The PHQ-9 is one of the most common questionnaires used to screen for depression and track depressive symptoms over time. It is brief, practical, and widely used in primary care, therapy, psychiatry, school health, and research settings. A score can help show whether symptoms are minimal, mild, moderate, moderately severe, or severe, but it does not diagnose depression by itself.
A PHQ-9 result is most useful when it is interpreted alongside the full picture: how long symptoms have been present, how much they affect daily life, whether there are thoughts of self-harm, and whether other medical, sleep, substance-related, medication-related, or mental health factors could be contributing.
Table of Contents
- How the PHQ-9 Works
- PHQ-9 Score Ranges
- What a PHQ-9 Result Can and Cannot Show
- When Your Score Needs Follow-Up
- Item 9 and Suicide Risk
- How Clinicians Use PHQ-9 Results
- Special Situations and Common Limitations
- How to Use Your Score Practically
How the PHQ-9 Works
The PHQ-9 asks how often nine depression-related symptoms have bothered you during the past two weeks. Each item is scored from 0 to 3, and the total score ranges from 0 to 27.
The response choices are:
- 0: Not at all
- 1: Several days
- 2: More than half the days
- 3: Nearly every day
The nine questions cover symptoms such as low mood, loss of interest or pleasure, sleep changes, fatigue, appetite changes, feelings of guilt or worthlessness, trouble concentrating, slowed or restless movement, and thoughts of death or self-harm. These symptoms closely match the symptom areas clinicians ask about when evaluating depression, but the questionnaire is still only one part of an assessment.
The PHQ-9 also includes a separate difficulty question asking how much the symptoms have interfered with work, home responsibilities, or relationships. That item is not usually counted in the 0–27 score, but it matters clinically. A person with a score of 10 who is barely functioning at work may need a different level of support than someone with the same score whose symptoms are distressing but not strongly impairing daily life.
The PHQ-9 is sometimes used after a shorter two-question screen, such as the PHQ-2. The shorter version asks about low mood and loss of interest, then a longer questionnaire may be used if those answers suggest possible depression. For a closer comparison, see how the PHQ-2 and PHQ-9 differ.
The score is easiest to interpret when the answers reflect the past two weeks accurately. That can be hard when symptoms fluctuate, when someone has trouble remembering the last 14 days, or when shame, fear, or habit leads them to minimize how bad things have been. It can also be hard in the other direction: a very difficult day can make the entire two-week period feel worse than it was. For that reason, clinicians often ask follow-up questions rather than treating the number as the whole story.
PHQ-9 Score Ranges
PHQ-9 scores are commonly grouped into five severity ranges. The ranges help describe symptom burden, but they should not be treated as automatic diagnoses or rigid treatment instructions.
| Total PHQ-9 score | Common severity label | What it often suggests |
|---|---|---|
| 0–4 | None or minimal symptoms | Few depressive symptoms reported during the past two weeks. |
| 5–9 | Mild symptoms | Some depressive symptoms are present, but they may or may not meet criteria for a depressive disorder. |
| 10–14 | Moderate symptoms | Symptoms are more clinically significant and usually deserve follow-up assessment. |
| 15–19 | Moderately severe symptoms | Depression is more likely to be affecting daily functioning, and active treatment planning is often appropriate. |
| 20–27 | Severe symptoms | Symptoms are high and should be evaluated promptly, especially if functioning is impaired or self-harm thoughts are present. |
A score of 0–4 usually means the person is reporting little depression symptom burden at that moment. It does not prove that everything is fine. Someone may still have anxiety, grief, trauma symptoms, substance use concerns, burnout, sleep deprivation, or another issue not fully captured by the PHQ-9.
A score of 5–9 often reflects mild symptoms. This range can occur during a stressful life event, early depression, partial recovery, chronic low mood, sleep disruption, or physical illness. Mild does not mean “not real.” It means the total symptom score is lower than the ranges typically associated with more impairing depression.
A score of 10–14 is often used as an important threshold because it suggests moderate symptoms and a higher chance of clinically significant depression. A score around 10 is not a final diagnosis, but it is a strong reason to ask more questions about duration, impairment, safety, medical causes, and whether treatment or closer monitoring is needed.
A score of 15–19 suggests moderately severe symptoms. At this level, people often report meaningful problems with energy, concentration, sleep, self-worth, motivation, or daily responsibilities. Professional evaluation is especially important if symptoms have lasted more than two weeks, are worsening, or are affecting work, school, caregiving, relationships, or basic self-care.
A score of 20–27 suggests severe symptom burden. This range deserves timely clinical attention, not because the number alone defines a crisis, but because high scores are more likely to reflect broad, persistent, and impairing symptoms. A high result is especially concerning when it includes thoughts of self-harm, inability to function, psychotic symptoms, substance misuse, or possible bipolar disorder.
For more detail on interpreting higher scores, see what a high PHQ-9 score may mean.
What a PHQ-9 Result Can and Cannot Show
A PHQ-9 result can show the level of depressive symptoms you reported over the past two weeks. It cannot, by itself, prove the cause of those symptoms or replace a diagnostic interview.
This distinction matters because depression symptoms overlap with many other problems. Fatigue, poor concentration, sleep changes, appetite changes, and low motivation can occur with major depressive disorder, but they can also occur with anxiety disorders, bipolar depression, grief, post-traumatic stress, substance use, chronic pain, thyroid disease, anemia, vitamin deficiencies, sleep apnea, medication side effects, and major life stress.
A PHQ-9 score is strongest as a screening and monitoring tool. It can help answer questions such as:
- Are depressive symptoms present?
- Are symptoms mild, moderate, or severe by questionnaire score?
- Are symptoms improving, worsening, or staying the same over time?
- Is there a self-harm response that requires more direct safety assessment?
- Does the person need a fuller mental health evaluation?
It is weaker at answering questions such as:
- “Do I definitely have major depressive disorder?”
- “Is this caused by trauma, hormones, ADHD, grief, burnout, or a medical condition?”
- “Which treatment will work best for me?”
- “Am I safe?”
- “Do I need medication?”
Those questions require clinical judgment. A professional evaluation may include a conversation about symptom duration, past episodes, family history, medical history, current medications, sleep, substance use, functioning, trauma exposure, and whether there have ever been episodes of unusually elevated mood, decreased need for sleep, impulsivity, or risky behavior. That last point matters because bipolar disorder can include depressive episodes, and treating bipolar depression as unipolar depression can lead to poor outcomes.
A positive screen is also not the same as a diagnosis. Screening tools are designed to flag people who may need a closer look. Diagnosis depends on whether symptoms meet clinical criteria, cause distress or impairment, and are not better explained by another condition. For a broader explanation, see the difference between screening and diagnosis.
When Your Score Needs Follow-Up
A PHQ-9 score needs follow-up when symptoms are moderate or higher, when daily life is affected, when symptoms are worsening, or when any answer suggests self-harm thoughts. Even a lower score can deserve attention if it does not fit how you are actually functioning.
A practical way to think about follow-up is to look at both the number and the situation around it. A score of 6 during a stressful week may call for monitoring, sleep support, and a check-in. A score of 6 that has persisted for months with withdrawal, low motivation, and loss of pleasure may need a fuller evaluation. A score of 13 with major work impairment deserves more attention than the same score with mild, improving symptoms and strong support.
Professional follow-up is especially important when:
- symptoms have lasted most days for two weeks or longer
- symptoms interfere with work, school, caregiving, hygiene, meals, sleep, or relationships
- there is loss of interest or pleasure in nearly everything
- there are thoughts of death, self-harm, or feeling like others would be better off without you
- there is heavy alcohol use, drug use, or misuse of sedatives or stimulants
- there are hallucinations, paranoia, extreme agitation, or confusion
- there are past manic or hypomanic episodes
- depression occurs during pregnancy, after childbirth, or during major hormonal transitions
- symptoms appear after a medication change or medical illness
- the score is rising over repeated PHQ-9 checks
A clinician may repeat the PHQ-9, ask additional questions, use other screening tools, or recommend lab testing when symptoms could be partly medical. For example, thyroid disease, anemia, vitamin B12 deficiency, sleep disorders, inflammatory illness, and medication effects may contribute to fatigue, low mood, and poor concentration. A related workup is discussed in blood tests used to rule out medical causes of depression and anxiety.
Follow-up does not always mean medication. Depending on the severity and context, next steps may include watchful waiting with a planned check-in, psychotherapy, behavioral activation, sleep treatment, addressing substance use, social support, exercise planning, medication, crisis care, or referral to a mental health specialist. What matters is that the score leads to a thoughtful assessment, not a one-size-fits-all response.
Item 9 and Suicide Risk
Item 9 asks about thoughts that you would be better off dead or of hurting yourself. Any score above 0 on this item should be taken seriously and followed by a direct safety assessment.
This item is not a complete suicide risk assessment. Some people endorse it because they have passive thoughts such as “I wish I would not wake up,” while others may be thinking about self-harm, planning suicide, or feeling unable to stay safe. The PHQ-9 cannot reliably tell the difference without follow-up questions.
A clinician may ask whether the thoughts are passive or active, whether there is a plan, whether there is access to lethal means, whether the person has attempted suicide before, whether substance use is increasing risk, and whether there are protective factors such as supportive people, responsibilities, beliefs, future plans, or willingness to accept help.
Urgent help is needed if there is any immediate risk. That includes having a plan to harm yourself, feeling unable to stay safe, preparing to act, recently attempting self-harm, hearing voices telling you to hurt yourself, being severely intoxicated, or being alone with access to a lethal method. In those situations, call emergency services, go to the nearest emergency department, or contact a crisis line right away. In the United States and Canada, call or text 988 for immediate suicide and crisis support.
It can be difficult to answer item 9 honestly because people may fear hospitalization, judgment, or burdening others. But disclosure helps clinicians match the response to the actual level of risk. Many people who report suicidal thoughts do not need hospitalization, but they do need a more complete conversation and a safety plan. That plan may include reducing access to lethal means, identifying warning signs, naming support people, arranging urgent follow-up, and deciding what to do if the thoughts intensify.
For more context, see how suicide risk screening is used and when emergency care is needed for mental health symptoms.
How Clinicians Use PHQ-9 Results
Clinicians use the PHQ-9 to guide conversation, estimate symptom severity, track change over time, and decide whether additional evaluation or treatment is needed. The number is useful, but the pattern of answers often matters just as much.
For example, two people can both score 12. One may score mainly on sleep, fatigue, and appetite after a medical illness. Another may score high on loss of pleasure, worthlessness, concentration problems, and self-harm thoughts. The same total score can point to different clinical conversations.
In an initial visit, a clinician may use the PHQ-9 to decide whether to ask more detailed questions about major depressive disorder, persistent depressive disorder, bipolar disorder, anxiety, trauma, substance use, grief, or medical contributors. If the score is positive, next steps usually include confirming symptoms in the person’s own words rather than relying only on the questionnaire.
During treatment, the PHQ-9 can be repeated to see whether symptoms are changing. A falling score may suggest improvement, while a flat or rising score may suggest the need to adjust the plan. Still, change should be interpreted with context. A score might improve because sleep improves, because therapy is helping, because a stressful situation has resolved, or because the person is underreporting symptoms. A score might worsen because of a relapse, medication side effects, insomnia, substance use, grief, or a new medical problem.
The PHQ-9 is often used alongside other tools. Anxiety symptoms may be screened with the GAD-7, postpartum symptoms with the EPDS, alcohol use with the AUDIT-C or AUDIT, and suicide risk with a dedicated suicide assessment tool. If results from different tools seem mixed, the clinical interview helps sort out what is most important.
A positive screen can feel alarming, but it is meant to open the door to help. For a broader view of next steps after mental health screening, see what happens after a positive mental health screen.
Special Situations and Common Limitations
The PHQ-9 is widely used, but it does not fit every situation perfectly. Age, culture, language, medical conditions, pregnancy, cognitive changes, and symptom overlap can all affect how results should be read.
In teens, depression may show up as irritability, school decline, withdrawal, sleep changes, self-criticism, or unexplained physical complaints. The PHQ-9 or adolescent versions may be used, but parents, caregivers, and clinicians should not rely only on a questionnaire. Safety, bullying, trauma, substance use, eating concerns, family stress, and neurodevelopmental conditions may all be relevant.
In older adults, symptoms such as poor sleep, low energy, appetite change, and slowed movement may overlap with chronic illness, pain, medication effects, grief, cognitive impairment, or reduced mobility. Depression can also resemble cognitive decline in some people, especially when concentration and memory are affected. In those cases, a clinician may evaluate both mood and cognition.
In pregnancy and the postpartum period, depression symptoms require careful attention because they can affect the parent, infant, bonding, sleep, feeding, safety, and family functioning. Some clinicians use the PHQ-9, while others use perinatal-specific tools such as the EPDS. Any thoughts of self-harm or harming the baby require prompt professional attention.
In bipolar disorder, the PHQ-9 can detect depressive symptoms but does not detect past mania or hypomania. A person with bipolar depression may score high on the PHQ-9, but the treatment approach can differ from unipolar depression. A history of periods with unusually high energy, decreased need for sleep, impulsive behavior, racing thoughts, or risky decisions should be discussed before starting treatment.
In medical or medication-related symptoms, the PHQ-9 may capture the symptom burden but not the cause. Some blood pressure medicines, corticosteroids, hormonal treatments, sedatives, alcohol, cannabis, stimulants, and withdrawal from certain medications can affect mood, sleep, energy, or concentration. Medical conditions such as thyroid disease, anemia, vitamin deficiencies, sleep apnea, chronic infection, autoimmune disease, and neurological disorders can also contribute.
Cultural and language factors matter too. Some people describe depression mainly through physical symptoms. Others may avoid words such as “depressed” but recognize exhaustion, numbness, irritability, heaviness, or loss of interest. A translated PHQ-9 can help, but a culturally sensitive clinical conversation remains important.
How to Use Your Score Practically
The most useful response to a PHQ-9 score is to treat it as information, not a verdict. Write down the score, notice which items were highest, and use the result to decide what kind of follow-up makes sense.
If the score is low but you still feel unlike yourself, do not ignore that mismatch. The PHQ-9 focuses on depression symptoms, not every mental health or brain-related concern. Anxiety, trauma, ADHD, burnout, grief, sleep disorders, substance use, and medical problems can all cause distress even when the depression score is low.
If the score is mild, consider whether symptoms are new, improving, situational, or persistent. Mild symptoms may improve with sleep regularity, social connection, structured activity, reduced alcohol use, physical activity, problem-solving, therapy, or addressing a specific stressor. If mild symptoms continue, worsen, or impair your life, professional support is still appropriate.
If the score is moderate or higher, it is reasonable to schedule a conversation with a primary care clinician, therapist, psychiatrist, or other qualified mental health professional. Bring the score, the date you took it, and a few notes about what has changed in your life. It can help to write down sleep patterns, appetite changes, concentration problems, substance use, medications, recent losses, physical symptoms, and any past depression or bipolar symptoms.
If you are already in treatment, repeated scores can help show whether the plan is working. Try to take the PHQ-9 at similar intervals and under similar conditions, such as before appointments or every few weeks, rather than several times a day. Too-frequent checking can make some people more anxious and can magnify normal day-to-day mood changes.
A useful follow-up note might include:
- Your total PHQ-9 score and the date.
- Your highest-scoring items.
- Whether item 9 was above 0.
- How much symptoms affect work, school, home, or relationships.
- What has changed recently: sleep, stress, illness, medications, alcohol or drug use, grief, or major life events.
- What kind of help you are open to: therapy, medical evaluation, medication discussion, crisis support, lifestyle changes, or a combination.
Mental health test results can be confusing when several tools are used together. For a broader framework, see how common mental health test scores are interpreted.
A PHQ-9 score can be a useful starting point for care, especially when it helps someone describe symptoms they have been carrying quietly. The next step is not to label yourself by the number. The next step is to use the number to get clearer, safer, and more specific support.
References
- PATIENT HEALTH QUESTIONNAIRE (PHQ-9) 2005 (Validated Instrument)
- The PHQ-9: Validity of a Brief Depression Severity Measure 2001 (Validation Study)
- Accuracy of the Patient Health Questionnaire-9 for screening to detect major depression: updated systematic review and individual participant data meta-analysis 2021 (Systematic Review and Meta-Analysis)
- Depression and Suicide Risk in Adults: Screening 2023 (Guideline)
- Depression and Suicide Risk in Children and Adolescents: Screening 2022 (Guideline)
- Depression in adults: treatment and management 2022 (Guideline)
Disclaimer
This content is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. A PHQ-9 score should be interpreted with a qualified clinician, especially if symptoms are moderate or severe, worsening, affecting daily life, or include thoughts of self-harm.
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