According to its valence, there are positive emotions and negative emotions. Positive emotions are, for example: interest, enthusiasm, boredom, laughter, empathy, action, curiosity. Negative emotions are, for example: apathy, grief, fear, hatred, shame, blame, regret, resentment, anger, hostility.
The bodily changes, urges to act and the facial expressions produced by positive emotions are not as specific or as obviously relevant to survival as those sparked by negative emotions.
Barbara Fredrickson developed the Broaden-and-Build Theory of Positive Emotions to explain the mechanics of how positive emotions were important to survival. Fredrickson suggests that positive emotions expand cognition and behavioral tendencies which increase the number of potential behavioral options. Fredrickson casts emotions as leading to changes in "momentary thought-action repertoires" - a range of potential actions the body and mind are prepared to take.
Even though a positive emotional state is only momentary, the benefits last in the form of traits, social bonds, and abilities that endure into the future. The implication of this work is that positive emotions have inherent value to human growth and development and cultivation of these emotions will help people lead fuller lives.
Negative Emotions and the Body
Rage, anger, arrogance, uncontrolled desire, and violence, as well as self-pity, melancholy, loneliness, boredom, dissatisfaction, inadequacy or envy are few of the most common examples of expressing negative emotions.
Continuous accumulation of negative emotions within the mind for a longer period of time can pervert the entire persona and can badly hamper the health and happiness. At earlier stages, negative emotions slowly entraps the mind to the point of grasping it wholly, affecting the physical body badly.