Depression is unpredictable as to when and at what age it strikes; what if anything causes depressive illness to occur when it will go away and when if at all the illness will return that is the bad news. The good news is that depression can be treated, and if treated properly, the recurrence is usually less severe and ends sooner.
             In the late Middle Ages, religious leaders believed depression was caused by possession
             of evil spirits. The German religious reformer Martin Luther wrote; "All heaviness of mind and melancholy comes of the Devil." Through the years, depression has been treated with such remedies as whipping, bloodletting, exorcism, and soothing baths.
             The causes of Depression: Psychological, Genetic, and Environmental. Those are the
             Researchers began studying adopted children, who inherited their genes from their biological parents, and their environment from their adopted parents. If depression were caused by environment, it would be expected that a child born of a depressed parent would not be depressed if adopted and raised by non-depressed parents.
             Depression can skip generations. For example, a grandparent can suffer from depression and that does not mean that his/her children will inherit it, but their grandchildren may have the illness.
             Studies of twins have also shown compelling evidence that depression is genetic illness. Researches have discovered the same type of depression in pairs of identical twins who were raised by different adoptive parents.
             Besides genetic origins of depression, there are psychological reasons that, either acting alone cause a person to become depressed, or cause depression when activated in the form of stress in a person who is genetically predisposed to depressive illness. The main psychological cause of depression cause of depression is attachment and loss. What is inherited in depression is a chemical imbalance in the brain
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