Aside from having a depressed mood and/or a loss of interest or pleasure, some of the following symptoms may also be present:

Another milder form of depression called Persistent Depressive Disorder is a chronic form of depression that can cause people to lose interest in things they normally enjoy, have low self-esteem, feelings of inadequacy, hopelessness, and difficulty with productivity. Symptoms last for more than 6 months and sometimes years. Because of the chronic nature, PDD can have a negative impact on relationships, employment, education, and other daily activities. People with this condition can be perceived as gloomy, pessimistic, or complainers.

Both of these forms of depression can be treated with psychotherapy alone, medication alone, or a combination of therapy and medication.