Mood and interest
Persistent sadness, emptiness, irritability or reduced interest and pleasure can be central features.
Depression
Depression symptoms, screening and when to seek professional support
Depression can affect mood, interest, energy, sleep, concentration, appetite and daily functioning. This hub explains the pattern and the limits of online screening.
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Important use limits
This hub is educational and the connected screener is not a diagnosis. Persistent, severe, worsening or safety-related concerns should be discussed with a qualified professional.
Overview
Depression can affect more than mood
Depression may involve persistent low mood or loss of interest together with changes in energy, sleep, concentration, appetite, movement, self-evaluation and thoughts about death or suicide.
Energy and thinking
Fatigue, slowed thinking, poor concentration and difficulty making decisions can occur.
Sleep and appetite
Some people sleep or eat more, while others sleep or eat less.
Function and safety
Withdrawal, difficulty meeting responsibilities and thoughts of death or suicide can signal a need for prompt support.
Connected screening route
Depression Screening (PHQ-9)
The PHQ-9 summarizes nine common depression symptoms over the previous two weeks. It can support screening and follow-up, but a score alone cannot establish a diagnosis or rule out other medical or mental-health causes.
9 itemsPrevious 2 weeksFree basic resultSafety guidance remains free
Evaluation
Diagnosis considers symptoms, duration, impairment and other causes
A clinician may review symptom duration, medical conditions, medications, substance use, bipolar-spectrum symptoms, grief, trauma, sleep and other factors that can resemble or complicate depression.
Duration
More than a bad day
Clinical evaluation looks at persistence across days and weeks, not a single low mood state.
Explore →FunctionDaily impact matters
Difficulty working, studying, caring for yourself or maintaining relationships is important context.
Explore →DifferentialOther causes need consideration
Medical conditions, medications, bipolar disorder, substance effects and other mental-health conditions can change the interpretation.
Explore →!
Thoughts of suicide or immediate danger need urgent support
In the United States, call or text 988 for the Suicide & Crisis Lifeline. If there is immediate danger or a medical emergency, call 911 or go to the nearest emergency department.
Use this hub well
Treat the result as screening information, not a verdict
A PHQ-9 result is one piece of information. It does not explain why symptoms are present and should not be used to make medication or treatment decisions on your own.
- Read the symptom pattern alongside the total score.
- Take any self-harm response seriously even if the total score is otherwise low.
- Seek professional assessment when symptoms persist, worsen or interfere with daily functioning.
Depression in context
Depression is assessed through a pattern of symptoms and impairment
Sadness is one possible part of depression, but depression can also involve loss of interest, low energy, sleep or appetite changes, slowed or agitated movement, concentration problems, guilt, hopelessness and thoughts about death. What matters clinically is the pattern, persistence, severity and effect on functioning.
| Question | Why it matters |
|---|---|
| Has pleasure or interest dropped? | Loss of interest can be as important as low mood in a depressive picture. |
| Are sleep, appetite, energy or concentration changing? | These symptoms add information about severity but can also have other medical or psychological causes. |
| Is functioning affected? | Difficulty working, studying, caring for yourself or staying connected can increase the need for assessment. |
| Have there been periods of unusually elevated mood or reduced need for sleep? | A clinician may ask about bipolar-spectrum symptoms before deciding on a treatment plan. |
| Are there thoughts of death, self-harm or suicide? | These need direct safety assessment; immediate danger requires urgent help. |
A screening score is a starting point, not a treatment plan
The PHQ-9 can help summarize current depressive symptoms and track change, but the same score can occur for different reasons. Professional evaluation can consider grief, trauma, bipolar symptoms, substance use, sleep disorders, medications and medical conditions alongside depression.
For the everyday distinction many people search for, see depression vs sadness. If you are deciding where to start with care, do I need therapy? explains common routes.
Preparing for care
Track the course of symptoms and what has changed in daily life
Before a professional visit, note when symptoms began, whether they are continuous or episodic, and how sleep, appetite, concentration, work or study, relationships and self-care have changed. Include recent losses or stressors, medical conditions, medications and substance use.
It is also important to mention any periods of unusually high energy, reduced need for sleep, marked impulsivity or elevated mood, because treatment planning may differ when bipolar-spectrum symptoms are present. If suicidal thoughts are present, say so directly rather than relying on the total PHQ-9 score to communicate risk.
Treatment can involve psychotherapy, medication, lifestyle support, treatment of contributing medical conditions or a combination. The right approach depends on severity, history, preferences, access and safety rather than a single online score.
Evidence and source notes
Authoritative sources behind this page
These sources support the general educational framing on this hub. They do not substitute for individual medical advice or final independent clinical review of DesperateMinds content.
NIMH: Depression
NIMH describes common depression symptoms, diagnostic evaluation, treatment and urgent safety guidance.
Read the source →Next step
Depression symptoms that persist deserve professional support
Use Find Help to understand therapy, primary care, psychiatry and urgent support options. A clinician can help evaluate causes and discuss treatment choices.