(Cristensen, 1989).To date there are few studies which systematically register how many cancer patients experience fatigue, in which stage of the disease process and to what extent. To give an indication, a literature-search using MEDLINE with CD-ROM over the period 1980 to 1991 yielded nine references in which 'fatigue' was included in the title and 'cancer' was included in title, keyword or abstract. Eight of these references pertained to nursing research.An appraisal of the research literature concerning fatigue in cancer is presented in this paper to give an overview of what is currently known. Literature, other than obtained using the MEDLINE-procedure, was gathered either by searching for studies in which fatigue was assessed as part of patient functioning or through references of the papers obtained. This procedure does evidently not lead to an exhaustive list of all the studies which included fatigue as an outcome-variable. However, we think to have obtained a representative sample. Topics that will be discussed are: the conceptualisation of fatigue and its measurement, prevalence rates of fatigue during and after treatment and somatic and psychological correlates of fatigue. Finally, considerations with regard to research and interventions will be discussed.