Depression vs Blues: How to Tell Them Apart and What to Do Next

Depression Is an Illness, Not a Character Flaw

"Pull yourself together," "others have it much worse," "just stop thinking about it" — nearly everyone who has tried to talk about their inner state has heard advice like this. It not only fails to help but actively causes harm: it deepens feelings of guilt, shame, and the sense that something is fundamentally wrong with you.

Depression is an illness — the same as diabetes or hypertension. In depression, the brain's neurotransmitter systems malfunction — primarily the serotonin, dopamine, and norepinephrine pathways. Activity in the prefrontal cortex (responsible for decision-making and emotional regulation) decreases, while the amygdala (the fear and anxiety center) becomes hyperreactive. These are physiological, measurable changes — not "just a bad mood."

According to WHO data, depression is the leading cause of disability worldwide. It affects more than 280 million people. And it responds well to treatment: with properly matched therapy, 60–80% of patients see significant improvement.

DSM-5 Criteria for Depression

The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) defines Major Depressive Disorder as the presence of five or more of the following symptoms over a two-week period, with at least one being depressed mood or loss of interest/pleasure:

• Depressed mood most of the day, nearly every day (emptiness, hopelessness, sadness).
• Markedly diminished interest or pleasure in all or almost all activities (anhedonia).
• Significant weight loss without dieting, or weight gain; or decreased or increased appetite.
• Insomnia or hypersomnia.
• Psychomotor agitation or retardation (observable by others).
• Fatigue or loss of energy nearly every day.
• Feelings of worthlessness or excessive, inappropriate guilt.
• Diminished ability to think, concentrate, or make decisions.
• Recurrent thoughts of death, suicidal ideation (with or without a plan).

The symptoms must cause significant distress or impair social, occupational, or other functioning.

The PHQ-9: A Self-Assessment Tool

The PHQ-9 (Patient Health Questionnaire-9) is a validated screening instrument widely used by doctors and psychologists. It does not replace professional diagnosis but provides a way to gauge symptom severity.

Over the past two weeks, how often have you been bothered by each of the following? Rate: 0 = Not at all, 1 = Several days, 2 = More than half the days, 3 = Nearly every day.

• Little interest or pleasure in doing things.
• Feeling down, depressed, or hopeless.
• Trouble falling or staying asleep, or sleeping too much.
• Feeling tired or having little energy.
• Poor appetite or overeating.
• Feeling bad about yourself — or that you are a failure or have let yourself or your family down.
• Trouble concentrating on things, such as reading or watching television.
• Moving or speaking so slowly that other people could have noticed; or the opposite — being so fidgety or restless you've been moving around more than usual.
• Thoughts that you would be better off dead, or thoughts of hurting yourself.

Scoring: 0–4 = minimal depression; 5–9 = mild; 10–14 = moderate; 15–19 = moderately severe; 20–27 = severe. Any score above 9 warrants consultation with a specialist.

5 Key Differences Between Depression and "Just Sadness"

• Duration. Sadness is a reaction to a specific event that passes within days. Depression lasts two or more weeks, often without a clear trigger.
• Anhedonia. In depression, the ability to enjoy things that once brought pleasure disappears. Favorite food tastes like nothing, hobbies feel meaningless, social contact feels like a burden.
• Impact on functioning. Depression impairs the ability to perform daily tasks: working, cooking, answering messages. Regular sadness does not.
• Somatic symptoms. Physical heaviness, body aches, and slowed movement and speech frequently accompany depression but not ordinary sadness.
• Cognitive distortions. Depression produces stable negative beliefs about oneself ("I am a failure"), the world ("nothing matters"), and the future ("nothing will ever change"). This is not pessimism — it is a symptom of the illness.

Types of Depression

• Major Depressive Disorder (MDD) — the most common form; can be a single episode or recurrent.
• Persistent Depressive Disorder (Dysthymia) — chronic depression with less severe symptoms lasting at least two years. The person is "always a little depressed" — so accustomed to the state that they perceive it as a personality trait.
• Seasonal Affective Disorder (SAD) — depression tied to specific seasons, most often fall and winter. Linked to reduced daylight and lower serotonin production.
• Postpartum Depression — affects 10–15% of women in the first year after childbirth. Not to be confused with the "baby blues," which resolve within 1–2 weeks.
• Bipolar Depression — depressive episodes within bipolar disorder alternate with manic or hypomanic episodes. Requires a specialized treatment approach.

Modern Treatment Approaches

• Psychotherapy. Cognitive-behavioral therapy (CBT) is the gold standard with a strong evidence base for mild to moderate depression. Also effective: interpersonal therapy, behavioral activation, Acceptance and Commitment Therapy (ACT).
• Medication. Antidepressants (SSRIs, SNRIs) are effective for moderate to severe depression. Prescribed by a psychiatrist; effects develop over 2–4 weeks. Important: never discontinue antidepressants without medical guidance.
• Lifestyle changes. Physical exercise is the only non-pharmacological method with proven effects comparable to antidepressants for mild depression. Also: sleep normalization, social connection, reducing alcohol consumption.
• Transcranial Magnetic Stimulation (TMS) — a non-invasive method of stimulating brain regions involved in depression. Used for treatment-resistant forms.

How to Support a Loved One with Depression

• Listen without giving advice or making judgments. "You should..." or "why don't you..." doesn't work. Simply be present and listen.
• Don't minimize their experience. "You have everything you could want" is not support.
• Offer specific help. Not "call me if you need anything," but "I'll stop by tomorrow — want me to bring food?"
• Help them find a specialist. Part of the depressive state is the feeling that nothing will help and there's no point in trying. The person may find it genuinely difficult to make a call and schedule an appointment.
• Watch for signs of suicidal risk. Direct statements about wanting to die, giving away possessions, saying goodbye — these warrant immediate professional intervention.

Medical disclaimer: this article is for informational purposes only and does not constitute medical advice. Diagnosis and treatment are the exclusive domain of a licensed physician. If you suspect depression in yourself or someone close to you, please seek professional help.