PDD: What to Look For
A child with persistent depressive disorder appears to be irritable, moody, sad or pessimistic over a long period of time. Other symptoms can include behavior problems, poor performance at school, low self-esteem, and difficulty interacting with other children in social situations. The intensity of individual symptoms may ebb and flow over a period of years, but typically symptoms do not disappear for over two months at a time. Because the disorder often occurs in children at the same time as other psychological disorders with similar symptoms, it can be particularly difficult to diagnose.