Persistent depressive disorder, also known as dysthymia, is a type of chronic depression that lasts for at least two years in adults and one year in children and adolescents. Individuals with this condition often experience a low mood, feelings of hopelessness, and a lack of interest in daily activities. Symptoms can vary in intensity but generally persist over time, affecting daily functioning. Unlike major depressive disorder, the symptoms of persistent depressive disorder are less severe but more enduring. People may also experience changes in appetite, sleep disturbances, and difficulty concentrating. Treatment options include psychotherapy, medication, or a combination of both to help manage symptoms and improve quality of life.