Symptom management knowledge is a priority for pediatric oncology nursing research. Theories and models can frame the studies of symptoms experienced during childhood cancer. This article describes and analyzes the middle-range theory, theory of unpleasant symptoms (TOUS), for its conceptual and empirical fit with pediatric oncology nursing based on its current use in adult oncology research and its limited use to date in pediatric oncology. Searches in PubMed and CINAHL databases using the keywords theory of unpleasant symptoms and cancer and covering the time period 2000 to 2017 yielded 103 abstracts for review. Twenty published reports met eligibility criteria for review; only one included pediatric oncology patients. No study to date has tested all the components of the TOUS in pediatrics. The TOUS component of performance appears to be underaddressed across completed studies that instead include a focus on patient-reported quality of life rather than on perceived behavioral or performance indicators concurrent with the subjective symptom reports. Additionally, the influence of family, essential in pediatric oncology, is absent in the majority of studies guided by the TOUS. The TOUS is a structurally complicated framework that would be a conceptual fit for pediatric oncology if family influence and perceived function were included. Studies across this population and guided by the TOUS are needed, although testing all the theorized linkages in the TOUS would likely require a large sample size of patients and, thereby, multisite approaches given that cancer is a rare disease in childhood.
Theory of unpleasant symptoms: support for the management of symptoms in children and adolescents with cancer