This paper aims to achieve a purely descriptive approach to Nietzsche's work, specifically his text The Genealogy of Morals. It refers also to some elements of his biography and some difficulties that came with the interpretation of his texts at some point in history. It seems relevant to us to contribute to the dissemination of this philosopher's thinking among psychiatrists, doctors and health workers. The vast and fruitful work of the philosopher Friedrich Nietzsche has been schematized for academic purposes in three stages. The genealogy of morality is a part of the last creative stage of Nietzsche. It was a book written in prose, its intention was to make a sharp critique of the traditional philosophical theories that have prevailed in morals and beliefs in the Western world. This philosopher develops with energetic style, reflections aimed at dismantling moral prejudices and values that, according to him, represented the crisis of existing philosophical thought. It is an invitation to doubt and questioning of Western morality, starting with questioning the use given to the previous concept of genealogy. It appears in this work a change from the initial inclination for the interpretation of existence from the Greek tragic art towards science and reflection. A transformation from a tragic Pathos to an illustrated Pathos.