INTRODUCTIONAdvances in healthcare have led to a growing number of people living with chronic illnesses. At the same time, the proportion of older adults in the population is also growing, further increasing the number of those with chronic health problems because of accumulated exposure to chronic illness risk factors over their lifetime [1,2].Hospitalization rates due to chronic illnesses such as heart failure, stroke, chronic obstructive pulmonary disease, cancer, hypertension, and diabetes are highest among individuals aged 65 and over and typically result from an acute change in the health status of older adults [3]. Older adults with multiple chronic conditions that require close follow-up and early discharge may be prone to an increased risk of re-hospitalization because the decline of cognitive function or physical disabilities [1,3]. Furthermore, when appropriate care or resources are not available in the community, older patients will often remain in high-level care such as intensive care, exacerbating wait times for others in need of a hospital bed [1,3]. Therefore, comprehensive and wellexecuted discharge plans including the acceptance of changes in functional capacity, reconciliation of medications ordered at admission and at hospital discharge, coordination of follow-up diagnostic tests and appointments, and assessment of community Transition theory is widely used in the field of nursing because nursing frequently involve various transitions (e.g., mothering, immigration, health and illness, etc.) and it has been welcomed and adopted in nursing research, education, and practice [10,11].Transition theory provides an excellent lens through which nursing can be systematically and comprehensively viewed [12,13].Also, transition theory is particularly applicable for the care of aging families because age-related transitions that may result in hospitalization of an older adult often precipitate the need for nursing care for older individuals [11]. Furthermore, transition theory informs nurses on how to better understand the experience of transitioning from a hospital-to-home or nursing home, and how nurses can develop multifaceted interventions to ease the transition process for older adults [13]. However, more studies are needed to review the utility of applying transition theory to transitional care for older adults with chronic illnesses.Nurses play a key role in transitional care as they advocate for older patients with chronic illnesses and their families and provide direct care on a continual basis [14][15][16]. To stimulate discussion on the transitional care literature, an extensive review of the literature on transitional care in nursing for older adults with chronic illnesses is presented in this article. In addition, the usefulness and significance of Meleis' transition theory is critically compared with other conceptual models suggested for chronic care. How to improve transitional care in nursing areas is also discussed.