Many of us suffer through mild phases of sadness. It may be brought on by a relationship breakup, a loss of family member or job loss. These feelings could last several months but we go on with are normal lives. It could be difficult to discern where normal sorrow's end and clinical depression begin.
Clinical depression is an illness that effects us psychologically, biologically and socially. It may be brought on by sadness, anger and according to some researchers genetically. Although it is hard to classify clinical depression, at a biological stand point it takes a direct route.