According to the definitions of most medical, psychological and psychiatric bodies, there is a commonality in the diagnosis of depression.
Most depression tests have a very similar framework. Almost without exception, clinical depression will be diagnosed if a certain number of feelings, that are signs of depression, are present over a certain period of time.
Current theory suggests those clinical depression results from complex interactions between brain chemicals and hormones that influence a person’s energy level, feelings, sleeping and eating habits. These chemical interactions are linked to many complex causes–a person’s family history of illness, biochemical and psychological make-up, prolonged stress, and traumatic life crisis such as death of a loved one, job loss, or divorce. Following are some of the common symptoms of clinical depression: