Objective: to analyze the experiences of pleasure and suffering of nursing workers in COVID-19 hospital units. Methods: a multicenter, qualitative study, developed with 35 nursing workers from COVID-19 units in seven hospitals in southern Brazil. Data were produced through semi-structured interviews, submitted to thematic content analysis with the help of NVivo. Results: experiences of pleasure were linked to gratification, identification with work content, positive results in care, recognition, integration with the team and personal overcoming. Suffering was revealed in daily life of deaths and losses, feelings of helplessness, team conflicts, institutional demands, professional devaluation. Workers reported disenchantment, but also strengthening the meaning of their work, highlighting frontline impacts on their mental health. Final considerations: in the dynamics between pleasure and suffering in nursing work in COVID-19 hospital units, elements point to the risk of psychological illness.