This literature review examines the concept of smart home healthcare systems for monitoring the health of elderly patients suffering from dementia, drawing upon five journal papers. It explores various aspects of health monitoring systems, including the technologies used, such as environmental sensors, personal sensor networks, and body sensor networks, and their application in managing conditions like fall detection and memory loss. The review also delves into the importance of human factors in mental health care, particularly in community-based programs for older adults with depression and dementia, highlighting the Aging Brain Care Model and its components. Additionally, it investigates cloud-based smart home environments for delivering home healthcare, focusing on activity recognition and health problem detection. The studies included discuss the benefits, limitations, and future work related to these systems, including the need for improved computational power, data sharing practices, and personalized care approaches.