PDD or dysthymia, refers to a kind of depression that is present for a long period and might harm a person’s life quality. Even if the symptoms aren’t as severe as major depressive disorder, dysthymia can affect people for years and may be equally debilitating. We know it can be very difficult to manage persistent depressive disorder and our treatments are aimed at helping you recover for the long term. What is Persistent Depressive Disorder? Persistent depressive disorder is known by its common feature of an unpleasant or low mood that stays with the person most of the day and for more days than not, throughout at least two years (or one year for young people). Even though PDD often leads to normal-looking actions, those with PDD may feel without joy, sad most of the time or see the world with overwhelming pessimism. Common symptoms of persistent depressive disorder include: Low energy or fatigue Poor concentration or difficulty making decisions Sleep disturbances (insomnia or oversl...