Clinical depression ranges in seriousness from mild, temporary episodes of sadness to severe, persistent depression, etc. It is very different from common experience of feeling unhappy, miserable or fed up for a short period of time. Signs and symptoms include depressed mood, reduced interest or feeling no pleasure, significant loss of weight, weight gain, fatigue or loss of energy, etc.
Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Hindi 