Learn from your sad feelings. We all feel sad sometimes. Maybe your best friend moved away. Maybe you failed to do as well as you had hoped at something. Maybe it's just one of those gray days when everything seems sad! Those sad feelings come from chemical reactions inside your brain. They may not feel very pleasant—but all your emotions, including sadness, are actually designed to help you. Find out what triggers sadness and why. Discover how you can cope with sadness—and what you can learn from it.