The concept of alienation or alienation means to be alien, that is, to be outside oneself or to see oneself as someone strange. In today's society there are several alienations that all humanity suffers, for example, not feeling part of the planet exploits, devastates and pollutes it endlessly.Other alienations are ideological, political, religious and sexual, to name a few. All of them are the product of civilization and will be overcome when we culminate the struggle of social and sexual classes, with which we will be able to reconnect with our humanity, with our fellow men, with nature and with ourselves.This work deals with some of the forms of alienation, to show that humanity lives outside of itself, so that we become aware of the oppression and injustice that is experienced in the division of humanity into social and sexual classes, and we can overcome them in communism.