A continuous feeling of sadness could be just a dark mood, or it could be persistent depressive disorder that lasts for a long period of time. Persistent Depressive Disorder, or PDD, is not as severe ...

With fewer symptoms and less severe presentation, persistent depressive disorder (PDD) differs from clinical depression. If ...

You could have what some people call "high-functioning depression" if your symptoms don't have a major impact on your daily ...