call 911 or go to the nearest ER if you are in immediate danger of harming yourself
The PHQ-9 is a screening tool, not a diagnostic instrument. A high score is a signal to seek a professional evaluation — not a label for who you are.
Frequently Asked Questions
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