Traditional healing practices vary enormously in content and share structural features with remarkable consistency.
Those features correspond closely to what research on placebo effects and contextual factors has identified as influencing outcomes. The correspondence is interesting regardless of what one concludes from it.
The recurring features
Across traditions with no contact between them, healing practices tend to involve:
A practitioner with recognised standing. Someone whose authority is acknowledged by the community and by the patient.
A diagnostic act. Some process by which the affliction is identified and named. The naming itself appears significant.
An elaborate procedure. Ritual actions, frequently prolonged, frequently involving specific materials, words and sequence.
An explanatory framework. An account of what has gone wrong that makes sense within the patient's understanding of the world.
Community involvement. Others present, participating, witnessing.
An expectation of improvement, expressed confidently.
Cost or difficulty — payment, effort, or sacrifice on the patient's part.
What placebo research identifies
The correspondence is close enough to be worth listing alongside.
Research on contextual effects in medicine has found that outcomes are influenced by practitioner manner and confidence, by the elaborateness of the procedure, by the perceived cost of the treatment, by the amount of attention received, and by the patient's expectation.
Studies have found that more invasive procedures produce larger placebo effects than less invasive ones, that longer consultations produce better outcomes, and that a confident practitioner produces different results than a hesitant one.
Each of these maps onto a feature of traditional healing practice.
What follows from this
Two readings, and both have something to them.
The deflationary reading. Traditional healing works to the extent that it works through contextual effects, which are real but not specific to any particular practice. The content doesn't matter; the structure does.
This explains why practices with incompatible theories all report success — they're all delivering the same underlying mechanism through different content.
The other reading. Traditional practices discovered empirically, over long periods, how to maximise the effects that clinical research has since identified. That's a genuine achievement rather than a failure.
Modern medicine, in becoming more efficient, has stripped out many of the contextual elements — shorter consultations, less ceremony, less attention, less explanation — and may have discarded something that was doing work.
The limits, stated clearly
Important to be specific about what contextual effects can and cannot do.
Placebo effects are best demonstrated for subjective and centrally mediated symptoms: pain, nausea, fatigue, anxiety, some functional symptoms.
They have not been demonstrated to affect objective disease processes — tumour growth, infection clearance, fracture healing.
Which means a healing practice may genuinely help somebody feel better while not affecting an underlying condition. For a self-limiting illness that distinction may not matter practically. For a serious progressive disease it matters enormously.
The documented harms from traditional healing generally arise from exactly this: delay in accessing effective treatment for conditions where delay is consequential.
What modern practice has lost
Worth stating because the criticism runs in both directions.
Consultation lengths have shortened substantially in most health systems. Research on consultation duration has found associations with patient satisfaction, with prescribing patterns, and with outcomes.
Explanation has been compressed, and evidence suggests that patients frequently leave consultations without understanding what they were told.
Continuity of care has declined, and research has found associations between continuity and outcomes including mortality.
These are not sentimental concerns. They're identifiable features with measurable effects, and they've been reduced for reasons of efficiency without full accounting of what was lost.
The ethical position
Where this leaves practice.
The consensus position is that maximising contextual effects around evidence-based treatment is legitimate and good practice. Clear explanation, adequate time, confidence where warranted, attention.
Deliberately providing treatment with no specific effect, while implying it has one, is not — and open-label placebo research suggests deception may not even be necessary.
For traditional practices specifically, the question is generally not whether they help anybody feel better, which they frequently do, but whether they're being used in place of treatment that would address an underlying condition.
That distinction — complementary alongside, versus alternative instead of — is where nearly all the documented harm sits, and it's the one worth insisting on.
What's genuinely interesting
The convergence itself. That practices developed independently across unconnected societies arrived at similar structural features, and that those features correspond to what controlled research subsequently identified.
That's evidence of something being discovered rather than invented, which is a more interesting conclusion than either dismissal or credulity.
General information only. Any health condition should be assessed by a qualified healthcare professional, and complementary practices should not replace evidence-based treatment.
The practitioner's belief
An element that appears in the anthropological literature and has no clean modern equivalent.
Traditional healers generally believe in what they are doing. That belief is transmitted through manner, confidence and conviction, and it is part of what the patient encounters.
A clinician administering a treatment they consider effective communicates something different from one going through the motions, and research on practitioner expectation suggests this affects outcomes.
Which raises an awkward point for modern practice. The contextual factors that improve outcomes include genuine conviction, and genuine conviction is not something that can be adopted as a technique.
The version available is honest confidence in treatments that work, adequate time, and attention — which is less than a healer's certainty and is achievable without deception.