Depression is a serious mental health condition that can be diagnosed in someone who experiences symptoms such as extreme sadness every day for at least two weeks. The symptoms of depression will eventually take a toll on a person's everyday life, so it's important to seek help from a mental health professional.
This is a form of long-term depression. We also call it "chronic depression." It can make you feel sad or irritable on most days, and this mood can last for years. With this form of depression, your feelings are milder than they are in someone who has major depression.