Study objective: To investigate the association between family cancer caregivers’ unmet daily needs and emotional states of depression, anxiety and stress across their care recipient’s treatment phases. Method: A cross-sectional study design and self-report questionnaires were used. Family caregivers (N = 237) of cancer patients in ambulatory cancer clinics were recruited from May to December 2017, and completed a sociodemographic and medical questionnaire, the Depression Anxiety Stress Scale and Needs Assessment of Family Caregivers-Cancer Scale.