This document discusses the difference between feeling down or sad and clinical depression. It notes that while everyone feels sad sometimes, depression is characterized by feelings of sadness, hopelessness, and worthlessness that persist for weeks and interfere with daily life. The document provides a checklist of symptoms of depression, including changes in sleep, appetite, concentration, and thoughts of death. It encourages anyone experiencing several depressive symptoms for more than two weeks to seek help from a doctor or counseling services.