Dysthymia, now known as Persistent Depressive Disorder, is a long-term form of depression characterized by a consistently low mood that lasts for at least two years in adults. Symptoms may include sadness, low energy, poor self-esteem, difficulty concentrating, and feelings of hopelessness. Although the symptoms are often less severe than major depression, they can significantly affect daily life, relationships, and overall well-being. Early diagnosis and treatment, including therapy and lifestyle changes, can help manage the condition effectively.