Most people feel down once in a while that is normal, however, if someone is sad most of the time to the extent that it is affecting their daily life, they may have clinical depression.
Depression is a serious condition that leads to a range of behavioral and physical symptoms that affect a person’s mind and body, and impact all aspects of everyday life including changes in sleep, appetite, energy level, concentration, daily behavior or self-esteem. It can come from chemical imbalances in the brain, hormonal changes, medications or other things happening in a person’s life.
It is also one of the most common mood disorders, with around 15 million adults in the U.S. experiencing one major depressive episode every year. It can happen to anyone, at any age, and to people of any race or ethnic group. At any time, 3 to 5 percent of adults suffer from it, with as many as 8 out of every 100 teens having serious forms of it.