Persistent Depressive Disorder

Definition and Clinical Features

• The disorder is characterized by depressed mood on most days for at least 2 years, according to the American College of Physicians, as published in the Annals of Internal Medicine 1
• Patients typically present with flat affect or aprosodic speech that may be misinterpreted as sadness or indifference, as noted in the journal Stroke 2

Key Symptoms

• Persistent depressed mood most days for at least two years is a key symptom, as reported in the Annals of Internal Medicine 1
• Loss of interest or pleasure in activities, sleep disturbances, decreased appetite, fatigue, feelings of hopelessness, and difficulty with concentration or decision-making are common symptoms, as described in the journal Stroke 2

Distinguishing Features

• Dysthymia differs from melancholic depression, which is characterized by more severe symptoms, including marked loss of interest in all activities, as stated in Praxis Medical Insights 3