Persistent Depressive Disorder: Chronic, Low-Grade Depression

Persistent Depressive Disorder (PDD), sometimes called dysthymia, is a longer-lasting but often milder form of depression — the kind that can feel less like an episode and more like a permanent backdrop.

How It's Different from Major Depression

Where Major Depressive Disorder tends to show up in distinct episodes, PDD is defined by duration: a depressed mood most days for at least two years (one year in adolescents). The day-to-day intensity is often less severe than a major depressive episode, but the sheer length of time it sticks around can make it just as disruptive.

Common Signs

• Low energy or chronic fatigue
• Poor self-esteem or persistent self-criticism
• Difficulty concentrating or making decisions
• A pervasive sense of hopelessness
• Changes in appetite (too little or too much)
• Sleep that's disrupted or unsatisfying
• Pulling back from people or activities

Why It's Often Missed

Because PDD comes on gradually and lasts so long, many people come to see it as just "who they are" rather than something treatable. That's one of the most common reasons it goes unaddressed for years.

Treatment Approach

The same comprehensive evaluation process applies here — we want to understand the full timeline of your symptoms, not just how you're feeling this week. Medication is often helpful for PDD, and because it's a chronic condition, ongoing monitoring and attention to patterns of thinking tend to matter more over the long run.