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Dysthymia: a plain-language definition
Dysthymia, now called persistent depressive disorder, is a depressed mood that lasts most of the day, more days than not, for at least two years. It is less intense than a major episode but wearing because of its duration.
Medically reviewed by Shariq Refai, MD, MBA, FAPA, board certified psychiatrist · Last reviewed June 8, 2026 · Editorial policy
Definition
What dysthymia (persistent depressive disorder) means
Dysthymia, renamed persistent depressive disorder in the DSM-5-TR, is a chronic form of depression. The defining feature is a depressed mood present most of the day, more days than not, for at least two years in adults, along with symptoms like low energy, poor appetite or overeating, sleep changes, low self-esteem, or hopelessness. The intensity can be lower than a major depressive episode, but the duration is what sets it apart.
In practice this is depression that has become part of the background. Many people with persistent depressive disorder have felt this way for so long that they describe it as their normal, or as just being a low-energy or pessimistic person. They may function at work and home while carrying a low-grade weight that rarely lifts. Because it builds slowly and lacks a dramatic onset, it is often underrecognized and undertreated for years.
This matters because the chronic course responds to treatment, and the duration itself causes real harm to relationships, work, and self-image. Antidepressants, particularly SSRIs and SNRIs, are effective, and combining medication with therapy such as CBT tends to work better than either alone for chronic depression. Some people also experience a major depressive episode layered on top, sometimes called double depression, which deserves attention.
A common misconception is that because the symptoms are not severe, they are not worth treating. The long duration is exactly why it merits care; years of low mood take a measurable toll. Another misread is mistaking it for personality. A persistently low, self-critical outlook that lifts with treatment was a condition, not a fixed trait, and recognizing that distinction can change a person's life.
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Frequently asked questions
Good questions, clear answers
Is dysthymia the same as major depression?
Not quite. Dysthymia, or persistent depressive disorder, is usually less intense but lasts at least two years. Major depression is defined by more severe episodes over a shorter minimum period. A person can have both at once.
Is dysthymia just a pessimistic personality?
No. It is a chronic depressive condition that often lifts with treatment. What can look like a fixed gloomy temperament is frequently a treatable disorder.
Can dysthymia be treated?
Yes. Antidepressants such as SSRIs and SNRIs are effective, and combining medication with therapy like CBT often works better than either alone for chronic depression.
Sources
Sources and further reading
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