Affective disorder is a disorder in affection (emotion) or the mood (mood) of a person. And the patient may experience depression or maniac (unnatural excitement), or may alternate between the bead and depression.
The causes of depression are failure at school, at work, or failure in love. And depression is considered abnormal when depression does not make sense and continues until the time most people have recovered.
Depression in normal people such as melancholy (sadness, heartbreak and despair) is characterized by dissatisfaction, decreased activity, and pessimism. While abnormal depression such as extreme anxiety to respond to stimuli and accompanied by a decrease in self-worth, incompetence, delusion, and despair.