How long must dysthymia last for diagnosis?

DSM-5 requires at least two years in adults (one year in children/adolescents) of depressed mood more days than not.

Is dysthymia less serious than major depression?

No. While symptoms are milder, the chronic nature of dysthymia causes significant functional and relational impairment over years.

Yes. This is called "double depression"—major depressive episodes superimposed on chronic dysthymia. It requires careful treatment planning.

Peter Kolomiets

|March 18, 2026|Updated Apr 13, 2026|6 min

Ready to discover your Depression Screener?

American Psychiatric Association (2013). Diagnostic and Statistical Manual of Mental Disorders (DSM-5)
Cuijpers P, Smit F (2004). Persistence and Change in Depressive Symptoms Over Time

Put what you've learned into practice with these free assessments:

High-functioning depression means meeting responsibilities while struggling internally. Learn why this "smiling depression" is especially dangerous.

Determine when depression requires professional intervention. Learn warning signs prompting immediate medical attention versus supportive care.