In clinical trials for irritable bowel syndrome, about 30% of patients taking a placebo report noticeable improvement in their symptoms.
See the scientific wording
A 30% response rate is the baseline level of improvement observed in placebo-controlled trials for conditions like irritable bowel syndrome.
Very strong evidence
Randomized trialsOne good-quality study supports this claim.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2022
This study found that even when people knew they were taking a fake pill, many still felt better — just like when they didn’t know it was fake. This supports the idea that about 30% of IBS patients improve with a placebo, even without real medicine.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
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When a person expects relief from a treatment, even if it's fake, their brain sends signals that calm the nerves in the gut, which reduces the feeling of pain and discomfort.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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