Absence of disease is only part of the picture. Health is a state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity, as defined by the World Health Organization.

Physical health includes fitness, nutrition, and freedom from illness. Mental health encompasses emotional resilience and cognitive function. Social well-being involves relationships, safety, and the ability to participate in community life. Determinants range from genetics and behavior to environment, education, and economic conditions.

Promoting health requires action beyond clinics: clean water, education, fair work, and supportive policies. Clinicians contribute by preventing disease, treating illness, and helping patients maintain function. Measuring health at population level guides public investment and reveals inequities that need redress.

• Complete physical, mental, and social well-being
• More than the simple absence of disease
• Shaped by biology, behavior, and social conditions
• Promoted by both clinical care and public policy