The purpose of this critical commentary is to define, explain and illustrate three systems of belief and oppression that are generally not well known in the health field, but that are likely to have a negative influence on the practices of health and social service professionals as well as those of public or private health organizations, namely: ableism, sanism and suicidism. It also aims to identify certain courses of action that could help combat these systems, which are widespread in the institutions and organizations of our contemporary Western societies.