Placebo Effects on Pain Treatment and Research - Placebo效应在疼痛治疗与研究中的重要性

Aug 23, 2026

Placebo effects meaningfully shape patient outcomes across pain care and clinical studies, with substantial variation in response rates and durations across conditions. The literature review examines magnitude and timing, including time-effect curves and peak, cumulative, and carryover patterns resembling active medications. It also explains clinical improvement through natural history and regression to the mean, specific treatment content effects, and nonspecific factors such as expectations, learning, clinician attention, and treatment context. Without independently evaluated randomized controlled trials, true causes of pain improvement remain unclear.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Objective

Data Sources

Study Selection

Results

Placebo response rates and time effects

Surgery-related placebo effects and variability

Explanatory models

Conclusions

Key Questions in Pain Treatments

Reasons for Clinical Improvement

Natural history and regression to the mean

Specific effects of treatment

Nonspecific effects of treatment

Implications for Clinicians and Investigators

Methods

Literature search strategy

Placebo and Discredited Procedures in Outcome Comparisons

# The Importance of Placebo Effectsin Pain Treatment and Research Judith A.Turner,PhD;Richard A.Deyo,MD,MPH;John D.Loeser,MD;Michael Von Korff,ScD;Wilbert E.Fordyce,PhD Objective.—To estimate the importance and implications of placebo effects inpain treatment and researchfrom the existing literature,with emphasison theirmag-nitude and duration,the conditions influencing them,and proposed explanations. Data Sources.—English-language articles and books identified through MED-LINE(1980 through 1993)and PsycLIT(1967 through 1993)database searching,bibliography review,and expert consultation. Study Selection.—Articles were included if they pertained to the review objec-tives. Results.—Placebo response rates vary greatly and are frequently much higherthan the often-cited one third.Placebos have time-effect curves,and peak,cumu-lative,and carryover effects similar to those of active medications.As with medi-cation,surgery can produce substantial placebo effects,and this possibility is com-monly overlooked in case series reports on back surgery.Individuals are notconsistent in theirplacebo responses,and aplacebo-responder personality has notbeen identified.Models advanced to explain placebo effects emphasize the role ofanxiety,expectations,and learning. Conclusions.—Placebo effects influence patient outcomes after any treatment,including surgery,that the clinician and patient believe is effective.Placebo effectsplus disease natural history and regression to the mean can result in high rates ofgood outcomes,which may be misattributed to specific treatment effects.The truecauses of improvements in pain after treatment remain unknown in the absence ofindependently evaluated randomized controlled trials. (JAMA.1994;271:1609-1614) TWO questions are of major interest toclinicians and researchers with respectto pain treatments:What is the efficacyof a specific treatment(under what con- ditions and for what patients will it im-prove certain dimensions of outcome),and why do patients improve with it(what is the mechanism)?There arethree general reasons for clinical im-provement in a patient's condition. 1.Natural history and regression tothe mean.Most acute and some chronicpain problems resolve on their own ir-respective oftreatment.Many individu-als have recurrent episodes of pain suchas headache or low back pain,inter-spersed with no or minimal pain.Pa-tients with chronic conditions typicallyhave fluctuating symptoms and seekmedical care(andenroll in research stud-ies)when symptoms are at their worst.Thus,the next change is likely to be an Reprint requests to the Department of Psychiatryand Behavioral Sciences RP-10,School of Medicine,University of Washington,Seatle,WA 98195(DrTurner). improvement.Thistendency ofextremesymptoms or findings to return towardthe individual's more typical state isknown as regression to the mean.²Ap-parent improvement may also reflectmeasurementerrororrandom variationin patient symptoms over time.² 2.Specific effects of treatment,at-tributable to the characteristic contentof the intervention. 3.Nonspecific effects of treatment,attributable to factors other than spe-cific active components.These includephysician attention,interest,and con-cern in a healing setting;patient andphysician expectations of treatment ef-fects;the reputation,expense,and im-pressiveness of the treatment;and char-acteristies of the setting that influencepatients to report improvement.Theterm placebo effect is often used syn-onymously with nonspecific effects. It is helpful for clinicians to know thecontributions of each of these processesto treatment effects in order to make op-timal treatment decisions.It is also es-sential for investigators to understandthe extent to which placebo effects canaccount for improvements observed inclinical studies.The purpose of this ar-ticle isto review the literature on placeboeffects,with an emphasis on their mag-nitude and duration,the conditions influ-encing them,proposed exp

FAQs

Why do placebo effects matter in pain treatment and research?

Placebo effects influence patient outcomes after any treatment when clinicians and patients believe it is effective. They can contribute to high rates of good outcomes that may be misattributed to specific treatment effects.

What factors explain improvement in patients with pain?

The article outlines three broad reasons: natural history and regression to the mean, specific effects of treatment tied to its content, and nonspecific effects from factors like attention, expectations, learning, and treatment context.

What does the review say about the role of surgery in placebo effects?

Surgery can produce substantial placebo effects, and this possibility is often overlooked in case series reports. Placebo responses and natural history can account for substantial portions of observed improvements.

Aug 23, 2026

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