Within Anecdotes
Did it work, or did time pass?
A real improvement after a remedy can still be coincidence unless the cause is tested against what would have happened anyway.
On this page
- Why after does not prove because
- Colds, placebo effects and ordinary recovery
- What comparison groups change about the story
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Introduction
A recovery story can be completely genuine and still lead to a false conclusion. Someone develops symptoms, tries a remedy, and then improves. The sequence is real. The mistake is assuming that because the recovery happened after the remedy, the remedy must have caused it.
This timing trap is one of the most common ways people overgeneralise from personal experience. Human memory naturally focuses on the dramatic before-and-after story: “I took it on Tuesday and by Thursday I was better.” What is usually missing is the comparison that would answer the crucial question: what would have happened if nothing had been taken? Without that comparison, ordinary recovery, symptom fluctuations and placebo effects can easily be mistaken for proof that a treatment worked. Research in medicine and statistics has repeatedly shown that improvement after an intervention is not, by itself, reliable evidence that the intervention caused the improvement. [PMC]pmc.ncbi.nlm.nih.govPMCby K Meissner · 2007 · Cited by 124 — The results suggest that placebo interventions can improve physical disease processes of periphe… [NCBI]ncbi.nlm.nih.govNCBIPlacebo EffectStatPearls - NCBI Bookshelfby S Munnangi · 2023 · Cited by 52 — The placebo effect is a fascinating phenomenon that occurs when a sham me…
Why after does not prove because
The underlying mistake is often called a post hoc error: assuming that because one event followed another, the first event caused the second.
In health and recovery stories, the problem is especially persuasive because illnesses unfold over time. Most people seek help when symptoms are at their worst or most worrying. If improvement follows, it is tempting to credit whatever was tried immediately beforehand.
Yet several different processes can produce the same apparent success story:
- The illness may have been about to improve anyway.
- Symptoms may naturally fluctuate from day to day.
- Expectations and belief may alter how symptoms are experienced.
- The intervention may genuinely help.
Looking only at one person’s timeline cannot reliably separate these possibilities. The story contains a sequence of events, but not the missing alternative timeline showing what would have happened without the treatment. That missing comparison is the key piece of evidence. [primrmed.com]primrmed.comthe critical role of placebos in clinical research7 Feb 2025 — By including a placebo group, researchers can better understand the safety and side effects of the active treatment compared…
The hidden role of symptom peaks
A particularly important mechanism is regression to the mean. People often try a remedy when symptoms become unusually severe. Extreme states tend to be followed by less extreme states simply because fluctuations rarely continue in the same direction indefinitely.
This can create the illusion that an intervention caused improvement. Researchers have long warned that regression to the mean can make ineffective treatments appear successful when people are measured at their worst point and then observed later. In healthcare, this phenomenon can mislead both patients and professionals into attributing recovery to a treatment when some of the apparent benefit is actually the natural movement of symptoms back towards a more typical level. [PMC]pmc.ncbi.nlm.nih.govPMCby K Meissner · 2007 · Cited by 124 — The results suggest that placebo interventions can improve physical disease processes of periphe… [White Rose Research Online]eprints.whiterose.ac.ukWhite Rose Research OnlineEffect of regression to the mean on decision making in…by V Morton · 2003 · Cited by 404 — When monitoring o…
Colds, placebo effects and ordinary recovery
The common cold provides a classic example of the timing trap.
Most colds improve on their own. Symptoms typically peak and then decline as the immune system clears the infection. If someone starts a herbal remedy, vitamin supplement or home treatment near the peak of symptoms, improvement over the following days may occur regardless of whether the remedy had any meaningful effect.
From the individual’s perspective, the story feels convincing:
- I felt terrible.
- I took the remedy.
- I got better.
The missing observation is that many people who do not take the remedy would also have improved during the same period.
Placebo effects add another layer of complexity. Placebo effects are not simply imaginary recoveries. Expectations, reassurance, therapeutic rituals and attention can influence how symptoms are perceived and reported, particularly for experiences such as pain, nausea, fatigue and wellbeing. A person may therefore feel genuinely better after a treatment even when the treatment’s specific active ingredient is not responsible for the change. [NCBI]ncbi.nlm.nih.govNCBIPlacebo EffectStatPearls - NCBI Bookshelfby S Munnangi · 2023 · Cited by 52 — The placebo effect is a fascinating phenomenon that occurs when a sham me… [PMC]pmc.ncbi.nlm.nih.govPMCby K Meissner · 2007 · Cited by 124 — The results suggest that placebo interventions can improve physical disease processes of periphe…
This means a sincere testimonial can accurately describe an improvement while still misidentifying its cause. The person’s experience is real; the explanation may not be.
Why memorable recoveries spread myths
Recovery stories are often more persuasive than statistics because they are vivid, emotional and easy to remember. A striking personal account can create the impression of certainty even when the underlying evidence is weak.
The problem becomes larger when many people share similar stories. If a condition commonly improves on its own, thousands of people may independently experience recovery after using the same remedy. The accumulation of testimonials can appear impressive, yet it may still reflect the ordinary course of the illness rather than a genuine treatment effect.
This is why large collections of anecdotes are not automatically equivalent to controlled evidence. They may simply repeat the same timing error many times.
What comparison groups change about the story
The reason medical researchers use control groups is not because personal experiences are worthless. It is because personal experiences alone cannot reveal what would have happened otherwise.
A comparison group provides that missing reference point.
Imagine two groups of people with similar symptoms:
- One group receives the treatment.
- The other does not, or receives a placebo.
If both groups improve by roughly the same amount, the recovery is likely to be largely explained by time, natural healing, placebo responses or symptom fluctuations. If the treatment group improves substantially more, there is stronger evidence that the treatment itself contributed to the outcome. [primrmed.com]primrmed.comthe critical role of placebos in clinical research7 Feb 2025 — By including a placebo group, researchers can better understand the safety and side effects of the active treatment compared…
This comparison changes the story from a sequence of events into a test of causation.
Without a comparison group, a treatment can look effective merely because people tend to seek it when they are feeling especially bad. With a comparison group, researchers can estimate how much improvement would have happened anyway and how much, if any, is attributable to the intervention. Randomised controlled trials were developed largely to solve exactly this problem. [primrmed.com]primrmed.comthe critical role of placebos in clinical research7 Feb 2025 — By including a placebo group, researchers can better understand the safety and side effects of the active treatment compared…
The practical lesson
A recovery that follows a remedy is evidence that two things occurred in sequence. It is not, by itself, evidence that one caused the other.
The timing trap persists because human memory naturally records the dramatic before-and-after narrative while ignoring the invisible alternative outcome. Colds resolve, symptoms fluctuate, people often seek treatment at their worst moments, and placebo effects can produce genuine perceived improvement. All of these can create convincing recovery stories even when the treatment itself contributes little or nothing. [PMC]pmc.ncbi.nlm.nih.govPMCby K Meissner · 2007 · Cited by 124 — The results suggest that placebo interventions can improve physical disease processes of periphe… [NCBI]ncbi.nlm.nih.govNCBIPlacebo EffectStatPearls - NCBI Bookshelfby S Munnangi · 2023 · Cited by 52 — The placebo effect is a fascinating phenomenon that occurs when a sham me…
The key question is therefore not simply, “Did I get better after taking it?” but “Did I get better more than I would have if I had not taken it?” That missing comparison is what separates a memorable story from evidence of cause. [primrmed.com]primrmed.comthe critical role of placebos in clinical research7 Feb 2025 — By including a placebo group, researchers can better understand the safety and side effects of the active treatment compared…
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Further Reading
Books and field guides related to Did it work, or did time pass?. Use these as the next step if you want deeper reading beyond the article.
Bad Science
Uses health claims, placebo effects and flawed evidence examples directly related to the topic.
Thinking, Fast and Slow
Covers cognitive biases that lead people to overinterpret personal experiences.
How to Lie with Statistics
Introduces common reasoning errors around evidence and conclusions.
The Drunkard's Walk
First published 2008. Subjects: Probabilities, Chance, Random variables, Mathematics, Nonfiction.
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Endnotes
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC1125994/Source snippet
Some women continue to lose bone at the first follow up measurement...Read more...
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Source: ncbi.nlm.nih.gov
Title: NCBIPlacebo Effect
Link: https://www.ncbi.nlm.nih.gov/books/NBK513296/Source snippet
StatPearls - NCBI Bookshelfby S Munnangi · 2023 · Cited by 52 — The placebo effect is a fascinating phenomenon that occurs when a sham me...
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Source: primrmed.com
Title: the critical role of placebos in clinical research
Link: https://www.primrmed.com/cancer-education/the-critical-role-of-placebos-in-clinical-researchSource snippet
7 Feb 2025 — By including a placebo group, researchers can better understand the safety and side effects of the active treatment compared...
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC1847831/Source snippet
PMCby K Meissner · 2007 · Cited by 124 — The results suggest that placebo interventions can improve physical disease processes of periphe...
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Source: eprints.whiterose.ac.uk
Link: https://eprints.whiterose.ac.uk/id/eprint/42/1/1083.pdfSource snippet
White Rose Research OnlineEffect of regression to the mean on decision making in...by V Morton · 2003 · Cited by 404 — When monitoring o...
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Source: scribbr.co.uk
Title: Scribbr Regression to the Mean | Definition & Examples
Link: https://www.scribbr.co.uk/bias-in-research/regression-to-mean/Source snippet
Regression to the Mean | Definition & Examples - Scribbr16 Oct 2022 — Regression to the mean is observed when variables that are extremel...
Additional References
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Source: science.gov
Link: https://www.science.gov/topicpages/p/placebo-controlled%2Btrial%2BcomparingSource snippet
placebo-controlled trial comparingThe goal of this study was to examine in a prospective, randomized controlled trial whether patient exp...
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Source: postoffice.co.uk
Link: https://www.postoffice.co.uk/branch-finderSource snippet
Branch FinderUse the Post Office Branch Finder tool to find our where your nearest branch is and what services are available at your loca...
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Source: brookbushinstitute.com
Link: https://brookbushinstitute.com/glossary/regression-to-the-meanSource snippet
Regression to the meanRegression to the mean is a statistical tendency; natural recovery is a biological process; placebo effect is a psy...
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Source: pfizer.com
Link: https://www.pfizer.com/news/articles/how_the_placebo_effect_can_cloud_clinical_trial_resultsSource snippet
How the Placebo Effect Can Cloud Clinical Trial ResultsThe mere act of going to a doctor or a clinic can cause a placebo effect, even whe...
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Source: merriam-webster.com
Link: https://www.merriam-webster.com/dictionary/post -
Source: instagram.com
Link: https://www.instagram.com/ukpostoffice/?hl=enSource snippet
Post Office (@ukpostoffice) • Instagram photos and videosChoose from our range of guaranteed services for those extra special presents, a...
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Source: GOV.UK
Link: https://www.gov.uk/government/organisations/post-officeSource snippet
OfficeThe Post Office provides mail, financial and government services to the public through its nationwide network of post office branch...
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Source: cochrane.org
Link: https://www.cochrane.org/evidence/MR000055_do-treatment-effects-randomised-trials-differ-when-using-active-placebo-compared-standard-placeboSource snippet
1. We found no clear difference in effect between active and standard placebos, but we are very uncertain about the results.Read more...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=8pFd8DLcPIYSource snippet
Journey of a LetterFilm exploring the journey of a letter from post box to recipient. Discover the surprising story of the first social n...
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Source: royalmail.com
Link: https://www.royalmail.com/
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