What you might be experiencing
Major depressive disorder (MDD) often arrives with an unmistakable weight. Sleep shifts dramatically, appetite changes, concentrating feels like trying to think through wet concrete, and the things that used to interest you go flat. These episodes last at least two weeks and usually mark a clear departure from how you normally feel. When they lift — fully or mostly — there's a recognizable return to yourself.
Persistent depressive disorder (PDD, sometimes called dysthymia) works differently. The mood is lower than it should be, but not always dramatically so. The more defining feature is duration: depressed mood most days for at least two years in adults, or one year in children and adolescents. Low energy, poor self-esteem, difficulty making decisions, a background hum of hopelessness — these symptoms can become so familiar they start to feel like personality rather than illness. Many people with PDD don't seek help because they've normalized how they feel.
Some people experience both at once. A long-standing depressive baseline — the PDD — gets periodically interrupted by full major depressive episodes that are severe enough to be unmistakable. This combination is sometimes called double depression, and it's worth knowing because it means treatment may need to address both the chronic foundation and the acute episodes.
What can help
Getting clarity on which pattern fits your experience is genuinely useful, because it shapes the kind of help that works best. A good starting point is thinking about your history honestly: has depression been episodic, with stretches where you felt like yourself in between? Or has low mood been a near-constant backdrop for years, with occasional spikes into something worse? That distinction gives a clinician something concrete to work with.
Both major depressive disorder and persistent depressive disorder respond to psychotherapy and, where appropriate, medication — but the emphasis may differ. Persistent depressive disorder in particular often benefits from therapy approaches that address long-standing patterns of thought and self-perception, since the condition has typically had years to shape how someone sees themselves and their future. Neither condition is well-served by waiting to see if things improve on their own, especially if symptoms have already persisted for months or years.
One practical step you can take before or between appointments: track your mood over time, even briefly. Noting whether you have good stretches or whether low mood is consistently present helps build the picture a clinician needs. Avoiding the assumption that chronic low mood is simply who you are is not a small thing — that reframe alone opens the door to getting support you may have talked yourself out of seeking.
When to reach out
Reaching out for support is not a sign that things have hit rock bottom — it's a reasonable response to symptoms that are affecting how you live, work, or feel about yourself. If low mood has been present for weeks or months, if you've lost interest in things that used to matter, or if you've been quietly managing a sense of hopelessness for years without telling anyone, those are all sufficient reasons to talk to someone.
More urgently: if you're experiencing thoughts of self-harm or suicide, feel like you can't keep yourself safe, or notice symptoms worsening rapidly, those are signs to seek help without delay. A primary care provider, therapist, or psychiatrist can conduct an evaluation and help you understand what you're dealing with — you don't need to have a diagnosis in hand before reaching out.
If you're in the US and need immediate support, you can call or text 988 (Suicide & Crisis Lifeline) at any time. If you are in immediate danger, go to the nearest emergency room or call 911.