BackgroundNutritional care is a basic human right for all people. Nevertheless, undernourishment is known to be a frequent and serious health care problem among elderly hospitalized patients in Western Europe. Nutritional documentation contributes to ensuring proper nutritional treatment and care. Only a few studies have explored how nurses document nutritional care in hospitals, and between hospitals and nursing homes. Available research suggests that documentation practices are unsatisfactory. The aim of this study was to explore how nurses document nutritional treatment and care for elderly patients in hospitals and how nurses and undergraduate nurses communicate information about patients’ nutritional status when elderly patients are transferred between hospital and nursing homes.MethodsA qualitative study was conducted using a phenomenological-hermeneutic approach. Data was collected in focus group interviews with 16 nurses in one large university hospital, and 11 nurses and 16 undergraduate nurses in five nursing homes associated with the university hospital. Participants from the university hospital represented a total of seven surgical and medical wards, all of which transferred patients to the associated nursing homes. The catchment area of the hospital and the nursing homes represented approximately 10% of the Norwegian population in heterogenic urban and rural municipalities. Data were coded and analysed thematically within the three contexts: self-understanding, critical common sense, and theoretical understanding.ResultsThe results were summarized under three main themes 1) inadequate documentation of nutritional status on hospital admission, 2) inadequate and unsystematic documentation of nutritional information during hospital stay, 3) limited communication of nutritional information between hospital and nursing homes. The three main themes included seven sub-themes, which reflected the lack of nutritional screening and unsystematic documentation on admission and during hospital stay. Further the sub-themes elucidated poor exchange of information between hospital and nursing homes regarding the nutritional status of patients.ConclusionOverall, the documentation of nutritional treatment and care for elderly patients was inadequate in the hospital and between health care settings. Inappropriate documentation can create a negative nutritional spiral that leads to increased risk of severe health related complications for elderly patients. Moreover, it hinders nutritional follow-up across health care settings.Electronic supplementary materialThe online version of this article (doi:10.1186/s12912-016-0193-z) contains supplementary material, which is available to authorized users.