Problems and misfortunes are a part of life. Everyone experiences unhappiness, and many people may become depressed temporarily when things don't go as they would like. Experiences of failure commonly result in temporary feelings of worthlessness and self-blame, while personal losses cause feelings of sadness, disappointment and emptiness. Such feelings are normal, and they usually pass after a short time. This is not the case with depressive illness. ^{Footnote 6}