Purpose The aim of this study was to explore the symptom experience and self-management strategies of adult hematopoietic stem cell transplantation patients during hospitalization. Methods This was a qualitative descriptive study. A heterogeneous sample of 19 patients who underwent hematopoietic stem cell transplantation from May to October 2021 were enrolled in the study. Semi-structured interviews were conducted at four time points during hospitalization, providing a total of 64 interview datasets. Results Four themes and 11 subthemes reflecting the symptom experience and self-management strategies of adult hematopoietic stem cell transplantation patients during hospitalization were observed. The four themes were (1) unexpected symptom burden: dynamic, disturbing, co-occurring, and correlative; (2) emotional complexity at different periods; (3) internal predicament: ineffectiveness of symptom management; and (4) external strength: desire for support from multiple sources. Hematopoietic stem cell transplantation patients experienced a complex and dynamic array of symptoms from admission to discharge, and they experienced the dual forces of internal predicament and external strength in symptom selfmanagement during hospitalization. ConclusionThe findings of this study emphasize the need for a deeper understanding and precise management of the symptom experience of adult hematopoietic stem cell transplantation patients during hospitalization. Hematopoietic stem cell transplantation nurses need to assess symptoms on an ongoing basis; educate patients on ways to perceive, express, and self-manage multiple symptoms; and develop patients' self-symptom management skills to enhance their symptom relief and quality of life.