Persistent depressive disorder
Persistent depressive disorder (PDD) is a chronic (ongoing) type of depression in which a person's moods are regularly low.
Persistent depressive disorder used to be called dysthymia.
PDD; Chronic depression; Depression - chronic; Dysthymia
The exact cause of PDD is unknown. It can run in families. PDD occurs more often in women.
Most people with PDD will also have an episode of major depression at some point in their lives.
Older people with PDD may have difficulty caring for themselves, struggle with isolation, or have medical illnesses.
The main symptom of PDD is a low, dark, or sad mood on most days for at least 2 years. In children and teens, the mood can be irritable instead of depressed and lasts for at least 1 year.
In addition, two or more of the following symptoms are present almost all of the time:
People with PDD will often take a negative or discouraging view of themselves, their future, other people, and life events. Problems often seem hard to solve.
Exams and Tests
Your health care provider will take a history of your mood and other mental health symptoms. The provider may also check your blood and urine to rule out medical causes of depression.
There are a number of things you can try to improve PDD:
Medicines are often effective for PDD, though they sometimes do not work as well as they do for major depression and may take longer to work.
Do not stop taking your medicine on your own, even if you feel better or have side effects. Always call your provider first.
When it's time to stop your medicine, your provider will instruct you on how to slowly reduce the dose instead of stopping suddenly.
People with PDD may also be helped by some type of talk therapy. Talk therapy is a good place to talk about feelings and thoughts, and to learn ways to deal with them. It can also help to understand how your PDD has affected your life and to cope more effectively. Types of talk therapy include:
Joining a support group for people who are having problems like yours can also help. Ask your therapist or health care provider to recommend a group.
PDD is a chronic condition that can last for years. Many people recover fully while others continue to have some symptoms, even with treatment.
PDD also increases the risk of suicide.
When to Contact a Medical Professional
Call for an appointment with your provider if:
Call for help right away if you or someone you know develops signs of suicide risk:
American Psychiatric Association. Persistent depressive disorder (dysthymia). Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Arlington, VA: American Psychiatric Publishing, 2013;168-171.
Fava M, Østergaard SD, Cassano P. Mood disorders: depressive disorders (major depressive disorder). In: Stern TA, Fava M, Wilens TE, Rosenbaum JF, eds. Massachusetts General Hospital Comprehensive Clinical Psychiatry. 2nd ed. Philadelphia, PA: Elsevier; 2016:chap 29.
Review Date: 7/8/2018
Reviewed By: Ryan James Kimmel, MD, Medical Director of Hospital Psychiatry at the University of Washington Medical Center, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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