Persistent Depressive Disorder (PDD) affects approximately 1.5% of adults per year. Many people will not be given a diagnosis, however, due to the subtlety of the symptoms compared to Major Depression. The symptoms can also start to feel like part of your personality after a few years. However, this is not the case, and PDD is a known condition that can be treated.
The guide below will tell you everything you need to know about persistent depressive disorder, how it is diagnosed and which treatments work, including antidepressants and therapies.
What Is Persistent Depressive Disorder (PDD)?
To define persistent depressive disorder (PDD), it is a long-term form of depression, earlier called dysthymia. People often search for it as “what is persistent mood disorder”. Symptoms are usually milder than in major depression, but they last much longer. In adults, the low mood continues for at least two years.
PDD is common. Roughly 1.5% of adults experience it in a given year, and many never receive a diagnosis because they have “functioned” through it for so long. If your mood has been low for years, it may be worth a professional look. Our guide on major vs persistent depressive disorder explains how the two differ.
What Are the DSM-5 Criteria for Dysthymia?
Doctors use the DSM-5 to diagnose PDD. In adults, the criteria are:
Depressed mood most of the day, on more days than not, for at least 2 years (1 year in children and teens)
Two or more of these symptoms while depressed: poor appetite or overeating, sleeping too little or too much, low energy, low self-esteem, poor concentration or difficulty making decisions, and feelings of hopelessness
No symptom-free period longer than 2 months during those two years
No history of a manic or hypomanic episode
Symptoms that cause real distress or affect work, relationships, or daily life
Only a trained clinician can confirm this. A psychiatric assessment and diagnosis also checks for look-alikes and overlapping conditions, such as bipolar disorder, thyroid problems, or borderline personality disorder, so the treatment plan fits you.
What Are the Treatment Options for Persistent Depressive Disorder?
1. Persistent depressive disorder medication
Antidepressant medication is often the first step, especially when symptoms have lasted for years. The usual choices are:
SSRIs such as sertraline, escitalopram, and fluoxetine
SNRIs such as venlafaxine and duloxetine
Other options, such as bupropion or mirtazapine, depending on your symptoms
These medicines take time. Most people notice a change after 4 to 8 weeks, and the dose may need adjusting. Never stop them suddenly. Read more in our guide to the role of medication in treating depression and anxiety.
2. Psychotherapy
Therapy helps with the thinking and behaviour patterns that keep low mood going:
Cognitive behavioural therapy (CBT) helps you spot and change negative thought loops.
Interpersonal therapy works on relationships and life transitions.
CBASP, a therapy designed for chronic depression, helps you see how your behaviour affects others.
3. Lifestyle support
Habits will not replace treatment, but they make it work better:
About 150 minutes of moderate exercise a week
A steady sleep schedule of 7 to 9 hours
Daily daylight and social contact
Less alcohol, which worsens mood
4. Intensive or inpatient care
If symptoms are severe, if you have thoughts of self-harm, or if home care is not enough, a structured programme with a psychiatrist and therapy team can help. This is also useful when PDD occurs alongside substance use or other conditions.
How Do You Begin Persistent Depression Treatment?
Book a psychiatric assessment, be honest about how long you have felt this way. Mention sleep, appetite, energy, and any past episodes.
Agree on a plan, your doctor will suggest medication, therapy, or both.
Treatment for long-standing depression works gradually. Track your mood weekly to see slow progress.
Regular reviews help adjust doses and prevent setbacks.
How Long Does Depression Usually Last?
It depends on the type. A major depressive episode often lasts several months, and treatment can shorten it. PDD, by definition, lasts at least two years, and without treatment it can continue for many years. This is why early help matters. With the right treatment, many people see real improvement within weeks to months, and long-term remission is possible.
How to Live With PDD: 5 Coping Skills for Depression
Treatment works best alongside daily support. These five coping skills for depression are simple and realistic:
Fixed wake-up, meal, and sleep times steady your body clock.
Even a 20-minute walk lifts the mood.
Do one thing, then the next.
Talk to one trusted person every day, even briefly.
Ask, “Would I say this to a friend?”
Are There Foods That Help Fight Depression?
Food alone cannot treat PDD, but diet matters. In the SMILE trial, adults with depression who followed a Mediterranean-style diet for 12 weeks were far more likely to reach remission than those who got social support only (about 32% vs 8%). Aim for:
Vegetables, fruits, and whole grains
Pulses, nuts, and seeds
Oily fish, or other omega-3 sources
Less sugar, ultra-processed food, and alcohol
Recovering After Depression: Rebuilding a Steady Life
“Back to normal” usually means building a steadier version of life, not flipping a switch. Stay on treatment as advised, rebuild routines slowly, and watch for early warning signs such as poor sleep or withdrawal. A structured relapse prevention and aftercare plan keeps your gains protected.
