Health and medicine encompass physical, mental, and social well-being, not just the absence of disease. This unit explores key concepts like epidemiology, morbidity, and mortality, as well as social determinants of health such as income, education, and environment. The unit delves into healthcare systems, health disparities, and cultural perspectives on illness. It also covers public health, disease prevention, and current issues like the COVID-19 pandemic, opioid epidemic, and climate change's impact on health.