What This Concept Is About
The classical entry for "病因" (causes of illness) consists of only a single sentence, but what supports it is the entire Buddhist framework for locating "the suffering of illness."
First, establish the position: In the *Ekottarāgama* (增壹阿含經), the *Madhyamāgama* (中阿含經), and other texts, suffering is divided into four sufferings or eight sufferings — birth, old age, illness, death, plus meeting what is hated, separation from what is loved, failure to obtain what is sought, and the blazing of the five aggregates. The suffering of illness is not an accidental mishap of life; it is a necessary member in the arising of suffering. This point is crucial: from the very beginning, Buddhism refuses to treat illness as "something that should not have happened" — it is a normal projection of dependent origination (pratītyasamutpāda), not an arrangement or punishment by some creator.
"Cause" (因, hetu) and "condition" (緣, pratyaya) must be distinguished: In Abhidharma and Yogācāra analysis, "cause" (hetu) and "condition" (pratyaya) are not the same thing. Cause is the dominant internal factor; condition is the assisting external condition. For example, a seed (cause) needs sunlight, water, and soil (conditions) to grow. The causes of illness must be distinguished in the same way — to blame all illness on a single cause is to read dependent origination as fatalism.
The most classic and complete comprehensive framework of Buddhist etiology comes from Tiantai Zhiyi (天台智顗).
In *Móhē Zhǐguān* (摩訶止觀, *The Great Calming and Contemplation*), scroll 8 (also in the more accessible *Tóngméng Zhǐguān* 童蒙止觀 / *Xiūxí Zhǐguān Zuòchán Fǎyào* 修習止觀坐禪法要, chapter 9, "Treating Illness"), Zhiyi lists five kinds of causes and conditions for the arising of illness. This is one of the most systematic classical definitions of "etiology" in East Asian Buddhism:
「病发虽复多途，略出不过五种：一者、四大增损；二者、饮食不节；三者、坐禅不调；四者、鬼神得便；五者、魔神所乱。」
*"Though the ways in which illness arises are many, in brief there are no more than five: first, the increase and decrease of the four great elements; second, immoderate eating and drinking; third, improper regulation in sitting meditation; fourth, the taking advantage of opportunity by ghosts and spirits; fifth, disturbance by māras and spirits."*
This passage is not metaphor, not visualization — it was written as genuine medical diagnostic analysis. Every item must be preserved; none can be flattened —
First, the increase and decrease of the four great elements (四大增損). The "four great elements" here are not a mystical concept but a basic material classification that Buddhism inherited from ancient Indian medicine (comparable to the Chinese medical tradition): earth (bones, flesh, solidity), water (blood, bodily fluids, flow), fire (body temperature, digestion, maturation), wind (breath, nerves, propulsion). The four elements must maintain relative balance; too much of one makes it excessive, too little makes it deficient, and excess or deficiency beyond measure produces illness. When earth increases, the body becomes heavy; when water increases, there is edema; when fire increases, there is fever; when wind increases, there is trembling and qi reversal. This is the direct physical/physiological basis of bodily illness.
Second, immoderate eating and drinking (飲食不節). Improper eating and drinking — too much or too little quantity, wrong timing, biased flavors and natures, alternating extreme hunger and binge eating, and so on. This item is listed alongside the "four great elements" in *Móhē Zhǐguān*, reminding us: even if your physical constitution (the four-element structure) is normal, long-term dietary imbalance can still cause illness. This is an extremely plain yet powerful reminder.
Third, improper regulation in sitting meditation (坐禪不調). This is the easiest item to overlook, yet it is especially important for practitioners. "Improper regulation" includes: improper body adjustment (sitting too long in stiffness or in laxness), improper breath adjustment (forcibly suppressing the breath, producing stuffiness and distension), improper mind adjustment (forcefully suppressing wandering thoughts, which drives up fire; forcing oneself into concentration, which produces mental confusion). It reveals something counterintuitive to modern people: the practice itself can also be a cause of illness. Meditation is not "the more the better"; practicing wrongly can genuinely produce illness.
Fourth, ghosts and spirits seizing an opportunity (鬼神得便). This is a category that modern people may frown upon, but the classics preserve it with full seriousness. The phrase "seizing an opportunity" (得便) is especially crucial — it is not that ghosts and spirits actively create illness, but that when a person's four elements, diet, and mind have vulnerabilities, external non-human beings take "the chance" to disturb. This is equivalent to acknowledging, within the network of dependent origination, a class of conditions originating from the non-human realm. Distinguishing this requires relying on a teacher with a lineage — it is not something one decides by oneself; Zhiyi also emphasized in the original text that this item must not be arbitrarily judged.
Fifth, disturbance by māras and spirits (魔神所亂). "Māra" (魔) has a clear referent in Buddhism — the four māras: the māra of afflictions (kleśa-māra), the māra of the aggregates (skandha-māra), the māra of death (mṛtyu-māra), and the māra as celestial being (devaputra-māra). This is a subtler and deeper source of disturbance, often not an external "thing" but obstructive forces that arise as practice deepens. For example, terrifying visions, grasping at experiences, sudden profound sorrow or great joy that appear at certain stages of meditation — the classics largely classify these under the category of "māra." This item differs from "ghosts and spirits": ghosts and spirits are beings of a different class, while māras are obstructions tied to the structure of cultivation and realization itself.
Finally, what must be grasped is the underlying "unity of body and mind" (身心一如). Buddhism never says "the body is a container for the mind" or "psychological problems cause physical problems" — such dualistic formulations. Body and mind are two faces of the same network of dependent origination, mutually interpenetrating. So although Zhiyi's five causes are enumerated as separate items, in reality they often break out together — for example, a workplace crisis (mental stress / the sitting-meditation-style forcing of oneself to concentrate), accompanied by insomnia (increase and decrease of the four elements), late-night snacks and alcohol (immoderate eating and drinking), excessive sensitivity to external circumstances (easy for ghosts and spirits to seize an opportunity), and an eruption of self-grasping (disturbance by māras). The items are separated for analysis; the whole is for contemplation.
A Walk-Through in Daily Life
Example one: Neck, shoulder, and lower back pain in a chronic overtime worker
A 38-year-old project manager, two consecutive months of pushing through work, ten hours a day at a desk. Stiff neck and shoulders, migraines, insomnia, anxiety. Within the framework of *Móhē Zhǐguān*, this symptom cluster involves at least three items:
- Increase and decrease of the four great elements: wind and fire are both excessive — prolonged sitting and immobility block the movement of qi (wind off-balance), while screens and deadlines drive the heart-fire upward (fire off-balance). - Immoderate eating and drinking: caffeine props up the day, late-night snacks and alcohol soothe the night; the actual rhythm of the stomach and spleen is thoroughly disrupted. - Improper regulation in sitting meditation: he is not a meditator, but he does something very "sitting-meditation-like" — forcing the mind into prolonged high-intensity concentration without regulating the breath. Modern people call this "focus," but in the meditation tradition, if concentration is not coordinated with breath and body regulation, it is the modern version of this item of "improper regulation."
Example two: Stomach illness after emotional eating
A 30-year-old woman, after a breakup, over several months has fluctuating weight, recurrent bloating, indigestion. Endoscopy shows no organic problem.
- Immoderate eating and drinking is the most direct: sadness makes her "feed" herself large amounts of sweets and heavy-flavored food, meal times are chaotic, and the stomach's rhythm is repeatedly broken. - Increase and decrease of the four great elements: prolonged grief and worry make qi stagnate and sink (earth element too heavy, wind element too weak), and the body exhibits a "heavy, stagnant, cold" character. - Improper regulation in sitting meditation: she repeatedly scrolls her phone before sleep, forcing herself to fall asleep but unable to — this is another form of improper mind regulation. - The "ghosts and spirits" and "māras" items are not directly relevant in this example — this is an important reminder: not every illness requires all five factors to be present.
Example three: Mental disturbance in high-intensity practitioners
In recent years, media has occasionally reported that long-term retreatants or high-intensity meditators experience psychiatric symptoms upon emerging from meditation — auditory hallucinations, delusional thoughts, panic attacks, mania. Zhiyi specifically classifies this kind under the intersection of "improper regulation in sitting meditation" and "disturbance by māras" — if meditation is practiced without guidance, with improper body and breath regulation, and with forcible suppression of scattered thoughts, what "seizes the opportunity" is not an external force but the manifestation of māra-obstructions deep in the mind.
Example four: Contemporary "ghosts and spirits seizing an opportunity"
This item must be discussed with the greatest restraint.
It should not be naively translated as "psychiatric illness," "psychological problem," or "just a stress reaction" — such a translation both unfairly cancels the respect this Buddhist tradition has for this class of dependent origination, and prematurely makes a diagnosis on behalf of modern medicine.
But it should also not be infinitely exaggerated — not every inexplicable illness should be suspected of involving ghosts and spirits.
A more honest contemporary mapping is: when a person is severely imbalanced in body, mind, and rhythm (with the four elements, diet, and meditation all off-balance), he becomes especially sensitive and vulnerable to "external conditions" in his environment — interpersonal influences, emotional contagion, group atmosphere, social pressure. Traditionally this is called "seizing an opportunity" (得便): it means he first created an opening for himself; the external conditions merely came up to fill it. To treat it directly as "there really are ghosts" or directly as "there absolutely are no ghosts" both deviate from Zhiyi's original intent. The method of discernment in the tradition is very clear: it must be diagnosed by a teacher with a lineage, based on meditative experience — not by one's own suspicion.
Why Contemporary People Need It
The modern significance of Buddhist etiology lies not mainly in replacing medicine, but in supplementing it.
Contemporary mainstream biomedicine is good at handling the two items of "increase and decrease of the four great elements" and "immoderate eating and drinking" — it has powerful tools at the molecular, nutritional, and fluid levels. But on the two items of "improper regulation in sitting meditation" and "disturbance by māras," it is almost speechless. Terms like "sub-health," "functional gastrointestinal disorder," "chronic fatigue syndrome," and "medically unexplained symptoms" — these diagnostic labels are themselves medicine's compromise when it encounters the two types of causes and conditions of "improper regulation" and "māra."
Over the past few decades, research in psychoneuroimmunology, stress physiology, and Mindfulness-Based Stress Reduction (MBSR) has increasingly shown that long-term psychological states (loneliness, suppression, hostility, hypervigilance) significantly alter cortisol, inflammatory factors, and autonomic nervous rhythms, thereby changing the onset and prognosis of disease. This is not contradictory to the Buddhist diagnosis of "unity of body and mind," but the two are not equivalent — Buddhism does not hold that "science has finally proven the Dharma," but rather acknowledges that these studies confirm, on certain sides, the observations of dependent origination, and reminds us: the Buddhist classification is an empirical, cross-cultural observational framework, operating at a different level of language from modern medicine.
Another contemporary value: the term "cause of illness" itself, within Buddhism, already contains the antidote. Since illness is dependently originated, it is not eternal, not self-punishment, not incurable. Each of the causes and conditions has a corresponding remedy — for the four elements there are 28 methods of breath control (counting the breath, following the breath, calming-and-contemplating breaths, etc.); for diet there is regularity; for ghosts and spirits there are repentance and mantra recitation; for māras there are the twenty-five protective deities and mindfulness as remedies. Etiology and therapeutics are one system in Buddhism — this stands in contrast to the Western culture of "diagnosis" and "treatment" being sharply separated, with a vast amount of "unknown cause" in clinical practice.
Common Misreadings and Clarifications
Misreading one: "All illness is karmic obstruction."
This is the most common folk simplification. Buddhism acknowledges karmic-obstruction illness (illness arising from past karma), but it is only one of many causes of illness. Zhiyi's system implicitly includes karmic-obstruction illness alongside the "four great elements" and "diet" — it may not be listed separately, but it certainly does not claim that all illness is caused by past lives. When illness occurs, the first response should be to examine the present body, speech, mind, and environment, not to immediately attribute it to past lives. Repeatedly explaining all illness as "karmic obstruction" is both an evasion of responsibility for one's own lifestyle and a crude form of spiritual harm inflicted on the dying and the terminally ill.
Misreading two: "All illness comes from not thinking things through."
The other extreme is over-psychologizing — explaining all illness as "psychological problems" or "emotional knots." This kind of claim swallows up Zhiyi's two items of "improper regulation in sitting meditation" and "disturbance by māras," and mistakenly assumes that modern psychology can replace Buddhist observation. It ignores the material basis of the body itself, the physical effects of diet, and the possible deviations of practice itself. "Unity of body and mind" precisely opposes one-directional causation — not all stomach illness is repression, and not all depression is nutrition.
Misreading three: "Practitioners should not get sick."
This is contrary to the Buddha's teaching. The Buddha himself suffered back pain in his later years (the *Dīrghāgama* 長阿含經, "Sūtra of the Wandering" 遊行經, records him manifesting illness several times during his final journey), and Ānanda also asked about the correct attitude of monks toward illness (in multiple places in the *Saṃyuktāgama* 雜阿含經). "Freedom from illness" is not the standard of practice; "being able to abide peacefully while ill, without losing right mindfulness" is. Zhiyi's entire chapter on "Treating Illness" was written for those practicing calming and contemplation — he himself wrote, for practitioners, a guide saying "you will certainly get sick; illness is a normal part of practice."
Misreading four: "Ghosts and spirits / māras are just superstition."
Too hasty a judgment. Contemporary intellectuals often dismiss "ghosts and spirits" as pre-scientific error. But Zhiyi places them in the same system, side by side with the "four great elements" and "diet," reminding us: the Buddhist multi-causal observation of illness presupposes a world that is not only material. You may choose not to incorporate this item into your own practice, but that is a different matter from "acknowledging that it has a full position in the text." Likewise, translating "māra" as "just hallucination" or "just psychological projection" also amputates what it originally refers to — a deep obstruction entangled with the structure of cultivation and realization itself.
Misreading five: "Finding the cause of illness can cure the illness."
This projects the modern medical causal model onto Buddhism. The Buddhist "cause of illness" is for diligent counteraction and如实 contemplation — not for locating a culprit. "Increase and decrease of the four great elements" does not point to some external pathogenic factor; it points to the state of imbalance one's own body is currently in — a state that is to be seen and nurtured, not to be found an enemy.
A final word: "Cause of illness" in Buddhism is not knowledge; it is contemplation. Understanding Zhiyi's five causes and conditions may not make your cervical spine better, your diabetes heal, or your anxiety disappear — but it will make you re-examine the fact of your being ill itself: so I am ill — it is not just that the body has malfunctioned; this "I am ill" is itself an entire network of causes and conditions manifesting — and every thread in the network points to a way of living that can be responded to in the present moment. This is the part of this classical entry most worth taking away in the contemporary world.