espanolLas nauseas y el vomito son sintomas desagradables frecuentes en el paciente pediatrico con quimioterapia, a menudo tratados con medicamentos antiemeticos, para prevenir o disminuir este efecto incapacitante, sin embargo, estos sintomas pueden ser abordados con la Teoria de los Sintomas Desagradables, valorando factores fisicos, psi-cologicos, situacionales que facilite la planeacion e intervencion efectiva del cuidado de enfermeria en el manejo del paciente oncologico. La interrelacion teoria-practica, permite usar la valoracion de enfermeria en los pacientes pediatricos con diagnostico oncologico disponiendo de la propuesta teorica de los sintomas desagradables para justificar el cuidado en postulados de teoricas de en-fermeria con las necesidades reales de los ninos. EnglishNausea and vomiting are unpleasant sensations that generate discouragement and helplessness in the child and caregivers. The nurse who provides care must be able to integrate knowledge into practice, in order to reduce these unpleasant symptoms in the biological, psychological and social sphere. Objective: to present the relationship with the theory of unpleasant symptoms in the planning of care in nausea and vomiting in pedia-tric patients with an oncological diagnosis undergoing chemotherapy treatment. Metho-dology: literature search on nausea and vomiting as an unpleasant symptom in pediatric patients with cancer diagnosis. the databases were: Scielo, Lilacs, ProQuest, PubMed, wi-thout a time limit, in English, Spanish and Portuguese, and the terms: unpleasant symp-toms, nausea and vomiting, oncology, pediatric oncology. Results: Nausea and vomiting are frequent unpleasant symptoms in pediatric patients with chemotherapy, often treated with antiemetic drugs, to prevent or reduce this disabling effect, however, these symp-toms can be addressed with the Theory of Unpleasant Symptoms, evaluating physical, psychological and situational factors that facilitate the planning and effective intervention of nursing care in the management of cancer patients. Conclusion: The theory-practice interrelation allows the use of the nursing evaluation in pediatric patients with available oncological diagnosis of the theoretical proposal of unpleasant symptoms to justify the care in theoretical nursing postulates with the real needs of children