['The majority of new mothers in Sweden initiate breastfeeding and many experience initial difficulties. This experience is an important cause of early breastfeeding cessation. To increase understanding, there is a need to explore the lived experiences of the decision to continue or cease breastfeeding. The aim of this study is therefore to explain and understand how this decision is influenced by the meaning of severe initial difficulties.', 'A lifeworld hermeneutical approach was used for the study. The study was conducted in Sweden with eight mothers who experienced severe difficulties with initial breastfeeding. All except one were interviewed on two different occasions resulting in fifteen interviews. The interviews were conducted between 2010 and 2013.', 'Mothers who experience severe difficulties with initial breastfeeding feel both overtaken and violated not only by their own infants and their own bodies but also by their anger, expectations, loneliness and care from health professionals. These feelings of being overtaken and invaded provoke an existential crisis and place mothers at a turning point in which these feelings are compared and put in relation to one another in the negotiation of the decision to continue or cease breastfeeding. This decision thus depends on the possibility of feeling secure with the breastfeeding relationship. If insecurity dominates, this can, in severe cases, create a feeling of fear of breastfeeding that is so great that there is no alternative but to stop breastfeeding.'] Is existential security a necessary condition for continued breastfeeding despite severe initial difficulties : a lifeworld hermeneutical study?