Part 1 of Essay
Everybody's mood varies according to events in the world around them. People are happy when they achieve something or saddened when they fail a test or lose something. When they are sad, some people say they are 'depressed', but the clinical s that are seen by doctors differ from the low mood brought on by everyday setba ....

Part 2 of Essay
.... "Affective disorder" refers to changes in mood that occur during an episode of illness marked by extreme sadness (depression) or excitement (mania) or both. Depression is a disorder of affect. Affective disorders are predominantly disturbances of mood that are severe in nature and persistent despite the influence of external events. Depression is characterized by severe and persistent low mood, which is often unresponsive to the efforts of friends and family to cheer the sufferer up. Patients who suffer ....