Signs You Might Be Depressed: What Mental Health Experts Say

Major depressive disorder affects 280 million people globally, yet the World Health Organization reports that fewer than half receive any treatment. One reason: most people cannot distinguish clinical depression from ordinary sadness. The DSM-5 diagnostic criteria require at least 5 of 9 specific symptoms present for 2 or more weeks, with at least one being depressed mood or loss of interest. Knowing exactly what to look for can be life-changing.

The 9 DSM-5 Criteria for Major Depression

Psychiatrists at institutions like Johns Hopkins and Massachusetts General Hospital use these nine criteria as the diagnostic foundation. They are not a checklist for self-diagnosis, but understanding them helps you recognize when a conversation with a professional is warranted.

• Depressed mood most of the day, nearly every day
• Markedly diminished interest or pleasure in almost all activities (anhedonia)
• Significant weight change (more than 5 percent of body weight in one month) or appetite disturbance
• Insomnia or hypersomnia nearly every day
• Psychomotor agitation or slowing observable by others
• Fatigue or loss of energy nearly every day
• Feelings of worthlessness or excessive guilt
• Difficulty concentrating, thinking, or making decisions
• Recurrent thoughts of death or suicidal ideation

How Depression Differs from Sadness

Normal sadness is triggered by a specific event, fades within days to weeks, and does not impair daily functioning across multiple domains. Depression, by contrast, persists for at least 14 consecutive days, is often disproportionate to any triggering event (or has no identifiable trigger at all), and interferes with work, relationships, and self-care. A landmark 2012 study in JAMA Psychiatry found that even grief-related depression lasting more than 2 weeks carried the same functional impairment as non-grief depression, supporting the DSM-5 shift away from the "bereavement exclusion."

One clinically significant marker: anhedonia, the loss of pleasure in activities that previously brought joy. Unlike sadness, anhedonia does not fluctuate with circumstances. A person who is sad can still laugh at a film or enjoy a meal. A person experiencing depression-level anhedonia often cannot, regardless of external conditions.

Physical Symptoms That Are Often Missed

The American Psychological Association notes that 69 percent of people with depression first present to their doctor with a physical complaint, not an emotional one. Common somatic symptoms include unexplained headaches (present in 30 to 40 percent of depressed patients), chronic low back pain, gastrointestinal disturbances, and an exaggerated pain response. A 2021 study in The Lancet found that 47 percent of patients diagnosed with treatment-resistant chronic pain had undiagnosed major depression as the primary driver.

When to Seek Help Immediately

Any thought of suicide or self-harm requires immediate attention, regardless of whether other criteria are met. In the US, the 988 Suicide and Crisis Lifeline is available 24 hours a day by call or text. Globally, the International Association for Suicide Prevention maintains a directory at https://www.iasp.info/resources/Crisis_Centres/. Do not wait for symptoms to worsen.

1. Complete the PHQ-9 self-screener online and print or screenshot your score
2. Book an appointment with a primary care physician or psychiatrist within 7 days
3. If thoughts of self-harm are present, contact a crisis line the same day
4. Bring a trusted person to your first appointment if possible

What Treatment Looks Like

First-line treatment for moderate to severe major depression is a combination of antidepressant medication and psychotherapy, which a 2023 Cochrane review found is 37 percent more effective than either alone. For mild to moderate depression, CBT alone achieves remission in 40 to 60 percent of cases. Treatment typically requires 6 to 12 weeks before full effects are measured. Recovery is common: 80 percent of people with depression improve significantly with proper care, per the National Institute of Mental Health.