“…30,38,47,49,51 Eleven studies highlighted an association between fatigue and physical symptoms, including poor sleep, 35,37,57,61,74,75 being part of a symptom cluster, 33,70,73 and nausea. 29,61 Almost all participants in the three studies that examined symptom clusters were receiving chemotherapy; 33,70,73 although there was no consistency in the specific symptoms found to cluster with fatigue, the symptoms tended to be chemotherapy-related. While receiving chemotherapy 23,36,44,47,60,66 or dexamethasone 45 both correlated with increasing fatigue, the evidence for a correlation between fatigue and hospital admission 47,60,72 or anemia 46,60 was conflicting.…”