Dysthymia, now known as Persistent Depressive Disorder, is a chronic form of depression characterized by a low mood lasting for at least two years in adults. Individuals with dysthymia may experience symptoms such as fatigue, low self-esteem, and difficulty concentrating, but these symptoms are generally less severe than those of major depressive disorder. This condition can significantly impact daily life, making it challenging to maintain relationships and perform at work or school. Treatment options often include therapy, such as cognitive-behavioral therapy, and medications like antidepressants, which can help manage symptoms and improve overall well-being.