The WHO defines health as a state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity. This holistic view emphasizes that health encompasses overall quality of life, including emotional and social factors, which are crucial for patient care and recovery. Focusing solely on disease absence or laboratory values neglects these essential dimensions. Understanding this broad definition ensures a comprehensive approach to treatment and public health policies.

Reference: Textbook of Preventive and Social Medicine, Park K, 23rd Edition.