Some people can’t remember the last time they felt truly good. Not in crisis, not unable to get out of bed, but steadily flat, tired, and self-critical for as long as they can remember. They may function well at work and home, so no one, including themselves, sees it as depression. That pattern may be persistent depressive disorder, a chronic form of depression that often goes unrecognized for years. This guide explains what it is, how it differs from major depression, what double depression means, and how chronic depression is treated.
The good news is that persistent depressive disorder responds to treatment, even after many years. Recognizing it is often the hardest step.
What Is Persistent Depressive Disorder?
Persistent depressive disorder is a form of depression in which depressed mood is present most of the day, more days than not, for at least two years in adults, along with other symptoms such as low energy, poor sleep, low self-esteem, poor concentration, or hopelessness. During that time, symptoms never lift for more than two months at a stretch.
The National Institute of Mental Health estimates that 1.5% of U.S. adults had persistent depressive disorder in the past year, with higher rates in women (1.9%) than men (1.0%), and that 2.5% experience it at some point in life. Past-year rates were highest in adults aged 45 to 59, at 2.3%.
Share of U.S. adults with persistent depressive disorder in the past year.
Common Dysthymia Symptoms
Common dysthymia symptoms include ongoing low or irritable mood, low energy or fatigue, changes in appetite or sleep, low self-esteem, trouble concentrating or making decisions, and feelings of hopelessness, lasting two years or more. Because symptoms are steady rather than dramatic, people often adapt to them and stop noticing.
- Mood: feeling down, empty, or irritable most days.
- Energy: persistent tiredness, even after rest.
- Self-view: harsh self-criticism or feeling inadequate.
- Thinking: trouble focusing or making decisions.
- Outlook: pessimism or hopelessness about the future.
Many people with persistent depressive disorder describe life as gray rather than dark. They may still meet obligations, but little feels satisfying, and the effort it takes is exhausting.
Persistent depressive disorder also tends to shape how people see themselves. After years of low mood, harsh self-criticism can feel like an accurate description rather than a symptom. Part of treatment is learning to tell the difference between who you are and what the depression has been telling you.
When low mood has been there for years, it can feel like who you are. Often, it's a treatable condition wearing the mask of personality.
High-Functioning Depression and Why It’s Missed
High-functioning depression is an informal term for depression that doesn’t stop someone from working or caring for others, and persistent depressive disorder often looks like this: the person keeps going, so the depression stays hidden. Because symptoms usually begin early, sometimes in adolescence, people may believe they’ve always been this way.
Our article on high-functioning depression explains how to recognize it. The key question isn’t whether you can function, but whether you’ve been carrying low mood, fatigue, and self-criticism for years.
| Persistent depressive disorder | Major depressive episode | |
|---|---|---|
| Duration | At least 2 years | At least 2 weeks |
| Severity | Often milder day to day | Often more severe |
| Course | Chronic, steady | Episodic |
| Can they overlap? | Yes, called double depression | Yes |
Other conditions can look similar. Thyroid problems, sleep disorders, chronic pain, and some medications can cause long-standing fatigue and low mood. Bipolar II disorder can also be mistaken for chronic depression if periods of elevated mood are missed. That’s why a careful evaluation looks at the whole picture, including labs when needed.
Has low mood lasted for years?
A careful evaluation can help. By telehealth across South Carolina and New York.
Double Depression
Double depression happens when a major depressive episode develops on top of persistent depressive disorder, so a person with long-standing low mood experiences a period of more severe depression. It can feel like falling from gray into black, and it often prompts people to seek help for the first time.
Chronic forms of depression are common. A large national survey of 43,093 adults found 12-month and lifetime prevalences of 1.5% and 3.1% for chronic major depressive disorder, and 0.5% and 0.9% for dysthymic disorder. The authors noted that 10% to 30% of people with major depression in clinical samples develop a chronic course despite treatment, and that people with chronic depression continue to face substantial unmet treatment needs.
Degree of impairment among U.S. adults with PDD in the past year.
Because persistent depressive disorder starts early and lasts for years, many people have never had a stretch of feeling well to compare against. That can make it harder to notice progress. Rating scales and regular check-ins help show change that might otherwise go unnoticed.
Chronic Depression Treatment
Chronic depression treatment usually combines psychotherapy, such as cognitive behavioral therapy or therapies designed for chronic depression, with antidepressant medication, and combining the two often works better than either alone. Treatment may take longer than for a single episode, and the goal is lasting remission, not just feeling a little better.
- Get a careful evaluation. Confirm the diagnosis and rule out bipolar disorder or medical causes.
- Set remission as the goal. Aim for feeling well, not just less bad.
- Combine approaches. Consider therapy plus medication, which often works best.
- Measure progress. Track symptoms with a scale like the PHQ-9.
- Adjust as needed. Change dose, medication, or therapy approach if progress stalls.
The National Institute of Mental Health notes that depression, including its chronic forms, is treatable with medication, psychotherapy, or both. If first treatments don’t work, other options exist. Our guides to treatment-resistant depression and how long antidepressants take to work explain next steps.
Some people worry that treatment will change who they are. In practice, many people describe the opposite: feeling more like themselves than they have in years.
Years of gray
Low mood, fatigue, and self-criticism that have been there so long they feel like personality.
Recognition and a real plan
An evaluation that names chronic depression and treatment aimed at full remission.
Feeling like yourself again
Energy, interest, and a kinder inner voice, sometimes for the first time in years.
Dr. Gabriella Farkas, MD PhD
Board-certified adult psychiatrist with a PhD in neuroscience. Dr. Farkas specializes in depression that hasn’t fully responded and aims for remission, not just improvement.
About Dr. Farkas →When to Get Help
Get help if low mood, fatigue, and self-criticism have lasted two years or more, even if you’re still functioning, or if you’ve noticed a recent drop into more severe depression. You don’t need to be in crisis to deserve care.
A comprehensive adult psychiatric evaluation can clarify whether you’re experiencing persistent depressive disorder, major depression, or something else, such as bipolar disorder or a medical condition. Our overview of depression covers the full picture. If you’re having thoughts of suicide, call or text 988 in the US.
Key Terms
- Persistent depressive disorder
- Depression lasting at least two years in adults, formerly called dysthymia.
- Dysthymia
- An older term for chronic, lower-grade depression.
- Double depression
- A major depressive episode occurring on top of persistent depressive disorder.
- Remission
- Minimal or no symptoms, the goal of depression treatment.
Common Questions About Persistent Depressive Disorder
What is persistent depressive disorder?
Persistent depressive disorder is depression that lasts most of the day, more days than not, for at least two years in adults, with symptoms such as low energy, poor self-esteem, and hopelessness. It was formerly called dysthymia. It's often milder but longer-lasting than major depression. It's treatable. Many people mistake it for personality.
What is the difference between dysthymia and depression?
Dysthymia, now called persistent depressive disorder, is chronic depression lasting at least two years and often milder day to day, while a major depressive episode lasts at least two weeks and is often more severe. They can overlap. Both are treatable. An evaluation can clarify which applies. Treatment is tailored. A psychiatrist can help sort it out.
What is double depression?
Double depression is when a major depressive episode develops on top of persistent depressive disorder, so someone with long-standing low mood experiences a period of more severe depression. It often prompts people to seek help. It's treatable. Both layers are addressed. Remission is the goal. A psychiatrist can help sort it out.
Can persistent depressive disorder be treated?
Yes, persistent depressive disorder can be treated, usually with psychotherapy and antidepressant medication, and combining them often works better than either alone. Treatment may take longer than for a single episode. Remission is possible. Adjustments may be needed. Many people feel better than they have in years. A psychiatrist can help sort it out.
Is high-functioning depression real?
High-functioning depression isn't a formal diagnosis, but it describes a real pattern in which someone keeps working and caring for others while living with ongoing depression, often persistent depressive disorder. Functioning doesn't mean you're fine. Symptoms still deserve care. An evaluation helps. Treatment works. A psychiatrist can help sort it out.
How common is persistent depressive disorder?
NIMH estimates that 1.5% of U.S. adults have persistent depressive disorder in a given year and 2.5% at some point in life, with higher rates in women and people aged 45 to 59. About half have serious impairment. Many aren't diagnosed. You're not alone. Help is available. A psychiatrist can help sort it out.
Can I get treatment for persistent depressive disorder by telehealth?
Yes, Dr. Farkas evaluates and treats persistent depressive disorder by secure telehealth for adults in South Carolina and New York, with rating scales to track progress toward remission. You'll need a private space. A device with a camera works well. Prescriptions go to your pharmacy. Follow-ups use the same platform. A psychiatrist can help sort it out.
Years of low mood can change.
Treatment aimed at full remission.
Sources
- National Institute of Mental Health. “Persistent Depressive Disorder (Dysthymic Disorder).” NIMH Statistics, National Comorbidity Survey Replication data. https://www.nimh.nih.gov/health/statistics/persistent-depressive-disorder-dysthymic-disorder
- Blanco C, Okuda M, Markowitz JC, Liu SM, Grant BF, Hasin DS. “The epidemiology of chronic major depressive disorder and dysthymic disorder: results from the National Epidemiologic Survey on Alcohol and Related Conditions.” Journal of Clinical Psychiatry, 2010;71(12):1645–1656. https://pmc.ncbi.nlm.nih.gov/articles/PMC3202750
- National Institute of Mental Health. “Depression.” NIMH Health Topics. https://www.nimh.nih.gov/health/topics/depression
Educational content only. This article does not constitute medical advice and does not establish a doctor-patient relationship. If you are in crisis, call or text 988 (Suicide & Crisis Lifeline) or call 911. Treatment decisions should be made with a qualified clinician familiar with your circumstances. Last reviewed: September 2026.