Oral mucositis is a common and distressing complication experienced by patients undergoing cancer treatment, particularly chemotherapy and radiation therapy. It manifests as infl ammation and ulceration of the oral mucosa, leading to pain, discomfort, and impaired oral function. Th e signifi cant impact of oral mucositis on patients’ quality of life and treatment outcomes necessitates a comprehensive understanding of its prevention, management, and nursing care. Th is scientifi c book delves into the multifaceted aspects of oral mucositis, focusing specifi cally on the role of nursing care in its prevention and treatment. By examining the current evidence-based practices and guidelines, the article aims to shed light on the crucial responsibilities of nurses in addressing oral mucositis and enhancing patient well-being during cancer treatment.Th e book highlights the importance of early oral assessment, the development of personalized care plans, and the implementation of evidence-based interventions to minimize the occurrence and severity of oral mucositis. Furthermore, it emphasizes the need for a multidisciplinary approach, fostering collaboration among healthcare professionals to provide holistic, patient-centered care.Th is book aims to contribute to the growing body of knowledge in oral mucositis and nursing care by disseminating the latest research fi ndings and evidence-based recommendations. Th is comprehensive exploration will empower nurses to enhance their skills, knowledge, and practices, ultimately leading to improved outcomes and enhanced quality of life for patients with oral mucositis.76 PrefaceWe extend our gratitude to the researchers, healthcare professionals, and patients whose dedication and contributions have paved the way for advancements in understanding and managing oral mucositis. Their unwavering commitment to improving patient care serves as a driving force behind this scientific endeavor.May this book serve as a valuable resource for healthcare professionals, researchers, and policymakers, promoting evidence-based nursing care and ultimately alleviating the burden of oral mucositis for patients undergoing cancer treatment.We would like to express our sincere gratitude to all the individuals who have contributed to the creation and publication of this book on oral mucositis and nursing care. It is through your collective efforts and dedication that we have been able to compile and share valuable insights on this critical topic.Lastly, I would like to express my heartfelt thanks to Dr. Gülnihal DENİZ, our esteemed instructor, who played a crucial role in inspiring us to write this book, and to Research Assistant Şeyda KARASU, who contributed during the writing process. I extend my deepest love and gratitude to my dear spouse, who always supported me throughout this journey, and to my beloved daughters.31/05/2023Asst. Prof. Dr. Yasemin ERDENErzurum Technical UniversityFaculty of Health Sciences Department of NursingResearch Assist. Seyda KARASUErzurum Technical UniversityFaculty of Health Sciences Department of Nursing