Feeling sad sometimes is a normal part of life. Having depression, however, is different from being sad. People with depression may feel empty or hopeless, leaving them uninterested in activities that used to be enjoyable. Depression is a very common and very serious mental disorder. Fortunately, there are ways to treat depression and strategies to help people feel better. The Mental Illnesses and Disorders series lets readers know they are not alone, helping them make sense of commonly experienced problems as well as more specific challenges. Each book in the series, including Depression, guides readers through the challenges faced by individuals with mental illnesses and disorders, and provides an inclusive approach to understanding their causes, symptoms, and treatment. Book jacket.