The kidneys lie beneath: gentle pressure only, never hard or sharp.
三焦俞 Sanjiaoshu
“Triple-Burner Transport” · BL22
Foot Taiyang · 22 of 67 · back-shu of the san jiao
Where. On the lower back, one bump above navel level (below the first lumbar bump), two finger-widths from the spine.
For. Bloating; a rumbling belly; a stiff lower back.
Press. Hands on hips, press with the thumbs, fairly firm, about a minute.
Caution. The kidneys lie beneath: gentle pressure only, never hard or sharp.
三焦俞，在第十三椎下，兩傍各一寸五分按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Sanjiaoshu Sits on the Lower Back
Sanjiaoshu takes its place on the lower back, in the band where the rib cage finishes its business and the sturdy lumbar spines begin. The dataset locates it precisely: on the lower back, below the spinous process of the first lumbar vertebra, 1.5 cun lateral to the posterior midline. Unpacked for hands rather than rulers: the lower back carries five large vertebrae whose ridges sit broader and flatter than the finer ridges of the chest, and the first of them rises at roughly the height a belt would ride. Beneath that first lumbar ridge lies a soft step between it and the next; step sideways from there one and a half cun, and there, mirrored on both sides of the spine, sits Sanjiaoshu.
A cun is the traditional measuring unit of Chinese point-location: proportional lengths taken from the person being examined rather than from a ruler, so a cun at the waist of a broad-framed adult differs from a cun on a slight teenager. One practical rendering passed along through self-location teaching holds that the width of the index and middle fingers pressed together comes close to one and a half cun on many adult hands — helpful arithmetic, worth trusting only alongside the bony landmarks. The terrain beneath the skin is kinder here than farther up the back. The ribs have already gathered in — the lowest of them floats above this neighborhood rather than through it — leaving a broad apron of lumbar muscle flanking the spine, with comfortable padding between fingertip and anything deeper.
The neighborhood completes the map. One ridge higher stands Weishu (BL21), the stomach’s transport; one ridge lower sits Shenshu (BL23), the kidney’s transport, recorded as level with the navel — a handy cross-reference the walkthrough below puts to work. As for the channel: classical cartography draws the bladder meridian as the longest pathway in the body, sixty-seven stations strong, beginning at the inner corner of the eye, sweeping over the head, and descending the whole back to the little toe. Down the spine it travels in paired vertical routes, the inner one running 1.5 cun from the midline, and along that inner road classical teaching lined up the transports of the organs — a procession beginning beside the shoulder blades and continuing down through the lumbar and sacral reaches, with Sanjiaoshu keeping the station assigned to the triple burner.
A Self-Palpation Walkthrough
Stand with the feet under the shoulders and let the low back soften, or sit tall on a firm chair — hunching reshapes the terrain about to be read. Rest the backs of the hands on the hips and slide the fingertips backward along the upper rim of each hip bone until the rims crest at the sides of the waist; carry that belt line inward to the spine. For most bodies the ridge beneath the fingers there belongs to the fourth lumbar vertebra — bodies vary, which is exactly why the walkthrough builds in checks. Now walk straight up the centre seam and let the ridges pass beneath a fingertip, counting quietly: third, second, first. Rest the pad of the finger in the soft step immediately beneath the first lumbar ridge, slide outward across the muscle until roughly the width of two pressed-together fingers is crossed, and settle where the flesh forms a gentle cord-like column. Repeat the whole search on the other side.
Confirmations cost nothing. Touch feather-light and compare sides: many people register a faint, dull awareness at the genuine spot and little sensation a thumb-width away. Bring in the navel next: Shenshu, one ridge lower, rides level with the navel, so the step you have chosen should sit one full ridge above navel height — if it sits level with the navel itself, the search has stopped one vertebra short. Take a slow breath and notice how little the low back stirs compared with the chest; that stillness quietly confirms the search stayed where it belongs. If bare bone meets the fingertip, the search has wandered onto the spine itself; ease sideways back onto the muscle column and begin again from the ridge.
Three slips account for nearly every mislocation. First, miscounting from the belt line: the ridge under the fingers at hip-bone height is a starting post, and the count runs upward from it — treating it as the first lumbar drops the whole search three vertebrae low. Second, descending from the ribs instead: the climb down from the twelfth rib is longer, crosses the junction where chest meets loin, and loses count more easily; the short ascent from the pelvis is the steadier route. Third, forgetting the mirror pair — there are two Sanjiaoshu, and neither substitutes for the other when both sides of the low back feel heavy. When doubt outlives every test, resist guessing from wherever the wandering ended; go back to the hip bones, confirm the belt line once more, and recount slowly upward.
Reading the Name: Triple-Burner Transport
The name announces its own job. San 三 means three — plainest possible arithmetic. Jiao 焦 is the burning character: it carries fire at its foot, and generations of commentators read the three burners as stages of warming, ripening, and transforming through which food, drink, and fluids pass. Shu 俞 is the suffix familiar from the whole row of stations beside the spine — the character of transfer, carrying the old sense of conveying or infusing, the way water passes along a channel from reach to reach. Put together, Sanjiaoshu reads almost bureaucratically: the triple burner’s transport, the place where the triple burner system delivers its activity toward the back. Of all the names in this collection, this one hides least.
The triple burner itself deserves a patient introduction. Classical medicine counts it among the six fu, the bowel-like organs of transport, and pairs it with the pericardium; yet the old texts describe it as having a name without a single corresponding shape — a ministry that keeps its ledger in plain sight while owning no dedicated building. Its jurisdiction was drawn in thirds: classical imagery compared the upper burner to a mist spreading warmth and moisture across the chest, the middle burner to a foaming vat where food and drink are steeped and ripened, and the lower burner to a drainage channel through which fluids are separated and sent on their way. Running through all three, the tradition assigned the san jiao the office of roadway — the passage along which water and qi travel to their stations. A body-wide superintendency of fluids, in other words, and one that classical teaching chose to address here, on the lower back.
Pinyin renders the recorded name Sānjiāoshū. The opening syllable rides a flat, high first tone, and the second holds that same bright, level pitch — the name comes out steady from start to finish, fitting for a station whose whole business is smooth flow; the reading of the closing syllable follows the point-name conventions recorded in the licensed dataset. The hanzi trio 三焦俞 stays compact and legible once met, and like many points named for offices — gates, courtyards, storehouses, relay posts — the metaphor performs real labor. It tells you the tradition filed this spot under plumbing and logistics rather than drama: wherever water hesitated in its rounds, this was the address to which attention was forwarded. The name is a small set of instructions for remembering what the station is for.
Traditional Indications, Explained
The recorded indications read: borborygmus, abdominal distension, diarrhoea, edema, difficult urination, enuresis, and stiff painful back. The first three travel together in the traditional telling. Borborygmus is the formal word for the gurgling and rumbling the belly makes on its own schedule; abdominal distension is the subjective balloon of fullness and pressure; diarrhoea, in the old records, covers loose and urgent stools of many patterns. In the classical frame these belong to the middle and lower burners — the steeping vat and the drainage channel — where qi and fluids are meant to move onward without fuss. Where that movement stalled, the triple burner’s own transport stood among the ready addresses, and classical practice traditionally reached for it when gurgles, bloat, and looseness crowded into the same complaint.
Then come the water entries, and they hang together by the same logic. Edema — swelling as fluid settles into tissue — difficult urination, and enuresis, the involuntary wetting that in the old books usually refers to night-time bedwetting, all read in the tradition as the waterways faltering somewhere along their route: the mist failing to descend, the vat failing to transform, the channel failing to separate and release. Cooperation with the kidney and bladder systems runs through every classical discussion of these complaints, and this station kept the san jiao’s seat at that table. An honest modern footnote belongs right here: urinary difficulty and persistent wetting, in a child or an adult, are symptoms that deserve proper clinical assessment first — pressing a point is comfort work, never a substitute for that assessment.
Last on the list, stiffness and pain of the back, looks less like doctrine than geography. The bladder meridian pours down the entire back in paired routes, and the inner line on which Sanjiaoshu stands threads the long columns of muscle flanking the lumbar spine — tissue that complains readily after long sitting, cold, or strain. Stations along that road served the territory they traversed, and the low back sat squarely in this station’s territory. It bears repeating plainly: these are the traditional uses recorded in a licensed dataset and classical literature, offered for cultural and historical understanding, not claims that pressing this point treats disease. Where modern research touches self-applied pressure at all, reviews suggest effects are modest and context-dependent, and evidence specific to any single point remains thin.
Self-Care Acupressure at Home
Of the whole back, the low back asks the least gymnastics: both hands reach it without help. Stand with the feet under the shoulders and the knees soft, or perch on a firm chair. Warm the hands first — chilled muscle guards — then place the pads of both thumbs, or the curled index and middle fingers, on the muscle column found earlier. Begin with contact alone for a few slow breaths, then add small, unhurried circles, letting the skin glide over the tissue beneath rather than grinding against the ridges of bone. Pressure should register as pleasant dullness or mild warmth, never sharpness. A common home rhythm is one to three minutes per side, once or twice daily, each circle riding a long exhale out; then swap emphasis and match the other side.
Quality outranks duration, as it does everywhere in gentle practice. Light, patient, regularly repeated contact is the whole discipline; jabbing teaches the body nothing and grumbles against bone besides — if a circle keeps bumping the spine, widen it outward onto the muscle. Choose a quiet corner over a screen and let the session double as a posture reset: many people find the low back loosens its guard under nothing more than two minutes of unhurried attention. Readers who keep routines anchor this one somewhere natural — after washing hands before dinner, during the evening stretch, before lights-out. Consistency, not intensity, is what self-care traditions actually ask for, here as everywhere.
Treat the exercise as a few minutes of attention paid to a stretch of yourself that cannot see itself. Across weeks you may notice the area feels less guarded, or simply that you spent ninety seconds tending your own lower back — both outcomes fit the honest scope of self-acupressure. What does not fit is escalation: pressing harder, longer, or deeper to force a result. Curiosity pulling that way should meet the same answer every time — return to gentleness, or stop for the day. The station is not going anywhere; tomorrow it will wait at the same address beneath the first lumbar ridge.
Cautions and Safe Practice
Honesty first: the licensed record carries no specific caution for this point — a quieter file than its cousins farther up the back, whose warnings about the lungs fill whole paragraphs. Geography explains the difference. By the time the search reaches the first lumbar vertebra the rib cage has closed its shop; beneath the broad apron of lumbar muscle lie structures that belong to professional assessment and professional hands alike, and household acupressure honours them by never leaving the surface. Gentle, superficial contact engages skin and the outer layers of muscle only, far short of anything the body keeps private. The absence of a recorded caution is permission for lightness, never an invitation to lean in.
The standing rules apply in full. Use finger pads — never elbows, knuckles, tools, or devices. Keep pressure light and stop well short of pain; skip the point entirely over broken or irritated skin, during feverish illness, and whenever the body is fighting something acute. After recent back injury or surgery, wait until a clinician clears ordinary activity before adding any point practice. Sharp, electric, or radiating sensation means stop at once, and not again that day. Pregnant readers should consult a qualified practitioner before adding any new point practice, and anyone managing kidney, bladder, or bowel conditions will want the same conversation first. And when energy runs low, the wisest session is the postponed one — rest is also self-care.
Over everything stands the wider rule: this page is educational, and acupressure is self-care, not diagnosis or therapy. Seek prompt medical care — not a longer pressing session — for blood in the urine or stool, difficulty or inability to pass urine, fever alongside back pain, numbness or weakness in a leg, sudden severe back pain after a fall or blow, a persistent change in bowel habit, or weight loss without trying. Persistent complaints belong with a licensed practitioner, medical or East Asian medical as suits the problem. The transport image earns its keep one last time here: a good station forwards what arrives without delay — and the safest habit this point can teach is forwarding worrying symptoms to the people trained for them.
Sanjiaoshu — the Triple-Burner Transport — stands on the lower back, below the first lumbar ridge and a thumb-and-a-half out from the spine’s central seam. Classical teaching made it the address where the triple burner, the tradition’s roadway for water and qi, delivers its work to the back. This guide walks through finding it by touch and pressing it gently.
Self-care limits
Frequently asked
- How do I find Sanjiaoshu without knowing anything about cun?
- Use the hip bones and the navel as the whole map. Ride the rim of either hip bone backward to the spine to set the belt line, then walk straight up the centre seam counting three ridges; settle into the soft step beneath the first, and slide outward about the width of two pressed-together fingers onto the muscle column. Cross-check with the navel: the ridge below your spot should sit level with it. Cun measurements encode the same landmark sequence in proportional language.
- Is pressing Sanjiaoshu myself actually safe?
- Gentle fingertip pressure held on the surface is generally reasonable self-care for healthy adults, and the licensed record carries no specific caution for this point. The deeper structures of the low back belong to professional care — a category home acupressure never approaches. Keep the usual discipline all the same: light finger pads, no tools, nothing over broken skin, and an immediate finish if anything sharp or radiating appears.
- What did classical practice use Sanjiaoshu for?
- The traditional record lists borborygmus — gurgling belly sounds — abdominal distension, diarrhoea, edema, difficult urination, enuresis, and a stiff painful back. The thread tying them together is the triple burner’s classical office as roadway of water and qi. Those are traditional frameworks for understanding the body, documented for context — not evidence-backed treatment claims.
- Why does a point exist for an organ with no physical form?
- Because the tradition treated function, not flesh, as the thing worth addressing. Classical texts describe the triple burner as having a name without a single corresponding shape — yet its duties, overseeing the passage of fluids and qi through three regions of the trunk, were real enough to earn it a place among the organs and an address on the back like every other. The point marks where its work was understood to surface, not where an anatomist would look for it.
- Can acupressure at Sanjiaoshu replace seeing a doctor about urinary or digestive troubles?
- No. Self-acupressure is a comfort practice, not a diagnostic tool. Blood in urine or stool, difficulty passing urine, fever with back pain, leg numbness or weakness, or persistent changes in bowel habit call for professional assessment promptly — think of daily self-care and clinical medicine as caretakers of two different doors, each minding its own threshold, neither substituting for the other.
Sources
- 01WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), World Health Organization — nomenclature conventions.
- 02A Manual of Acupuncture, Peter Deadman, Mazin Al-Khafaji and Kevin Baker — point-name tradition, back-shu theory, and san jiao doctrine context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for BL22 Sanjiaoshu — location, point class, and action record.
Last reviewed
牌記This leaf, for machines
Old books ended with a colophon saying who printed them. Every leaf here carries the same facts as structured data for agents and search, with no layout in the way.
- GET /en/points/bl22/leaf.json
- GET /zh-hant/points/bl22/leaf.json
- GET /zh-cn/points/bl22/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "BL22",
"name": {
"en": "Sanjiaoshu",
"gloss": "Triple-Burner Transport",
"zh-Hant": "三焦俞",
"zh-Hans": "三焦俞"
},
"channel": {
"id": "BL",
"order": 22,
"of": 67
},
"location": {
"text": "On the lower back, one bump above navel level (below the first lumbar bump), two finger-widths from the spine."
},
"for": [
"bloating",
"a rumbling belly",
"a stiff lower back"
],
"press": {
"text": "Hands on hips, press with the thumbs, fairly firm, about a minute.",
"seconds": 60
},
"cautions": [
"The kidneys lie beneath: gentle pressure only, never hard or sharp."
],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/bl22",
"lastReviewed": "2026-08-24"
}