Objective: To understand the existential transformations of the family caregiver of a person living with Amyotrophic Lateral Sclerosis. Method: Qualitative study based on assumptions of Martin Heidegger Existential Phenomenology, with 12 family caregivers of the person with Amyotrophic Lateral Sclerosis, in Alagoas. The testimonies were obtained from June 2019 to March 2020 and analyzed, categorized, and discussed based on the theoretical-philosophical framework adopted and thematic literature.