Hidden depression or "Smiling” Depression is not found in the official diagnostic manual for mental disorders. People of hidden depression shares depressive symptoms on the inside but appear cheerful, happy on the outside. As with people with depression, on the inside, they may have a sense of hopelessness, sadness and loss of motivation. On the outside, they may appear optimistic, having a good career and good social life. However, they may have difficulties sharing their feelings with other people, thus emotionally isolating themselves leaving them a sense of loneliness.