The core of fear is the threat of harm and the possibility of pain, physical or psychological. Fear is a complicated emotion, and how fear makes you feel can be different from one person to the next.
In some instances it can overwhelm and drain us, preventing us from living our lives fully, while in other scenarios it can save our lives by drawing our attention to an immediate threat and allowing us to react automatically in a way that will keep us alive and healthy.
Fear can have a very important function in our lives. Furthermore, each of the so-called negative emotions (including fear) can be positive in the sense that some people enjoy experiencing them. (That is why I think it is misleading just to divide emotions into positive and.
Read more on paulekman.com