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Major Depressive Disorder (MDD) and Persistent Depressive Disorder (PDD) are two of the most common depressive disorders Social Workers see in practice, and both are important for the ASWB exam. Telling them apart comes down to a few key details: how long symptoms last, how many symptoms are present, and how the symptoms are patterned over time.
This guide covers the DSM-5-TR criteria for MDD and PDD, how to tell them apart, how depression shows up on the ASWB exam, and practice questions to test yourself.
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Quick answer: MDD vs. PDD
- MDD: 5 or more of 9 symptoms for at least 2 weeks, including depressed mood or loss of interest or pleasure.
- PDD: depressed mood most of the day, more days than not, for at least 2 years in adults (1 year in children and adolescents), plus at least 2 other symptoms.
- Key clue: duration. Two weeks points to MDD; two years of chronic symptoms points to PDD.
- They can overlap: people with PDD can also have major depressive episodes.
- On the exam: assess suicide risk first whenever a scenario mentions suicidal thoughts.
Jump to: Major Depressive Disorder · Persistent Depressive Disorder · MDD vs. PDD · On the ASWB Exam · Practice Questions · FAQs
1) Major Depressive Disorder (MDD)
MDD involves one or more major depressive episodes. An episode requires 5 or more of the following symptoms during the same 2-week period, representing a change from previous functioning. At least one symptom must be depressed mood or loss of interest or pleasure.
| Symptom | What It Looks Like |
|---|---|
| Depressed mood | Sad, empty, or hopeless most of the day, nearly every day (can be irritable mood in children and adolescents) |
| Loss of interest or pleasure (anhedonia) | Markedly less interest or pleasure in almost all activities |
| Weight or appetite change | Significant weight loss or gain, or decreased or increased appetite |
| Sleep changes | Insomnia or hypersomnia nearly every day |
| Psychomotor changes | Agitation or slowing that others can observe |
| Fatigue | Loss of energy nearly every day |
| Worthlessness or guilt | Excessive or inappropriate guilt, or feelings of worthlessness |
| Concentration problems | Difficulty thinking, concentrating, or making decisions |
| Thoughts of death or suicide | Recurrent thoughts of death, suicidal ideation, a plan, or an attempt |
Symptoms must cause significant distress or impairment and can’t be better explained by a substance or medical condition. A history of a manic or hypomanic episode rules out MDD and points toward a bipolar disorder. A helpful mnemonic for the symptoms is SIG E CAPS: Sleep, Interest, Guilt, Energy, Concentration, Appetite, Psychomotor, and Suicidal ideation, along with depressed mood.
Agents of Change packages include video and audio lessons, hundreds of practice questions, a personalized study plan, and 2 live study groups each month so you’ll be ready for test day!
2) Persistent Depressive Disorder (PDD)
PDD, formerly called dysthymia, is chronic depression. It requires depressed mood most of the day, more days than not, for at least 2 years in adults (or 1 year in children and adolescents, when mood can be irritable). During that time, the person must have at least 2 of the following:
| Symptom | What It Looks Like |
|---|---|
| Appetite changes | Poor appetite or overeating |
| Sleep changes | Insomnia or hypersomnia |
| Low energy | Fatigue |
| Low self-esteem | Persistent negative views of oneself |
| Concentration problems | Poor concentration or difficulty making decisions |
| Hopelessness | Feeling hopeless about the future |
The person has not gone without symptoms for more than 2 months at a time during that period. Because PDD is chronic, people often describe it as “just the way I am,” and it can go unrecognized for years. Under the DSM-5-TR, a person with PDD may also meet criteria for major depressive episodes, and clinicians use specifiers to describe that pattern.
3) MDD vs. PDD at a Glance
| Feature | MDD | PDD |
|---|---|---|
| Minimum duration | 2 weeks | 2 years (1 year in children and adolescents) |
| Symptoms required | 5 or more of 9 | Depressed mood plus 2 or more of 6 |
| Pattern | Episodes, which may recur | Chronic, with no symptom-free period over 2 months |
| Severity | Often intense during episodes | Often less intense day to day, but can be just as impairing over time |
| Overlap | Can occur on its own | Can include major depressive episodes |
Learn more about how the DSM shows up on the exam in our guide to the DSM-5-TR and the ASWB exam.
4) Depression on the ASWB Exam
| Topic | What to Know |
|---|---|
| Recognizing symptoms | Match vignette details, especially duration and number of symptoms, to the right diagnosis. |
| Differential diagnosis | Rule out bipolar disorder (any history of mania or hypomania), adjustment disorder (a response to a specific stressor), substance use, and medical causes. |
| Suicide risk | Whenever a scenario mentions suicidal thoughts, assess risk first, including plan, intent, means, and history. Review the ASWB exam safety-first rules. |
| Treatment | Know evidence-based treatments like CBT, interpersonal therapy, and behavioral activation, plus referral for a medication evaluation when appropriate. |
| Holistic care | Consider social support, community resources, and advocacy alongside therapy. |
| Culture | Depression can be expressed differently across cultures, including through physical complaints. Assess with cultural humility. |
| Ethics | Balance self-determination with safety, and protect confidentiality within its legal limits. |
Study Tips
- Use free ASWB flashcards and the SIG E CAPS mnemonic to memorize the criteria.
- Practice vignettes and focus on duration and symptom count clues.
- Explain the differences between MDD and PDD out loud, or teach them to a study partner. Agents of Change includes 2 live study groups each month.
- Practice role play to build assessment skills.
- Take full-length, timed practice exams to build stamina.
5) Practice Questions
Question 1: A client reports a depressed mood most of the day, more days than not, for the past two years. The client also describes low self-esteem, hopelessness, and difficulty concentrating, and says these feelings never go away for more than a few weeks. Which diagnosis should the Social Worker consider FIRST?
A) Major Depressive Disorder
B) Persistent Depressive Disorder
C) Bipolar Disorder
D) Adjustment Disorder with depressed mood
Correct Answer: B) Persistent Depressive Disorder
Rationale: A depressed mood more days than not for at least two years, with at least two additional symptoms, matches PDD. MDD is defined by episodes of 5 or more symptoms lasting at least two weeks, and the vignette doesn’t describe that pattern. Bipolar disorder requires a manic or hypomanic episode, and adjustment disorder is tied to a specific stressor and usually resolves within six months after the stressor ends.
Question 2: A client with a history of depression tells the Social Worker, “Sometimes I think everyone would be better off without me.” What should the Social Worker do FIRST?
A) Assess the client’s suicide risk, including plan, intent, and access to means
B) Refer the client for a medication evaluation
C) Help the client identify supportive people in their life
Correct Answer: A) Assess the client’s suicide risk, including plan, intent, and access to means
Rationale: The client’s statement suggests suicidal ideation, so safety comes first. The Social Worker must assess risk before moving to referrals or other interventions.
Question 3: A client lost her job six weeks ago and has felt sad and tearful since. She is sleeping poorly but is still enjoying time with friends and does not meet criteria for another mental disorder. Which diagnosis is MOST likely?
A) Adjustment Disorder with depressed mood
B) Major Depressive Disorder
C) Persistent Depressive Disorder
Correct Answer: A) Adjustment Disorder with depressed mood
Rationale: Her symptoms began within three months of a specific stressor and don’t meet criteria for MDD or PDD, which fits adjustment disorder. MDD requires 5 or more symptoms, and PDD requires at least two years of symptoms.
Want more practice? Start with our free ASWB practice questions. Agents of Change packages also include hundreds of practice questions with rationales and four full-length, 122-question practice exams. For more test-taking tips, see our ASWB exam strategies.
6) FAQs: MDD and PDD on the ASWB Exam
How can I tell MDD from PDD on the ASWB exam?
Look first at duration. Two weeks of 5 or more symptoms points to MDD. A depressed mood more days than not for two years (one year for children and adolescents) with at least two other symptoms points to PDD. Then check for clues that suggest other diagnoses, like a history of mania or a recent stressor.
What’s the best way to memorize the depressive disorder criteria?
Use the SIG E CAPS mnemonic, quiz yourself with flashcards, teach the criteria to someone else, make a comparison chart, and review at spaced intervals.
How important is culture when assessing depression?
Very important. Depression can show up differently across cultures, for example as physical complaints rather than sadness. Use cultural humility, ask about the client’s own understanding of their symptoms, and review the cultural competence standards in the NASW Code of Ethics.
7) Conclusion
MDD and PDD both cause real suffering, but they differ in duration, number of symptoms, and pattern. For the ASWB exam, focus on duration first, rule out other diagnoses, and always assess suicide risk when it comes up. Understanding these disorders well will serve you on test day and in practice.
► Learn more about the Agents of Change course here: https://agentsofchangeprep.com
About the Instructor, Dr. Meagan Mitchell: Meagan is a Licensed Clinical Social Worker and has been providing individualized and group test prep for the ASWB for over 11 years. From all of this experience helping others pass their exams, she created the Agents of Change course to help you prepare for and pass the ASWB exam!
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Disclaimer: This content has been made available for informational and educational purposes only. This content is not intended to be a substitute for professional medical or clinical advice, diagnosis, or treatment.
