Depression is a mental health illness when someone feels sad (including crying often), empty, or hopeless most of the time (or loses interest in or takes no pleasure in daily activities) for at least 2 weeks. Depression affects a person’s ability to work, go to school, or have relationships with friends and family. Depression is one of the most common mental health conditions in the United States. It is an illness that involves the body, mood, and thoughts. It can affect the way you eat and sleep, the way you feel about yourself, and the way you think about things.
It is different from feeling “blue” or “down” or just sad for a few hours or a couple of days. Depression is also different from grief over losing a loved one or experiencing sadness after a trauma or difficult event. It is not a condition that can be willed or wished away. People who have depression cannot just “pull themselves” out of it.