Daniel sent us this one, and I want you to picture it for a second. You wake up, your eyes are streaming, you can't stop sneezing, your nose is a disaster. Classic spring allergies. Now imagine instead of walking into a clinic and getting a prescription for a second-generation antihistamine, you're in the year fifteen hundred. You find the nearest healer. What actually happens to you? And the deeper question underneath that is whether anything recognizable as a doctor even existed back then, or whether we're projecting a modern institution onto a world that had something entirely different going on.
By the way, today's episode is powered by Claude Sonnet four point six.
Which probably has fewer side effects than whatever they were about to prescribe us in fifteen hundred. Okay, Herman, where do we even start with this?
The first thing I want to establish is that the answer to "did doctors exist" is yes, technically, but the word is doing enormous work there. Because what you'd actually encounter, depending on who you were and where you lived, ranged from a university-trained physician who'd read Galen in Latin, to a barber who also happened to pull teeth and let blood, to a woman in the village who knew which plants did what. Those three people were all, in some sense, your healthcare options in fifteen hundred, and they had almost nothing in common with each other except that none of them had any concept of what an allergen is.
That's before we even get to the part where they try to fix it by draining you.
That's coming, yes. The bloodletting is absolutely coming.
I feel like the whole episode is just building toward the bloodletting.
It really is. But let's set the stage properly first, because I think people underestimate how coherent the intellectual framework was. It wasn't chaos. It wasn't random superstition layered on top of other random superstition. There was a system. It just happened to be wrong in almost every particular.
Four humors, blood, phlegm, yellow bile, black bile. Every illness is an imbalance of one or more of those. The system traces back to Hippocrates and Galen, and by fifteen hundred it had been the dominant medical framework in Europe for roughly thirteen hundred years. The University of Salerno, which is often cited as the first formal medical school in Europe, was established in the ninth century, and its curriculum was still essentially Galenic. So you have this unbroken intellectual lineage from ancient Greece through to the early sixteenth century, and it's all built on the same foundational premise: the body has four fluids, health is equilibrium, disease is disruption.
Nobody thought to, I don't know, check whether any of it was true.
Checking in the modern sense requires a concept of controlled experimentation that didn't really crystallize until the seventeenth century. You have to remember that in fifteen hundred, the idea that you would test a medical theory against observed outcomes in a systematic way, with a control group, with documented case notes, was just not part of the epistemological toolkit. You observed, you reasoned from first principles inherited from ancient authorities, and if the patient died, well, either the treatment came too late or the imbalance was too severe to correct.
The framework was unfalsifiable almost by design.
Almost by design, yes. And that's actually one of the things that made it so durable. It could accommodate any outcome. If the patient got better, the treatment worked. If they didn't, the disease was too advanced or the diagnosis of which humor was out of balance was slightly off. The theory itself never took the hit.
That is a remarkably robust system for being completely wrong.
It really is. And this is where your allergy scenario gets interesting, because allergies, seasonal rhinitis, contact dermatitis, the whole category of immune-mediated hypersensitivity reactions, that concept simply did not exist. The first documented allergic condition in the medical literature, what we now recognize as Henoch-Schonlein purpura, wasn't described until eighteen thirty-seven. So there's a gap of over three hundred years between fifteen hundred and anyone even beginning to formalize the idea that the body could mount an excessive response to an environmental trigger.
You walk in sneezing in April and they don't even have a name for what you have.
They don't have a category for it. What they have is a set of symptoms, and they're going to map those symptoms onto the humoral framework. Sneezing, watery eyes, runny nose, that's phlegm. You clearly have an excess of phlegm. You may also have what they'd call a cold and moist constitution, which in the humoral system maps to a particular temperament and a particular vulnerability. The treatment is going to aim at drying you out, warming you up, and restoring balance.
How do you dry someone out in fifteen hundred?
A few ways. Herbal preparations were significant, and some of them were actually doing something. There's a Britannica piece on aromatherapy that traces the use of distilled plant oils, eucalyptus, lavender, back to roughly this period for respiratory conditions. Eucalyptus in particular has genuine decongestant properties. So if your healer gave you eucalyptus oil to inhale, you might have actually felt better, at least temporarily, and not because of any mystical property, just basic pharmacology.
Which they had no idea about.
Which they had no idea about. They thought it was correcting a humoral imbalance. The mechanism they believed in was fictional. The outcome, in that specific case, happened to be real. And that's a distinction worth holding onto, because there's a tendency to either romanticize traditional medicine as secretly wise or dismiss it entirely as primitive nonsense, and the truth is more interesting than either of those. Some things worked. Most things didn't. And the practitioners had no reliable way to tell the difference.
Where does the bloodletting come in for our sneezing patient?
If the healer decided your primary issue was an excess of blood rather than phlegm, or if they decided you needed a more aggressive intervention, bloodletting was on the table. The theory was that removing blood would reduce the overall humoral load and allow the body to rebalance. And this wasn't a fringe practice. This was mainstream. This was what university-trained physicians prescribed. A barber-surgeon would do the actual cutting, typically at a vein in the arm or the neck, and the amount removed could be substantial. We're talking sometimes a pint or more.
Which is, medically speaking, not great.
For someone with seasonal allergies? You'd go in sneezing and come out significantly worse. Bloodletting as a treatment for almost any condition we'd recognize today was at best useless and at worst actively harmful. There's evidence it contributed to the deaths of patients who might otherwise have recovered. George Washington is the famous case, though that's two centuries later, but the practice persisted well past fifteen hundred precisely because the framework that justified it was so entrenched.
If you were poor, you weren't even getting the physician. You were getting the barber.
Right, and this is the class dimension that I think gets underplayed. A university-trained physician in fifteen hundred was expensive, rare, and mostly confined to cities. The vast majority of people, particularly rural populations, were relying on local healers, often women, who practiced what you might call empirical folk medicine. They knew from generational experience that certain plants helped with certain symptoms. Some of that knowledge was genuinely useful. Some of it was layered with religious ritual and magical thinking. And then there were monasteries, which in some areas were the primary healthcare institutions, where monks maintained herb gardens and treated the sick as an act of Christian charity.
The monastery was the hospital.
In many cases, yes. And the monk-healer was operating from a slightly different framework than the university physician, because the religious interpretation of illness ran parallel to the humoral one. Disease could be divine punishment. It could be spiritual affliction. The appropriate response might be prayer, pilgrimage, contact with a holy relic. These weren't seen as alternatives to medical treatment so much as complementary dimensions of the same problem. You're sick because your body is out of balance and possibly because God is displeased with you, and both of those things need addressing.
Which adds a certain psychological weight to having a runny nose in April.
It really does. Imagine going to your healer and they tell you your phlegm is excessive, they're going to bleed you, and also you should consider whether you've been sufficiently pious lately.
I'd convert immediately. Whatever denomination promises the fewest leeches.
The leeches, actually, were sometimes the gentler option compared to a lancet. And then there's the third possibility for your allergy symptoms, which is that they'd be interpreted not as a physical imbalance or a spiritual failing, but as the result of bad air. The idea that disease was transmitted through corrupt or putrid air, and that environmental factors like proximity to swamps or rotting matter were causing your illness. If you had a seasonal pattern to your symptoms, a healer might well conclude that the air in spring was particularly corrupt in your location.
Which is actually kind of close to the right answer in a very wrong way.
There is an environmental trigger. The air is involved. But instead of pollen particles binding to IgE antibodies on mast cells and triggering histamine release, they've got miasma. The causal chain they've constructed is completely wrong, but the observation that something in the spring air is making you sick is, by accident, pointing in roughly the right direction.
Close enough to seem plausible, not close enough to actually help you.
Which is kind of the story of medicine for most of human history. And I think that's exactly why this hypothetical is worth taking seriously, not just as a joke about how bad things used to be, but as a way of understanding what it actually took to get from there to here. The gap between miasma theory and germ theory isn't just a gap in knowledge. It's a gap in the entire methodology of how you generate and test knowledge about the body. And that transition, when it happened, was one of the most consequential things in the history of our species.
We went from bleeding you for your sneezes to a twelve-milligram cetirizine tablet.
In about four hundred years, which in the timescale of human medicine is extraordinarily fast.
Still feels like it could have been faster.
It always does. But the machinery that had to be built first, clinical trials, germ theory, immunology, the discovery of histamine in nineteen ten, the development of the first antihistamines in the nineteen forties, each of those steps required the previous one. You can't synthesize an antihistamine if you don't know histamine exists. You can't identify histamine if you don't have the biochemical tools to isolate compounds. You can't build those tools if you haven't gone through the scientific revolution first. It's a deeply path-dependent process.
Meanwhile, in fifteen hundred, someone's bleeding you.
Telling you to avoid cold foods, because cold foods increase phlegm, and suggesting you burn some aromatic herbs in your room, and maybe recommending a pilgrimage if things don't improve.
I mean, the pilgrimage sounds nice actually. Get some fresh air, walk it off.
The exercise might have helped. Moving to a different environment, getting away from whatever was triggering you. There's something there, even if the reasoning behind it was entirely wrong.
Okay, so you walk into this consultation—you're a person of means who can afford the university physician. What does that room look like, and what exactly would he do to you? And just to set the stage, what did it even mean to be a "doctor" at this time?
The word "doctor" in fifteen hundred was already in use, but it meant something much more specific and rarer than today. A doctor, formally, was someone who held a doctorate from a university—men who'd spent years studying Galen, Avicenna, and Hippocrates at places like Padua, Bologna, or Paris. Mostly reading, very little hands-on anatomy. The University of Salerno, Europe's first serious medical school dating back to the ninth century, had been absorbed into the broader university tradition by then, but its intellectual legacy was everywhere. The curriculum was built on ancient Greek and Roman texts, reinterpreted through Arabic scholarship, taught in Latin.
The cutting edge of medicine in fifteen hundred was roughly a thousand years old.
And these physicians, when you finally got in front of one, were not going to touch you. That's an important thing to understand. The university physician diagnosed and prescribed. He examined your urine, sometimes your pulse, asked about your diet and your dreams and your emotional state. Physical examination as we understand it was quite limited. The actual procedures, the bloodletting, the lancing of abscesses, anything involving a blade, that was beneath his station. That was the barber-surgeon's domain.
The barber-surgeon. Which is a job title that should not exist.
Yet it makes complete sense given the guild structure of the time. Barbers already owned sharp instruments and had steady hands. Surgeons were considered tradesmen, not scholars. So you had this formal hierarchy where the physician was the learned man who told you what was wrong, and the barber-surgeon was the craftsman who actually cut you. They had separate guilds in England until fifteen forty, when Henry VIII merged them into the Company of Barber-Surgeons.
Then below both of them you had the apothecary.
Right, the apothecary was essentially the pharmacist and sometimes the de facto general practitioner for people who couldn't afford a physician. He compounded herbal preparations, sold remedies, and often gave advice well beyond his formal scope. If you had allergy symptoms and you went to the apothecary, you'd probably walk out with something containing nettle, or possibly a preparation with some aromatic component. Nettle, interestingly, does have some evidence behind it for allergic rhinitis. There's a active compound there. So again, occasionally useful, for entirely the wrong stated reasons.
Illness itself, how was a person in fifteen hundred actually thinking about why they were sick? Not the physician's framework, just the ordinary person.
The ordinary person in fifteen hundred was navigating at least three overlapping explanations simultaneously and saw no contradiction between them. There's the humoral one, which had filtered down into popular understanding, so people knew about hot and cold constitutions, about phlegm and bile. There's the religious one, which we touched on, illness as divine communication. And there's what you might call the magical or astrological one, because the physician himself was consulting astrological charts to determine the best time for treatment. The position of the planets affected the humors. Bleeding a patient under the wrong zodiac sign was considered dangerous.
Your allergy diagnosis might have depended partly on what month it was.
It absolutely would have. Spring onset of symptoms, that's Aries season, that has astrological significance, that affects which humor is likely dominant, that shapes the treatment recommendation. The whole system was interlocked in a way that made it feel coherent and comprehensive even though it was built on foundations that had nothing to do with how the body actually works.
Which means the calendar was doing diagnostic work.
And the physician wasn't being irrational by his own epistemological standards. He had a complete, internally consistent system. Galen had built it, Avicenna had refined it, the universities had transmitted it. Every piece connected. The humors responded to seasons, seasons corresponded to astrological periods, the stars influenced terrestrial matter, terrestrial matter included the human body. It was elegant in the way that wrong theories sometimes are.
The problem with an elegant wrong theory is that it's very hard to dislodge.
That's exactly the problem. And humoral theory had roughly two thousand years of institutional momentum behind it by fifteen hundred. Hippocrates articulated the framework around four hundred BCE. Galen systematized it in the second century. And then it got transmitted through Islamic scholarship, through Avicenna's Canon of Medicine in particular, which was still a standard university text in fifteen hundred, still being taught, still being cited. You're dealing with a theory that had survived the fall of Rome, the medieval period, the rise of universities, all of it. That's not a theory you overturn with a few anomalous cases.
You need a whole different way of asking questions.
You need a methodology, not just better observations. And that's what was missing. The observations were there. Physicians in fifteen hundred were seeing things that didn't fit the humoral model. But without a framework for controlled experimentation, without the concept of falsifiability, the anomalies just got absorbed. If a patient didn't respond to bloodletting, the explanation was that you hadn't bled them enough, or at the wrong time, or from the wrong vein. The theory was always protected from its own failures.
Let's take melancholy, because that's actually a good case study in how the system worked in practice. Someone comes in profoundly depressed by our understanding. What does the physician see?
He sees an excess of black bile. That's the humoral explanation for melancholy, it's right there in the word itself, melas khole, Greek for black bile. The patient is cold and dry, those are the qualities associated with black bile, and the treatment aims to counteract those qualities. You want to introduce warmth and moisture. So the physician might prescribe wine, certain warming foods, gentle exercise. He might recommend avoiding cold and damp environments. He might prescribe herbal preparations, borage was commonly used, saffron was considered warming and mood-lifting. There's actually a reasonable case that some of these had mild psychoactive or anti-inflammatory properties.
If none of that worked?
Then you consider purging to expel the excess bile. Or bloodletting, though bloodletting for melancholy was somewhat contested because blood was associated with warmth and removing it risked making the cold condition worse. There were genuine debates within the humoral framework about this. Physicians disagreed about which vein, how much, at what stage of the illness. It had the texture of a scientific debate without any of the underlying rigor.
It sounds like the debates were real even if the premises were completely wrong.
The debates were absolutely real. And that's important to understand because it means these weren't stupid people. They were smart people reasoning carefully within a broken framework. The gap wasn't intelligence. The gap was empirical methodology. Nobody was running a trial where you bleed half the melancholic patients and leave the other half alone and see what happens. The concept didn't exist.
For our allergy sufferer, the black bile question is interesting, because allergy symptoms don't obviously map to cold and dry. You've got runny nose, watering eyes, sneezing. That's very phlegmatic.
That's exactly how they'd read it. Excess phlegm, cold and wet in quality. The treatment logic runs in the opposite direction from melancholy. You want to dry and warm the system. So you're getting dietary advice to avoid cold and wet foods, cucumbers, melons, cold water. You're getting warming herbs, possibly ginger, possibly something aromatic to inhale. And if the physician is concerned the phlegm is truly excessive, you're getting some form of purgation or bloodletting to reduce the overall humoral load.
The bloodletting is doing a lot of heavy lifting in this system.
It was the default intervention for almost everything, because reducing the quantity of any humor was always available as a treatment option regardless of which humor was implicated. Too much blood, bleed. Too much phlegm, bleed and also purge. Too much yellow bile, purge primarily but bleed if severe. Too much black bile, purge and maybe bleed cautiously. The barber-surgeon with his lancet was essentially the system's universal reset button.
A reset button that occasionally killed people.
Bloodletting contributed to patient deaths with some regularity, particularly in cases of fever where the patient was already volume-depleted, or in cases where the instruments weren't clean, which they weren't, ever, because the germ theory of disease didn't exist and there was no concept of sterile technique. The barber-surgeon wiped his lancet on his apron between patients. That's the standard of care.
I want to go back to something you said about the aromatic herbs, because the research on this is actually interesting. By fifteen hundred, distilled plant oils were in use. Eucalyptus, lavender, things that were being inhaled or applied for respiratory conditions. And some of those have genuine pharmacological activity.
Some of them do. Eucalyptol, which is the active compound in eucalyptus oil, has real anti-inflammatory and mild bronchodilatory properties. If you're inhaling eucalyptus steam for a congested nose, you are getting some actual physiological effect. Not enough to treat a significant allergic response, but not nothing either. And nettle, which the apothecary would likely have in stock, contains compounds that inhibit several inflammatory pathways involved in allergic reactions. The efficacy is modest and the evidence is not strong by modern standards, but it's there.
The apothecary accidentally had the closest thing to a real allergy treatment.
Which is a pattern across folk medicine generally. The closer a remedy is to direct symptom relief using plant compounds, the more likely it is to have some actual effect. It's the remedies built on pure theory, the bloodletting, the dietary restrictions based on humoral qualities, the astrological timing, where you get zero or negative benefit. The empirical folk knowledge accumulated over generations sometimes hit on something real by trial and error, even without understanding the mechanism.
The person receiving the care couldn't tell the difference, because both things were being presented as part of the same coherent system.
You can't isolate which part of the treatment is helping when everything is happening simultaneously and the theoretical framework explains all outcomes in advance. If you get better, the treatment worked. If you don't get better, the disease was too advanced, or the treatment needed adjusting, or God's will was operating beyond the physician's reach. The framework was unfalsifiable by design, not by malice, just by the absence of any other way of thinking about it.
Which is honestly a little bit terrifying when you sit with it.
It took a long time to build the tools to think differently—and that's the real story underneath all of this. But Corn, I keep wondering about the societal architecture around it.
That societal architecture is what I keep coming back to. Because who exactly is the person you're even going to see? We've touched on this, but it's worth being precise about the hierarchy, because it was strange by our standards.
It was a three-tier system and the tiers barely communicated with each other. At the top you have the university-trained physician. He holds a doctorate, he has read Galen and Avicenna, he diagnoses and prescribes but he does not touch you. Touching the patient was beneath his station. Below him you have the barber-surgeon, who does the physical procedures, the bloodletting, the wound dressing, the tooth extraction, the minor amputations. And then you have the apothecary, who compounds and sells remedies. These three groups had overlapping and contested jurisdictions and they were frequently in conflict with each other over who was allowed to do what.
The person with the most education was the one least likely to actually put his hands on you.
And for most people in fifteen hundred, the university physician was not accessible anyway. He was expensive, he was urban, he was serving wealthy households and the nobility. If you were a rural peasant with a streaming nose and itchy eyes every spring, you were going to a local healer, probably a woman with herbal knowledge passed down through generations, or a monk at a nearby monastery, or you were just managing at home.
The monastery piece is interesting because that's organized medical knowledge in an institutional setting.
Monastic medicine was substantial. The Benedictine tradition in particular had a strong culture of caring for the sick, and monasteries maintained herb gardens specifically for medicinal purposes. They were copying and preserving ancient medical texts. There's a real argument that the monasteries were the primary repositories of whatever practical medical knowledge survived from antiquity into the medieval period. By fifteen hundred the universities had taken over the theoretical side, but the monastic tradition of hands-on herbal care was still very much operating.
Sitting over all of this is the Church, which has opinions about illness and healing that aren't entirely separable from the medical ones.
The Church's position was complicated and it shifted over time, but by fifteen hundred you have a settled framework where illness is understood as potentially spiritual in origin, potentially a test, potentially a punishment, and healing is understood as operating on both physical and spiritual dimensions simultaneously. Physicians were expected to recommend confession before treatment. There's a papal decree from twelve hundred and fifteen, the Fourth Lateran Council, that actually required physicians to call a priest before proceeding with serious cases, because if the patient died unshriven that was a problem of a different magnitude than the medical one.
The first consultation was with God, effectively.
Or at least with God's representative. And this wasn't experienced as a conflict with the medical framework, it was integrated into it. The humors were part of God's created order. The physician was working within that order. A successful cure was evidence of divine favor as much as medical skill. An unsuccessful cure was not evidence that the physician was wrong, it was evidence that God had other plans.
Which is a bulletproof professional liability shield.
And it points to something real about why the system persisted. It wasn't just intellectual inertia. It was institutionally protected on multiple fronts simultaneously. The universities certified it. The Church sanctified it. The social hierarchy depended on it. The physician who questioned Galen wasn't just being heterodox medically, he was potentially being heterodox in ways that touched on religious and political authority.
The Black Death is the stress test for all of this, isn't it. Because that's the moment where the system gets confronted with something it cannot explain or manage.
The Black Death is the most dramatic falsification event that humoral theory survived, which tells you something about how resilient these frameworks are. Between roughly thirteen forty-seven and thirteen fifty-one, somewhere between a third and half of Europe's population died. The physicians had no explanation that worked and no treatment that helped. The humoral explanations were offered, miasma, bad air, planetary conjunctions, a conjunction of Saturn, Jupiter and Mars in twelve forty-five degrees of Aquarius was actually cited by the Paris medical faculty in thirteen forty-eight as a contributing cause. But none of the interventions did anything.
Yet humoral theory came out of it intact.
Largely intact, yes. What the Black Death did do was accelerate certain practical changes. It pushed forward the idea of quarantine, which is an empirical response even if the theoretical justification was miasma rather than contagion. It created enormous demand for medical care that the existing physician hierarchy couldn't meet, which expanded the roles of barber-surgeons and apothecaries. And it produced a generation of practitioners who had seen so much death that some of them were more willing to experiment. But the theoretical framework itself absorbed the catastrophe and continued.
Because if the framework can survive a fifty percent mortality event, it can survive pretty much anything short of a complete epistemological revolution.
Which is eventually what happened, but not for another century and a half. Vesalius publishes his anatomy in fifteen forty-three, Harvey describes circulation in sixteen twenty-eight, and even then the humoral framework doesn't collapse immediately. It retreats slowly, reluctantly, over decades.
Our allergy sufferer in fifteen hundred is walking into a system that has not just survived but has been reinforced by the worst medical catastrophe in European history.
The practitioners they're seeing are not failed scientists. They're competent operators within a coherent system that happens to be built on wrong foundations. The physician who examines you, checks your urine, assesses your pulse, asks about your diet and your sleep and your emotional state, recommends dietary adjustments and a warming herbal preparation from the apothecary, and maybe sends you to the barber-surgeon for a modest bleed if the symptoms are severe, that physician is doing his job correctly by every standard available to him. The tragedy isn't incompetence. It's the absence of the tools that would have told him he was wrong.
And that’s why the real horror isn’t the bloodletting or the astrology charts. It’s that you could receive conscientious care from a learned person and still be worse off than if you’d stayed home and drunk some nettle tea.
Yet here's what I keep coming back to when I think about this historically. The nettle tea is still in the health food store. You can buy stinging nettle capsules marketed for seasonal allergies. The apothecary's shelf and the supplement aisle have more overlap than most people are comfortable admitting.
That's the persistence piece, isn't it. Some of what survived from fifteen hundred into folk medicine and then into the wellness industry actually has a pharmacological basis, and some of it is pure humoral logic wearing a different outfit.
The distinction matters enormously and it's often not made clearly. Nettle has real, if modest, anti-inflammatory activity. Elderberry has compounds with some genuine immunological relevance. But a lot of what's sold alongside those things is essentially the warming and drying logic of humoral theory translated into modern marketing language. Detox, cleanse, restore balance. The vocabulary changed. The underlying model didn't.
The practical takeaway for listeners is: when you see the word "balance" on a supplement label, ask yourself which century that word is coming from.
That's actually a good heuristic. The framing of illness as imbalance to be corrected through additions or subtractions to the body is pre-scientific thinking. It's not automatically wrong, some things do involve restoring a disrupted equilibrium, but it's a flag that you're in territory where the claims need scrutiny.
The other thing I take from all of this is how much the structural separation matters. The fact that we now have one person who examines you, understands the mechanism of what's wrong, can perform or refer for procedures, and can prescribe a treatment with a known pharmacological profile, that integration is not obvious. It was assembled over centuries out of three competing guilds who didn't trust each other.
The coordination problem in medicine took longer to solve than the biological problems in some ways. The germ theory of disease, the understanding of immune response, those are nineteenth and twentieth century achievements. But the basic idea that the person who diagnoses you should also understand what the treatment is actually doing, that's a structural achievement that required dismantling a lot of entrenched professional hierarchy.
We benefit from it every time someone hands us a cetirizine tablet and says, here, this is a second-generation H1 receptor antagonist, it blocks the histamine response that's making your eyes water, take it once a day.
Which would have been an incomprehensible sentence to every physician in fifteen hundred. Not just the terminology, the entire causal chain. The idea that your sneezing is a specific biological response to a specific environmental trigger, mediated by a specific molecule, addressable by a specific molecular intervention. That conceptual architecture simply did not exist.
The gap between cetirizine and nettle tea is not just pharmaceutical. It's epistemological.
That's the thing I'd want listeners to carry out of this episode. The distance we've traveled is not primarily a distance in technology. It's a distance in how we think about what an explanation is. A good explanation in fifteen hundred was one that fit within the humoral framework and the religious framework and satisfied the social expectations of the physician's role. A good explanation now is one that makes a specific, falsifiable, mechanistic claim about cause and effect. That shift is the real achievement.
It took about four hundred years of people being wrong in increasingly productive ways.
Wrong in ways that generated better questions. That’s probably the most generous description of scientific progress we’ve got.
Here we are, four hundred years later, just a few centuries into this better-questions era. Which makes me wonder: what are we getting wrong right now that’ll seem just as obvious to people in twenty-three hundred?
That question keeps me up at night,. My best guess is it's somewhere in the neighborhood of the microbiome. We have this vast, complex ecosystem inside us that we're only beginning to characterize, and I think we're probably making interventions, dietary, pharmaceutical, that have second and third-order effects we can't see yet because we don't have the conceptual tools to look for them. That feels like our humoral blind spot.
The physician in fifteen hundred couldn't imagine the histamine receptor. We probably can't imagine whatever the relevant mechanism is that we're currently missing.
Which is humbling. And it's an argument for a certain epistemic modesty about current practice that I think medicine sometimes resists, for understandable institutional reasons.
The understandable institutional reasons being, roughly, that if you tell patients you might be wrong in ways you can't currently detect, they go buy nettle capsules.
There's a real tension there. But I think the honest version of modern medicine is one that says: here is the best mechanistic explanation we have, here is the evidence behind the intervention, and here is the confidence level. That's different from what the physician in fifteen hundred was offering, even if it's still imperfect.
That feels like the right place to land. Conscientious care, wrong foundations, better questions over time, and a certain humility about what we're currently missing. Thanks to Hilbert Flumingtop for producing this one. Modal keeps our infrastructure running and we appreciate it. This has been My Weird Prompts. If you've been enjoying the show, a review wherever you listen goes a long way. We'll see you next time.
