Protest is a phenomenon marked by discomfort, disapproval, disagreement and dissent, and triggered due to the awareness and recognition of injustice, grievance and shared sense of belongingness to a group, particularly disadvantaged. Emotions and values also play their role in individual’s preparedness for and actual participation in protest. These precipitating factors are responsible for prompting, motivating and sustaining any protest action. Though there are various theoretical approaches to explain protest and social movement such as break down theories, resource mobilization theories, political opportunity approaches, and cultural theories, the scope of present paper is to discuss the psycho-social factors such as injustice, grievance, identity, emotions from social identity theoretical position reviewing some of the existing literature.