The paper is the result of research on the impact of the humanitarian emergency of COVID-19 on pre-existing forms of psychological suffering - in particular, psychosis. In this sense, the aim of the article is to discuss the impact of the pandemic on psychosis based on the concept of triggering and the hypothesis that the pandemic works, in these clinical situations, as a triggering situation. A discussion of bibliographical references on the triggering of psychosis in contexts of humanitarian/health emergencies is presented. These references narrow the research down to the biological impact and brain damage caused by viruses. Within the framework of these references, the article locates the relevance of the psychoanalytic concept of triggering in the light of the clinical-conceptual elaboration of foreclosure to elucidate the vulnerability of psychotic subjects to situations of humanitarian/sanitary emergencies.