Background: The caregiving experience has been extensively investigated in some chronic/severe mental illnesses such as schizophrenia. These studies have suggested that illness variables and situational/personal characteristics of caregivers have a significant influence on how caregivers cope with mental illness. However, other similar conditions, e. g. bipolar affective disorder (BPAD), have been relatively neglected in this regard. This study attempted to compare caregiver-coping in BPAD and schizophrenia and to explore the determinants of such coping.