This page is for general education and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified professional. If this is an emergency, call 911 or 988.
Persistent depressive disorder (formerly called dysthymia) is a chronic, long-lasting form of depression — low mood that’s present most of the day, more days than not, for two years or more in adults. The symptoms are often milder day to day than a major depressive episode, but because they linger for so long, many people assume it’s simply their personality. It isn’t, and it is treatable.
Key facts
- Persistent depressive disorder lasts two years or more (one year or more in children and teens) (NIMH, MedlinePlus).
- Symptoms are often lower-grade than major depression but long-lasting (NIMH).
- Because it’s chronic, people frequently mistake it for “just how I am.”
- A major episode can develop on top of it — known as double depression.
What it looks like
Alongside a persistent low or “down” mood, people may have:
- Low energy or fatigue
- Poor appetite or overeating
- Sleep problems (too little or too much)
- Low self-esteem
- Trouble concentrating or making decisions
- A sense of hopelessness
These symptoms can feel like a permanent backdrop rather than a sharp change — which is exactly why it’s so often overlooked.
Why it’s easy to miss
Because the low mood has been there for years, people adapt to it and stop noticing it as something separate from themselves. Friends and even doctors may miss it too, since the person keeps functioning. That long, quiet persistence is the signature of this form of depression.
What helps
Persistent depressive disorder responds to the same evidence-based treatments as other depression:
- Therapy, including CBT
- Medication when appropriate
- Often a combination, with consistent, longer-term support given how chronic it is
From our clinical review. The most common thing I hear is, “I’ve always been like this.” That belief is part of the condition. When treatment lifts a low mood someone has carried since their teens, the realization that this wasn’t their personality — it was treatable depression all along — can be genuinely life-changing.
If “always been like this” sounds familiar, it’s worth checking. Explore depression treatment options or take a private, two-minute depression self-check.
Frequently asked questions
What is persistent depressive disorder?
Persistent depressive disorder (formerly called dysthymia) is a chronic form of depression in which low mood lasts most of the day, more days than not, for two years or more in adults. Symptoms are often milder day to day than major depression but are long-lasting.
How is persistent depressive disorder different from major depression?
The main difference is duration and pattern. Major depression comes in episodes lasting at least two weeks, while persistent depressive disorder is chronic, lasting two years or more. Because it's so long-lasting, people often think it's just their personality.
Can persistent depressive disorder be treated?
Yes. It responds to the same evidence-based treatments as other depression — talk therapy such as CBT, medication, or a combination. Because it's chronic, consistent, longer-term care is often especially helpful.
Sources
- Depression — National Institute of Mental Health (NIMH)
- Depression — MedlinePlus, U.S. National Library of Medicine
- Depression — American Psychological Association (APA)
Reviewed against the sources above. This page is educational and is not medical advice.