The exact cause of depression is unclear. However, one possible explanation revolves around the way the chemicals in your brain talk to one another.
Women are twice as likely to get depressed as men.
Recent studies show the average age has dropped from the late 40s to the late 20s. Depression rates go down as socioeconomic status rises. Depression runs in families. It is two or three times more likely if other members of your family suffer from it. Separated or divorced people are at a two to four times greater risk for depression.