A miner climbs out of the shaft at the end of a long shift and something in him is off. Not injured, not infected — just wrong. Heavy. The old Chinese physicians had a prescription for this man, written more than a thousand years ago: lie in the sun. Not a herb, not a needle. Light. They had noticed that men who spend their days underground get sick in a way that the sun cures, and they wrote it down as medicine.1 That prescription only makes sense inside a particular map of why people get ill — a map old enough to predate it by a thousand years more, set out in two Buddhist suttas that list not three or four but eight separate roads to sickness.2
In the Anguttara Nikaya 4 and the Sivaka Sutra 36:21a, the suffering that produces illness is said to have eight main causes: bile, phlegm, a mixture of both, irregular or imbalanced lifestyle, imbalanced weather, injury, and karma.2 That is the whole list. Dukes flags it as a deliberate departure — the Buddhist healers did not simply clone the Hindu Vedic system. They had a different set of references to build from, the Sutras, and they developed techniques distinct to themselves.3
Read the list once and you notice what it refuses to do. It does not collapse everything into humoral imbalance, the way a strict three-dosha scheme would. Bile, phlegm, and the mix of both account for three of the eight — the internal chemistry. But then the list walks straight out of the body. Lifestyle. Weather. Injury. Karma. Four of the eight causes are not in the patient at all; they are in the patient's relationship to the world, to time, to accident, and to deep history. The map is wider than the skin.
Dukes stresses what the ordering is for. These categories reflect the Buddhist doctor's primary concern: relieving suffering, and relieving its cause. And he adds one strange, load-bearing line — in cases of spiritual sickness, this order was reversed.4 The list reads one way for a body and the opposite way for a soul. Karma, last on the list for a sick stomach, comes first for a sick spirit.
Walk the four external causes and you see a single principle: the body is porous. It is not a sealed engine that breaks down on its own; it is an open system constantly traded into by its surroundings.
Take "imbalanced weather," the category Dukes spends the most ink on. It is the one a modern reader is most tempted to laugh off, and it is the one he defends hardest. The European word temperament, he points out, found in several old European language roots, means "weather."5 The connection is not metaphor — it is etymology. The medieval mind, East and West, classed your inner temper as a kind of internal climate, and it classed your moods as weather inside you. When we say someone is "stormy" or has a "sunny" disposition, we are speaking a medical language a thousand years old without knowing it.
And the link runs both directions: outer weather changes the inner weather. Dukes points to the French, who attribute certain mental imbalances to the mistral — the cold, dry wind that pours down the Rhône valley — and who acknowledge it in their common law.6 A crime committed while the mistral blows is, in some readings of that tradition, a crime with a meteorological co-defendant. The wind is on the docket. This is "imbalanced weather" as a cause of illness, surviving in the legal code of a modern European state.
The category also covers the seasons, and here Dukes reaches for his strongest modern witness: G.G. Luce, the pioneering American researcher who produced data indicating that fundamental disorders — heart disease, epilepsy, metabolic problems — track the body's response to light, in both natural and artificial forms.7 When she first announced this, many disbelieved her. Then the science had to think again. Seasonal light, seasonal sickness: the ancient "imbalanced weather" category and the modern study of circadian and seasonal biology are pointing at the same thing from two thousand years apart. Which brings us back to the miner. China, over a thousand years ago, prescribed remedial sunbathing as a medicine, particularly for those working predominantly in darkness or underground.1 They had no word for vitamin D or for seasonal affective disorder. They had the category "imbalanced weather," and it was enough to get the man into the sun.
This page gives the rest of the Dukes medical corpus its diagnostic backbone. Three Body Languages in Buddhist Medicine describes how the body signals distress; the eight causes describe where the distress originates, and the two together let a healer trace a symptom to a source. Buddhist Healing Mandate sets out the monk-doctor's obligation; this list is the differential diagnosis that obligation runs on. The "weather" category hands Somatypes as Constitutional Diagnosis a missing axis — constitution is not only the body you were born with but the climate you are steeped in. And the karma category routes straight to Karma and Samskaras: when illness is karmic, the cause lies in a memory the body is carrying from before this life, and the diagnostic list quietly opens onto the whole architecture of consciousness.
Take Dukes's single most provocative claim and turn it over: the French attribute certain mental imbalances to the mistral and acknowledge this in their common law.6 What is actually being asserted here?
A legal system is a society's settled account of responsibility — who did what, and how much they can be blamed for it. To let the wind into the courtroom is to say that a person is not the sole author of their own state. The mistral is a co-cause. Some fraction of the imbalance belongs to the climate, not the defendant. Dukes uses this as evidence that "oriental medieval peoples recognized far more subtle influences upon our health balance than is done nowadays" — and that the West once recognized them too, deep enough to fossilize the recognition in law.5
Now watch the move he is making. He takes a category that sounds like superstition — illness caused by weather — and shows it surviving in two of the most hard-headed institutions a culture owns: its law and its medical research. The mistral in French law on one side; G.G. Luce's light-and-disease data on the other. The "primitive" category is bracketed by a courtroom and a laboratory, and both of them are confirming it. That is the whole rhetorical engine of this passage: the eight causes are not a relic to be explained away but a wide-angle lens that modern narrow medicine is slowly, grudgingly, refitting itself with.
A late autumn afternoon, the clinic window grey. The patient in front of you is tired in a way no test will name — sleeping badly, low, heavy-limbed, nothing broken and nothing infected. The narrow reflex is to reach for the three internal causes: is it bile, is it phlegm, is it the mix? You check. Nothing decisive. So you let your attention walk outward along the list. Lifestyle — you ask what their days look like now, and learn they took a job that starts before dawn and ends after dark, indoors under fluorescent tubes. Weather — you notice it is the third week the sun has not properly come out, and you notice the season turning. You stop hunting inside the body. The cause is not in the patient; it is in the patient's standing relationship to light. You do not prescribe a drug. You prescribe the thing the old Chinese physicians prescribed the miner: get into the sun, real sun, every day it shows. You are reading the same chart they read — the one where "imbalanced weather" is a diagnosis you can write down.
The source is Dukes's exposition of the Anguttara Nikaya 4 and Sivaka Sutra 36:21a, braided with his own commentary and three modern corroborations — the temperament=weather etymology, French mistral common law, and G.G. Luce's light research.2567 The scriptural list itself is firmly attested; the modern gloss is Dukes's framing. [PLAUSIBLE — needs corroboration] on the specific claim that French common law formally acknowledges the mistral as a mitigating cause — the tradition is real and often cited, but Dukes gives no statute, and the legend may be folklore hardened into "law." [PLAUSIBLE — needs corroboration] on the G.G. Luce attribution as Dukes states it; the seasonal-light-and-disease research is real, but the sweeping list of disorders (heart disease, epilepsy) is his paraphrase.
One internal tension worth preserving: the list runs one direction for the body and the reverse for the spirit, but Dukes never specifies how a healer decides which kind of sickness they are looking at. The whole diagnostic act hinges on that prior judgment, and the text leaves it implicit.
Open: the eight causes sit oddly against the three-cause scheme of the Atharva Veda (wind, dryness, water) that Dukes describes elsewhere — see The Atharva Veda's Two Healing Paths. Is the Buddhist eight a deliberate expansion of an older three, or an independent classification? Dukes asserts the Buddhist system is "not a simple clone" of the Vedic one but does not trace the line between them.3
Dukes is reading a canonical Pali list as live clinical instruction, and that is the move a critical historian would flag. Geoffrey Samuel's method in this vault would not dispute that the suttas contain the list; it would ask whether the eightfold etiology was ever practiced as Dukes implies, or whether he is retrofitting a modern integrative-medicine sensibility onto two scripture references. The convergence is real, though: Samuel and Dukes both insist that Indian and Buddhist medicine were genuinely sophisticated systems, not folk superstition awaiting Western correction. Where they part is warrant. Samuel would want the practice independently attested; Dukes's confidence flows partly from his own temple's living tradition and from his readiness to let G.G. Luce and the mistral vouch for the ancients. The reader who trusts the modern corroborations finds the eightfold list vindicated; the reader who wants the practice documented, not just the text, is left with a list and an argument, not a proven clinical history.
Somatic Symptom and Stress Response — modern psychosomatic medicine has spent a century rebuilding, piece by piece, the claim this list made in one breath: that lifestyle and environment are not the context of illness but among its causes. The eight-cause map and the stress-response literature are pointing at the same territory from opposite eras, and putting them side by side exposes what each lacks. The psychology page supplies mechanism — the HPA axis, cortisol, the documented pathways by which a chaotic life or a sunless season becomes a sick body. The Buddhist list supplies something the mechanism literature keeps losing: a single flat taxonomy in which "your job's hours" and "this season's light" sit on the same list as bile and injury, with equal diagnostic standing. The insight neither produces alone: psychosomatic medicine treats environmental causes as a special, softer category that has to argue its way back into legitimacy each time; the eightfold list never demoted them in the first place, which means it never has to re-prove that a dark winter can make you ill — that is just cause number five.
Environmental Design as Influence — the behavioral-mechanics tradition engineers behavior by engineering surroundings: change the room and you change the person in it. The eight causes give that practice a medical underwriting. If "imbalanced weather" and "imbalanced lifestyle" are genuine causes of suffering, then arranging someone's light, hours, and climate is not mere nudging — it is preventative medicine, or its dark twin. The handshake produces a sharp ethical reading: the same lever that lets a healer prescribe sunlight to a miner lets a designer dim the lights to keep a worker compliant and slightly unwell. Neither domain sees this alone. The medical list knows light is a cause but frames every intervention as care; the influence literature knows environment shapes people but frames it as persuasion, not health. Read together, they reveal that environmental control is always simultaneously a medical act and a power move — and that the line between prescribing the sun and withholding it is thinner than either field admits.
Sharpest implication: half of what makes you ill is not inside you — and a medical map that lists weather, season, and the shape of your days as literal causes will catch sicknesses that a body-sealed map files under "stress" and shrugs at.
Generative questions: