The term “aggression” plays a crucial role in many theoretical concepts, including those related to the social sciences. Since this term is used
very frequently in a variety of theoretical concepts, it is impossible to give one universally and widely accepted definition of “aggression”.
The lack of reliable proofs supporting the existence of various theories on the origins of aggression, has caused that this conflict has yet to be
resolved. Relevant literature lists various reasons for the origins of aggressive behaviors including biological factors, as well as congenital or
acquired social considerations. The character, intensity and incidence of aggression depends on moral attitudes affirming certain ethical
values, praxeologic solutions, the influence of the environment and individual upbringing, as well as the general status, temperament, conscience,
and differences in reasoning on the part of the culprit and his or her victim.

This paper presents selected theories of aggression and reviews Polish and international literature dealing with the theories behind and
sources of aggression.

Nursing Topics 2011; 19 (3): 396–400