When I was a young surgeon, I was fascinated by the remarkable things medicine could accomplish, but I was equally intrigued by the things that happened when we couldn’t fully explain why a patient felt better. Imagine two people participating in a medical study, both suffering from persistent pain, who are given what they believe may be a promising new medication. One receives the actual drug, while the other receives an inactive pill, yet both report feeling some relief.
How could that happen when one of the pills contained no active medicine? For years, physicians tended to dismiss such improvements as being all in the patient’s head, but I have always found that expression rather amusing because, after all, where else would we expect the brain to be? The brain is part of the body, and what happens there can influence what happens elsewhere. The placebo effect reminds us that healing is not simply a mechanical process in which a drug acts upon a passive patient, but an extraordinarily complex interaction involving the brain, the body, our expectations, and the circumstances in which we receive care.
Today, neuroscience is helping us understand some of the biological mechanisms behind this remarkable phenomenon. Researchers have demonstrated that expectations of relief can influence the brain’s pain-processing systems, including pathways involving natural opioid chemicals, while previous experiences, conditioning, and the reassuring rituals surrounding medical treatment can also shape our responses. In certain circumstances, even people who know they are receiving a placebo may experience improvements in symptoms, although these findings are not consistent across every condition.
What fascinates me is that the relationship between physician and patient may be part of this story as well, because a doctor’s confidence, a compassionate explanation, and the feeling of being listened to can influence a patient’s expectations and experience of care. Of course, we must distinguish genuine placebo-related effects from natural recovery and other reasons people improve during studies, and we must remember that placebos cannot be relied upon to eliminate infections, shrink tumors, or reverse serious diseases. But the evidence that expectations can influence symptoms such as pain gives us another reason to appreciate the extraordinary connections between our thoughts, experiences, nervous systems, and physical well-being.
Perhaps the greatest lesson of the placebo effect is not that we should replace medicine with belief, but that we should stop treating the patient’s mind as though it were somehow separate from the rest of the healing process. Throughout my career, I have encouraged physicians to remember that the words they speak, the hope they offer, and the compassion they demonstrate can become meaningful parts of a patient’s experience, just as fear, discouragement, and frightening expectations can sometimes make suffering worse.
I have also encouraged patients to recognize that they are more than passive recipients of treatment, because their relationships, attitudes, questions, and willingness to participate in their care can influence how they experience illness, even when they cannot determine its outcome. To me, the most exciting future for medicine is one in which we combine the extraordinary achievements of medical science with a deeper understanding of the human being receiving that care. Perhaps the real lesson of the placebo effect is that medicine works not only in the body we treat, but also within the person we care for, and the more we understand that partnership, the more humane and effective healing can become.
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