Several influential figures across history have promoted a holistic approach to medicine, but the tradition traces back most directly to Hippocrates in ancient Greece. From there, a long line of physicians, nurses, philosophers, and researchers built on the idea that healing requires treating the whole person, not just isolated symptoms. Here are the key figures and movements that shaped holistic medicine into what it is today.
Hippocrates and Ancient Greek Medicine
Hippocrates, often called the father of Western medicine, practiced in the 4th and 5th centuries BCE and is widely regarded as the earliest champion of holistic healing. His core philosophy centered on the idea of “a healthy mind in a healthy body,” and he treated patients by looking at the full picture of their lives rather than focusing on a single complaint. The Hippocratic tradition emphasized environmental causes of disease, the therapeutic importance of psychological factors, nutrition and lifestyle, and the need for harmony between the individual and both the social and natural environment.
His approach to care fell into three broad categories: health promotion (including physical activity and nutrition), trauma care, and mental health interventions. Remarkably, Hippocrates proposed the first classification of mental disorders and used music and drama as tools for treating illness and improving behavior. The Asclepieion of Kos, where he practiced, operated as what researchers describe as a holistic health care model, applying ethical standards that remain relevant in medicine today.
Jan Smuts and the Word “Holism”
The actual word “holism” didn’t exist until 1926, when South African statesman and philosopher Jan Christian Smuts published Holism and Evolution. Smuts defined holism as “the ultimate principle of the universe,” describing it as the driving force behind the evolution of “wholes,” from molecules to human beings. His goal was to challenge the mechanical, reductionist view of matter as something passive and inert, replacing it with a dynamic concept in which living systems are more than the sum of their parts. While Smuts was a political figure rather than a physician, his framework gave the holistic health movement its foundational vocabulary.
Florence Nightingale’s Environmental Theory
Florence Nightingale, the founder of modern nursing, was one of the earliest healthcare professionals to formalize a holistic approach to patient care. In her 1860 text Notes on Nursing, the first volume to codify nursing practice, she defined good nursing as “the proper use of fresh air, light, warmth, cleanliness, quiet, and the proper selection and administration of diet, all at the least expense of vital power to the patient.” Rather than seeing the nurse’s role as simply carrying out a doctor’s orders, Nightingale treated the patient’s entire environment as part of the healing process. Her environmental theory laid the groundwork for what would eventually become the holistic nursing movement.
Andrew Taylor Still and Osteopathic Medicine
In the late 1800s, American physician Andrew Taylor Still founded osteopathic medicine on explicitly holistic principles. Still rejected the idea that the body could be understood as a collection of separate systems. He built his practice around four central tenets: that a person is the product of dynamic interaction between body, mind, and spirit; that this interaction gives the individual an inherent capacity to maintain health and recover from disease; that both internal and external forces can challenge that capacity; and that the musculoskeletal system plays a significant role in the body’s ability to resist illness. These tenets remain the philosophical foundation of osteopathic medicine, which today produces fully licensed physicians (DOs) who practice alongside MDs in every medical specialty.
George Engel’s Biopsychosocial Model
For much of the 20th century, mainstream Western medicine operated on a strictly biomedical model: find the broken part, fix it. In 1977, psychiatrist George Engel challenged this framework with what he called the biopsychosocial model. Engel argued that to truly understand and respond to a patient’s suffering, clinicians must attend simultaneously to the biological, psychological, and social dimensions of illness. Disease, he proposed, results from the interaction of factors at the molecular, individual, and social levels, not from any single cause acting in isolation.
Engel’s model was a turning point for academic medicine. It gave physicians and researchers a structured way to think about what holistic practitioners had long argued: that you can’t separate a person’s physical health from their mental state and social circumstances. The biopsychosocial model is now taught in medical schools worldwide and underpins fields like family medicine, psychiatry, and pain management.
Andrew Weil and Integrative Medicine
Andrew Weil, a Harvard-trained physician, became the most visible advocate for holistic principles in modern American medicine starting in the 1990s. He founded the Andrew Weil Center for Integrative Medicine at the University of Arizona, which trains physicians to combine conventional medical practices with complementary strategies. Weil’s framework is deliberate about its boundaries: integrative medicine neither dismisses conventional treatment nor uncritically accepts alternative therapies. It relies on science and evidence, prioritizes prevention, and considers all factors that influence health, including mind, spirit, community, and body.
Weil’s central critique of conventional medicine is that while it is “undoubtedly crucial and beneficial,” it can also be costly, invasive, and overly focused on symptoms rather than the whole person. His stated aspiration is that the word “integrative” will eventually become unnecessary, and that whole-person healthcare with a focus on evidence-based, natural, and less invasive interventions will simply be recognized as good medicine.
The WHO’s Holistic Definition of Health
Perhaps the most influential institutional endorsement of holistic thinking came in 1948, when the World Health Organization wrote its constitution. The WHO defined health as “a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.” That single sentence, still in effect today, formally rejected the idea that health is just the absence of something wrong. It established, at the highest level of global health governance, that well-being is multidimensional, encompassing the same mind-body-environment connections that Hippocrates had emphasized 2,400 years earlier.
Bernie Siegel and the Psychology of Healing
Surgeon Bernie Siegel brought holistic ideas into cancer care in the 1980s through his work with what he called “exceptional cancer patients.” Siegel emphasized that healing comes from within and that a patient’s own beliefs are the most important factor in their treatment. He urged physicians to understand what a diagnosis means to each individual patient, whether that’s fear of death, fear of pain, or fear of the unknown, and to form genuine partnerships with them rather than dictating treatment from a position of authority. His work helped popularize the idea that psychological and emotional factors play a measurable role in physical health outcomes, particularly in serious illness.
The holistic approach to medicine was never the invention of a single person. It is a tradition that stretches from Hippocrates through Nightingale, Still, Engel, and Weil, each building on the same core insight: that the human body cannot be meaningfully separated from the mind that inhabits it or the environment that surrounds it.