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Behavioral and social scientists have different theories about aggression. As outlined earlier, Freudians believe that aggression, like sexuality, is an innate drive or instinct in each of us (Stoff et al., 1997). Others theorize that it is not an inborn drive but a response to frustration that every human being experiences almost from birth. Although there are several different ways in which the causes of aggression can be grouped, two broad divisions consist of social and biological explanations. Social Causes. Although there are many social factors involved in aggression, two overarching theories that involve social factors (external stimuli) are briefly outlined.
Biological Causes. Research is beginning to indicate that biological processes (internal stimuli) may serve a role in predisposing to aggression. Five specific processes are selected for brief description: (1) brain dysfunction, (2) testosterone, (3) serotonin, (4) birth complications, and (5) nutrition deficiency.
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Causes and Symptoms 
