This document discusses concepts of health and disease from various perspectives. It defines health as a state of complete physical, mental, and social well-being according to the WHO. Health has physical, mental, and social dimensions. The determinants of health include heredity, environment, health services, and human behavior and lifestyle. Disease is defined as a physiological or psychological dysfunction and includes an individual's perceptions and responses. The natural history of a disease over time is also examined, from susceptibility to clinical symptoms to resolution or termination with potential sequels.