Malnutrition is a commonly existing problem at Swedish hospitals and nursing homes. Despite this there is a lack of national guidelines for assessment of and interventions during malnutrition. The aim of this study was to investigate in which way nutritional status can be assessed on an old multipical ill patient in a hospital or at a nursing home. And what nursing interventions the nursing staff can make to improve patients’ nutritional status. The chosen method was a literature review which was based on twelve scientific articles. The result shows that a combination of anthropometic measurements, biochemical markers and an assessment tool is required for an adequate estimation of nutritional status. Nursing interventions that could be used by the nursing staff are individually adjusted meal support, in between meal snacks, oral feeding support and dietary records. Further knowledge and research is required to reach national guidelines for nutritional assessment.