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.
Depression is not one single condition — it takes several forms that share core symptoms (low mood, loss of interest) but differ in their pattern, timing, and triggers. The main types are major depressive disorder, persistent depressive disorder, seasonal affective disorder, perinatal depression, and the depression that occurs as part of bipolar disorder. Knowing which type fits helps guide the right treatment.
Key facts
- Major depressive disorder is common: NIMH estimates about 8% of U.S. adults have a major depressive episode in a given year.
- Types differ in pattern and duration, not just severity (NIMH).
- An accurate diagnosis matters because treatment can differ by type — for example, bipolar depression is managed differently from major depression (NIMH, MedlinePlus).
Major depressive disorder
Episodes of persistent low mood and loss of interest, with other symptoms, lasting at least two weeks. Episodes can recur over time. See depression symptoms.
Persistent depressive disorder (dysthymia)
A chronic, often lower-grade depression lasting two years or more. It can feel like “just how I am.” Learn more in persistent depressive disorder. When a major episode lands on top of it, that’s double depression.
Seasonal affective disorder
Depression that follows a seasonal pattern, most often beginning in fall or winter and easing in spring. It may respond to light therapy alongside standard treatment.
Perinatal (including postpartum) depression
Depression during pregnancy or after childbirth. It is common, treatable, and not a reflection of being a “bad” parent — and getting help protects both parent and baby.
Depression in bipolar disorder
Bipolar disorder includes depressive episodes plus periods of elevated mood (mania or hypomania), which changes treatment. See depression vs bipolar.
From our clinical review. Getting the type right is not academic. The same low mood can need very different care — and treating bipolar depression as if it were ordinary depression, for instance, can backfire. That’s why a careful evaluation, including a history of any high or energized periods, is so important.
Whatever the type, depression is treatable. Explore depression treatment options or take a private, two-minute depression self-check.
Frequently asked questions
What are the different types of depression?
Common types include major depressive disorder, persistent depressive disorder (dysthymia), seasonal affective disorder, perinatal (including postpartum) depression, and the depression that occurs in bipolar disorder. They share core symptoms but differ in pattern and timing.
Does the type of depression change the treatment?
Sometimes. Most types respond to therapy and medication, but specifics matter — for example, bipolar depression is treated differently from major depression, and seasonal depression may also involve light therapy. An accurate diagnosis guides the plan.
What is the most common type of depression?
Major depressive disorder is the most familiar form, defined by episodes of low mood and loss of interest lasting at least two weeks. Persistent depressive disorder is a longer-lasting, often lower-grade form.
Sources
- Depression — National Institute of Mental Health (NIMH)
- Depression — MedlinePlus, U.S. National Library of Medicine
- Depressive disorder (depression) — Fact sheet — World Health Organization (WHO)
Reviewed against the sources above. This page is educational and is not medical advice.