Emotions play an important role in the life of human beings. Person experiences various emotions during waking hours. There is a strong physiological basis for each emotion experiences for example an individual may be anxious about grade in academic level, may get real satisfaction when my instructor praises me in class with excellent remark (emotion-pleasure), mat get terrorised when he received blank calls repeatedly and someone threatened him (emotion-fear), may feeling pain due to psychological pressure of studies (emotion-distress) and many more.

Mostly common emotions which a normal person experiences in his daily life include fear, aggression, joy, envy, pleasure, distress, grief, sadness, elation, excitement, surprise, guilt, interest etc.These emotions are associated with strong physiological reactions. Physiological component may be internal and expressive body changes. Different kind of emotions differs in physiological reactions from each other. . For instance, if we consider fear and anger, they have many bodily changes common that are due to increased activity in the sympathetic nervous system. In both Fear, and anger, the heart rate usually increased. When we felt afraid, it is difficult for us to breath. Frequency of anger leads to high blood pressure many times. During the course of aggression, sometimes blood vessels in the muscles dilated so body is more prepared for action. Muscles tension and breathing rate were tending to increase in fear and anger every time. But increase in muscle tension was usually greater in anger than fear. In the same way, rise in blood pressure was generally higher in anger than fear. While breathing rate and depth were said to increase more in fear than anger. These patterns of bodily changes helped us to deal with threatening situation. They worked as emergency reactions to adjust in the situation. It has been recognised faster heart rate in joy, anxious, sadness and shame.

Experiencing an emotion led to behavioural expressions of emotions. It can be observed by body language. Gaze, gestures and walk changes during emotional activity of grief, sadness, distress, anger and joy. During disturbing state of sadness and distress, many times person gives faked smile rather genuine smile. In fear and anger state walking style and posture completely changes. Wide-open eyes, flared nostrils and an open mouth accompanied facial expressions of emotion in surprise, anxiousness. During fear, facial expression are realised as a chocking of voice, abnormal lip movement. In the state of sadness, the lips, the eyes and nostrils remains shut. Movement of muscles around eyes and muscles that pull up the lip recognise us many emotions.

It can be realized that emotional feelings results from the interpretation of bodily changes.