小腸俞 Xiaochangshu
“Small Intestine Transport” · BL27
Foot Taiyang · 27 of 67 · back-shu of the small intestine
Where. On the flat bone at the base of the spine, level with its top hollow, two finger-widths from the centre ridge.
For. Low back and sacral ache; loose stools.
Press. Reach behind and press with the fingertips, about a minute.
小腸俞，在第十八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 Xiaochangshu Sits on the Sacrum
The sacrum is the broad, upside-down triangle of bone set between the two hip bones at the back of the pelvis, below the waist’s last mobile vertebrae and ending above the tailbone. The dataset places the point precisely: on the sacrum, 1.5 cun lateral to the median sacral crest, level with the first posterior sacral foramen. Unpacked for hands rather than rulers: the median sacral crest is the knobbly central ridge that runs down the middle of the sacrum’s back face, the fossil line of fused spines. Step outward from that ridge by one and a half cun, at the height of the uppermost of the four pairs of small openings set into the bone — and there, mirrored on both sides, sits Xiaochangshu.
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 across a broad pelvis differs from a cun on a slight frame. 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. Beneath the fingertips the terrain is kind. The point rests on the soft muscular slope that drapes the upper sacrum, where the muscle sheet covering the buttock takes its start; the bone itself lies close, but everything deep within the pelvis lies far beyond anything gentle fingertip work could ever reach.
The neighborhood completes the map. One station higher, just before the sacrum begins, Guanyuanshu (BL26) stands below the fifth lumbar ridge on the lower back proper. One station lower on the same line, level with the second pair of openings, sits Pangguangshu (BL28), assigned to the bladder itself. Classical teaching lined the organs’ addresses along the inner route of the bladder meridian — the longest pathway in the body, sixty-seven stations strong, drawn in the old cartography from 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 that road continues onto the sacrum, carrying the transports down the central ridge to the fourth opening. Xiaochangshu keeps the small intestine’s office where lower back becomes pelvis.
A Self-Palpation Walkthrough
Reaching this point asks less gymnastics than the mid-back demands. Stand or sit tall, and bring both hands behind you, palms settling on the beltline. Walk the fingertips straight down the centre seam, past the waist, feeling the regular knobs of the lumbar spine pass beneath. At the bottom the knobs run out: the ridge gives way to a broader, flatter triangle of bone. That junction — the step from mobile spine onto quiet plateau — marks the top of the sacrum, just below the fifth lumbar vertebra. Rest a thumb there and trace downward an inch or so: the central ridge gathers itself again into a line of small bumps. This is the median sacral crest, and its uppermost stretch is the address you want.
From the top of the ridge, slide outward across the slope until roughly the width of two pressed-together fingers lies between your pad and the bone’s centre line, and settle onto the soft tissue there. That resting place, on either side of the ridge, is the point. 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. Check the height: the search belongs to the uppermost quarter of the sacral triangle, nowhere near the tailbone. Many people can also feel two shallow dimples just above the buttocks, one each side; they hover near the upper corners of the triangle, a friendly sign your starting point sat high enough. If bare ridge meets the fingertip, ease outward off the bone onto the soft slope and begin again.
Three slips account for nearly every mislocation here. Drifting downward comes first — the sacrum is generous in length, and searches begun correctly often wander toward the tailbone; the correction never changes: climb back to the plateau’s top. Sliding outward toward the side of the hip comes second; the true spot stays close to the ridge, on the fleshy slope, not out where the buttock rounds away. Pressing proudly atop the bone itself, mistaking the ridge for the point, comes third — the point leaves the ridge behind. And there are always two Xiaochangshu, one each side; neither substitutes for the other. When doubt outlives every test, resist guessing from wherever the wandering ended: return to where the knobs run out, confirm the plateau, and measure outward once more, slowly.
Reading the Name: Small Intestine Transport
The name is a job description in three characters. Xiao 小 means small, plain vocabulary doing plain work. Chang 腸 names the bowel-family of organs, the same character that appears in the word for the intestines as a whole. Shu 俞 belongs to the family of characters used across the point catalogue for stations of transfer, carrying the old sense of conveying or infusing, the way water passes along a channel from reach to reach. Together the name reads as the small intestine transport: the place where the small intestine system delivers its activity toward the back. Classical teaching set an entire series of such addresses beside the spine, one for each of the organs, all sharing the suffix character; wherever the tradition wanted to say that an organ keeps a window on the back, it wrote shu — and on the sacrum, the office fell to the small intestine.
The small intestine occupied a distinctive seat in classical physiology. Among the five phases, classical teaching pairs it with the heart under fire, the bright element of warmth and movement. Its working was described as receiving and sorting: classical texts describe the small intestine parting what arrives into the clear and the turbid — essence held, waste passed onward, fluids divided between keeping and releasing. In that frame, complaints in which the body’s waters ran astray found their way to the organ’s back address in classical discussions. The lists also liked pairing: each back transport had a companion gathering place on the front of the trunk called a mu point, and for the small intestine that companion is Guanyuan (CV4), low on the belly’s midline — front door and back window, tradition suggested, holding one office between them. All of this is the heritage’s own weather map, offered warmly for understanding, not as anatomy confirmed.
Pinyin renders the name Xiǎochángshū: xiao dips through the falling-rising third tone, chang climbs on the rising second tone, and shu rides a level, high first tone. The hanzi trio 小腸俞 stays legible at a glance — small, bowel, transport — and like many points named for whom they serve rather than where they hide, the label performs real work. Gates imply watching a threshold; transports imply delivery. The name quietly states its instructions: whatever concerns the small intestine’s sorting work, this is where the tradition delivered its attention on the back. A reader who remembers the three characters carries the whole doctrine in miniature.
Traditional Indications, Explained
The recorded indications read: nocturnal emission, enuresis, blood or pain on urination, vaginal discharge, diarrhoea, dysentery, and lumbosacral pain. The first cluster travels together in the traditional telling. Nocturnal emission and enuresis were the era’s headings for involuntary losses of seed and of water — matters the old records discussed without embarrassment, reading them as the body’s gates failing to hold, and the small intestine’s sorting duty gave its back address a natural seat whenever the water passages misbehaved. Vaginal discharge joined the same conversation about fluids and their governance. Framed as tradition rather than promise, these entries describe how classical practice organised its thinking — and several of them name experiences that today call for a clinician’s assessment rather than a self-care routine.
Then come the grave entries, and honesty asks that they be read slowly. Blood in the urine was treated with gravity in every era that recorded it, and nothing has changed: today it is a signal that belongs before a doctor promptly — a reason to seek assessment, never a target for pressing. Painful urination, discharge that persists or smells unusual, diarrhoea that stretches on or arrives with fever: each of these belongs with professional care as well. Dysentery was, in the vocabulary of older eras, a heading for severe and often dangerous bowel illness; the record preserves such entries because records preserve everything. This page repeats them so the list is quoted faithfully and so nobody mistakes their weight for an invitation.
Last on the list, lumbosacral pain reads like the local entry it is. The bladder meridian pours down the entire back in paired routes, and the inner line on which this point stands runs beside the spine from shoulder to sacrum; stations along that road served the territory they traversed, and the muscles draped over the sacrum share the long column of tissue that aches in many tired backs. It bears repeating plainly: these are traditional uses recorded in a licensed dataset and classical literature, presented 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
Once located, settle into position: standing or seated tall, shoulders heavy, both hands reaching behind. Curl the fingers and rest the pads — never the tips — on the soft slope beside the ridge, one hand per side, or one side at a time if that feels steadier. 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 bone close by. 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; keep the two sides matched, whichever order you choose.
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 startles a low back that may have spent the day braced against a chair. Warm cold hands first, because chilled muscle guards. Choose a quiet corner over a screen and let the session double as a pause — the sacral stretch of the back almost never receives deliberate attention, and simply being attended to settles many people. Readers who keep routines anchor this one somewhere natural: after the evening shower, before lights-out, or during the afternoon lull. 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, breathing feels easier while you press, or simply that you spent ninety seconds tending your own foundation — all 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 point is not going anywhere; tomorrow it will wait at the same address beside the ridge.
Cautions and Safe Practice
The licensed record attaches no specific caution note to this entry, and that quiet deserves a word. An empty caution field is not an invitation to force; it simply means the dataset preserved no particular warning beside this point the way they do for points lying over lungs or other delicate territory. The universal discipline stands unchanged: home practice is surface practice. Feather-light fingertip work engages skin and superficial muscle alone, and the bony ridge close beside the point argues for softness rather than against it — the ridge is a landmark to read, never a surface to grind on.
For fingertip practice the rules follow plainly. Keep contact light and strictly superficial, letting the intention stay in skin and superficial muscle. Use finger pads, never elbows, knuckles, tools, or devices. Skip the point entirely during feverish illness or any acute flare of illness, and over broken, irritated, or freshly shaved skin. After recent lower-back, pelvic, or abdominal surgery or injury, wait until a clinician clears ordinary activity. Sharp, electric, or radiating sensation means stop at once, and not again that day. Pregnant readers, and anyone living with ongoing bladder, kidney, or bowel conditions, should consult a qualified practitioner before adding any new point practice. And when energy runs low or unwellness visits, 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, pain or burning on urination, difficulty passing urine, any sudden change in bladder or bowel control, discharge that persists or smells unusual, diarrhoea that stretches on or arrives with fever, severe back pain, or back pain following a fall or blow. Numbness or tingling spreading into the groin or legs likewise calls for assessment promptly. Persistent complaints belong with a licensed practitioner, medical or East Asian medical as suits the problem. The image of the small intestine’s window on the sacrum is elegant, and it earns its keep as memory and meaning; but the safest gift Xiaochangshu offers most people is a calmer acquaintance with the base of their own back, tended lightly and surrendered promptly whenever the body asks for more than gentleness can give.
Xiaochangshu, the Small Intestine Transport, rests low on the back of the pelvis, a thumb-and-a-half out from the knobbly central ridge of the sacrum, level with its first pair of openings. Classical teaching made it the small intestine’s own address on the back. This guide walks through finding it by touch and pressing it gently.
Self-care limits
Frequently asked
- How do I find Xiaochangshu without knowing anything about cun?
- Use the sacrum as the whole map. Walk your fingertips down the centre seam of the lower back until the regular spinal knobs run out and a broader, flatter triangle of bone begins — that step marks the top of the sacrum. Trace the small bumps of the central ridge downward an inch, then slide sideways about the width of two pressed-together fingers onto the soft slope. Pangguangshu waits slightly lower on the same line, and the two confirm one another. Cun measurements encode the same landmark sequence in proportional language.
- Is pressing Xiaochangshu myself actually safe?
- Gentle fingertip pressure held on the surface is generally reasonable self-care for healthy adults, engaging skin and superficial muscle over a well-padded stretch of bone. The licensed record preserves no specific caution note for this entry — which speaks to its forgiving geography, not to permission for force. Respect the stop signals all the same: sharp pain, radiating sensation, or discomfort that worsens means finish immediately, and fever or acute illness cancels the session entirely.
- What did classical practice use Xiaochangshu for?
- The traditional record lists nocturnal emission, enuresis, blood or pain on urination, vaginal discharge, diarrhoea, dysentery, and lumbosacral pain. The name tells the headline: as the small intestine’s own transport point on the back, it anchored classical discussions of the body’s sorting and water-carrying duties. Those are traditional frameworks for understanding the body, documented for context — not evidence-backed treatment claims.
- Why does a point for the small intestine live on the sacrum?
- Classical cartography draws the bladder meridian descending the back along two paired routes, and the inner line — 1.5 cun from the midline — carries a procession of stations the tradition matched organ by organ from the shoulder all the way down the sacrum. The small intestine keeps its window at BL27, one station below the fifth lumbar ridge. Each back transport also had a front companion, the mu gathering place — for the small intestine, Guanyuan (CV4) on the lower belly — and tradition often read the pair as front door and back window holding one office between them.
- Can acupressure at Xiaochangshu replace seeing a doctor about urinary symptoms?
- No. Self-acupressure is a comfort practice, not a diagnostic tool. Blood in the urine, pain or burning on urination, difficulty passing water, a sudden change in bladder control, or discharge that persists all 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 small-intestine context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for BL27 Xiaochangshu — location, point class, actions, and caution 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/bl27/leaf.json
- GET /zh-hant/points/bl27/leaf.json
- GET /zh-cn/points/bl27/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "BL27",
"name": {
"en": "Xiaochangshu",
"gloss": "Small Intestine Transport",
"zh-Hant": "小腸俞",
"zh-Hans": "小肠俞"
},
"channel": {
"id": "BL",
"order": 27,
"of": 67
},
"location": {
"text": "On the flat bone at the base of the spine, level with its top hollow, two finger-widths from the centre ridge."
},
"for": [
"low back and sacral ache",
"loose stools"
],
"press": {
"text": "Reach behind and press with the fingertips, about a minute.",
"seconds": 60
},
"cautions": [],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/bl27",
"lastReviewed": "2026-08-24"
}