Aggression is any behaviour performed with the aim of harming another man or woman who is prompted to keep away from that damage. There are various psychological theories of aggression. The three personality kinds- psychopathy, Machiavellianism, and narcissism are connected with high ranges of aggression, lack of empathy, and decreased emotional responding. The alternative psychological theory is founded on the ‘Big five’ personality tendencies, Cognitive Labelling and Excitation transfer theory, Cognitive Neoassociation theory. It could additionally be explained by social theories like Frustration-Aggression speculation, The Social learning concept, Social information Processing principle, Script theory, General Aggression model. There are few predictors of aggression which encompass the patterns of infantile attachment, impulsivity and inattention in preschool years, subnormal IQ etc. Genetic Predispositions may additionally play a part in the occurrence of aggression. The genetic markers of aggression include a polymorphism in the monoamine oxidase A promoter gene (MAOA) and a variant inside the 5-HT serotonin transporter gene. Environmental elements encompass provocation, weapons, exposure to violent environments, and social rejection. Substance addictions also are accountable for inflicting aggression. Intoxication with alcohol is associated with murders, attacks, rapes, and intimate partner violence, due to reduced capability of restraining their violent impulses. Different materials like stimulants, amphetamines, and methamphetamines which induce disinhibition and/ or increased physiological arousal may additionally lead to aggression.

Keywords: Aggression; Psychological theories; Social theories; Genetic predispositions; Environmental factors; Substance dependence.