Sadness is a feeling of unhappiness resulting from the experience of pain or loss. It is something we each go through at one time or another in our lives and it could emerge from personal or situational factors, or a combination of both.
The reasons for this sadness could range from anywhere between losing something of value, to failure to achieve desired outcome, to unfulfilled goals in specific areas of life. There are many different types of losses such as loss of health, hope, wealth, companionship or safety, and each of these could lead to feelings of sadness. The experience of sadness can last from a few minutes, to days, weeks, or months, depending on the various causes and how they affect us.