Hippocrates even nowadays, represents worldwide an extra-ordinary standard; he is the modest and prudent physician for all sick people. He was a pioneer in his era, and he had already foreseen the basic principles of World Health Organization (WHO) concerning "Health- Hygeia". He tried a lot to set free the medical thought of his era, from the prejudices that dominated all over ancient world. Priests and other "practical doctors" obliged medicine to stay inactive for a long period. But when Hippocrates wrote all his famous books, concerning almost all the known diseases and conditions, that created awareness among the people of the ancient period, hence medicine became more "scientific" and humanistic. Finally, Hippocrates put the right bases and developed the proper methodology in order to diagnose and treat most of the prevalent diseases.