Not in pregnancy, or if you could be pregnant.
下髎 Xialiao
“The Lower Bone-Hollow” · BL34
Foot Taiyang · 34 of 67
Where. In the fourth small hollow, near the bottom of the sacrum, a little below and inside BL33.
For. Lower belly pain; constipation; low back ache.
Press. Reach behind and press with the fingertips, about a minute.
Caution. Not in pregnancy, or if you could be pregnant.
下窌，在第四空，俠脊陷者中按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Xialiao Sits at the Base of the Spine
The dataset locates Xialiao in one unhurried sentence: on the sacrum, below and medial to Zhongliao (BL33), exactly over the fourth posterior sacral foramen, beside the sacral hiatus. Unpacked for hands rather than rulers: the sacrum is the broad triangular bone at the back of the pelvis, the wedge on which the whole spinal column comes to rest between the two hip bones. Its rear surface carries four pairs of small passageways called posterior sacral foramina, and Xialiao stands exactly over the lowest of the four, mirrored left and right. Beside rather than upon matters too: the point lies next to the sacral hiatus, the soft gap at the lower rim of the sacral plate where the bony canal sheltering the nerves of the lower spine opens toward the surface.
A curious kindness hides in the wording: the dataset gives no cun distances at all for this station. Every liao is defined by its neighbor — Ciliao by the bony prominence of the hip above it, Zhongliao by Ciliao, and finally Xialiao by Zhongliao, one step further down and a shade closer to the midline. The chain ends anchored to the sacral hiatus, which is why self-location here starts from the bottom of the sacrum and climbs only a short way. The ground under the fingertip is unmistakable: skin, then a thin covering of tissue, then unyielding bone. Nothing rises and falls with the breath this far down, and the small midline ridge along the back of the sacrum grows quieter toward its lower end — terrain that rewards patient, feather-light exploration rather than pressure.
The neighborhood completes the picture. Three pairs of stations stand above on the same bony plate, each over its own foramen: Shangliao (BL31) over the first, Ciliao (BL32) over the second, Zhongliao (BL33) over the third — and classical practice discusses the four pairs together under the collective name of the Eight Liao. All belong to the bladder meridian, the longest pathway in the traditional cartography, sixty-seven stations strong, drawn from the inner corner of the eye, sweeping over the head, and descending the whole back to the little toe. The sacrum is where that long road reaches the territory of the body’s lower waterways, and in five-phase teaching the channel travels as one half of the water pair, host to the kidney’s deep reserves. An address at the road’s lowest landing suits the work tradition assigned here.
A Self-Palpation Walkthrough
Choose the posture that lets the low back soften: lying face down with a pillow under the ankles, or standing side-on to a mirror with weight even on both feet. Begin at the tailbone — the small, mobile tip of bone at the very base of the spine — and glide your fingertips straight up onto the flat bony plate of the sacrum. Within a short distance you will feel the plate give way to a shallow, softened gap flanked by two small rounded knobs, one each side: this gap is the territory of the sacral hiatus. From there, search a brief step upward, keeping your fingers close to the midline, for a faint depression in the bone on either side of the ridge — those paired hollows, sitting beside the hiatus, are where the dataset places Xialiao. Confirm the twin by repeating the whole search on the other side.
A few quiet confirmations help before any pressing begins. Touch feather-light and compare sides: most people notice a broad, dull awareness over the true spot and little sensation a finger-width away, while the bumpy ridge itself stays silent under equal pressure. Try the search lying down and again standing — muscles shift the covering tissue slightly between postures, which is normal, and the true hollows keep their address throughout. Because every liao is chained to its neighbor in the record, finding one honestly helps you audit the others: if what lies under your fingers sits far out on the soft buttock, or down on the mobile segments of the tailbone itself, climb back toward the midline and restart from the hiatus. When doubt arises, simply begin again at the tailbone and move slowly; speed is the enemy of this address.
The classic mistakes are few and worth naming. The first is sliding too low and settling on the tailbone proper, which is narrower, mobile, and tender to firm probing — Xialiao belongs to the fixed sacral plate above it. The second is drifting outward into the soft muscle of the buttock, away from the midline; the point hugs the lower end of the sacrum close beside its central structures. The third is mistaking the knobbly bumps of the midline ridge itself for the hollows. The fourth is pressing harder against bone hoping force will reveal what patience would have found anyway. Force teaches the fingers nothing here; lighten the touch, slow the search, and let the small depressions announce themselves.
Reading the Name: the Lower Bone-Hollow
The characters carry their meaning openly. Xia 下 means below or lower — the plainest downward word in the language. Liao 髎 belongs to the family of bone words: its radical is the character for bone, and in point names it denotes hollows, crevices, and passageways in the skeleton, the kinds of openings older generations of practitioners met with a fingertip long before instruments confirmed them. Together the pair reads as the lower bone-hollow — a job description so literal it almost needs no explanation. Of all the named hollows along the channel, this one stands lowest, and the name simply tells the truth about the address.
The naming also encodes an entire series. Four pairs of points ride the sacrum, one pair over each row of posterior foramina, and the tradition ordered them from above: Shangliao, the upper liao, over the first; Ciliao, the second liao, over the second; Zhongliao, the middle liao, over the third; and Xialiao, the lower liao, over the fourth. Old discussions treat the eight stations as a single set, consulted together whenever complaints of the lower trunk brought practice to this region, so that learning one address means inheriting a map of all eight. Reading the body as a set of named, ordered landmarks is classical method at its most practical: anatomy turned into an address book.
Pinyin renders the name Xiàliáo, and the tone marks repay character-by-character attention. The first syllable xia carries the falling fourth tone, written with a grave accent — xià — a delivery that drops firmly, the way the meaning drops downward; dictionaries of the language record exactly this reading for the character 下. The second syllable liao carries the rising second tone, marked with an acute accent — liáo — lifting as it finishes, again as the dictionaries give it for 髎. The hanzi pair 下髎 stays short enough to memorise at a glance. Like the gates, valleys, courtyards, and storehouses scattered along the channel, the metaphor here does honest work: it marks a working opening in the frame of the body, not scenery. The name is itself a small set of instructions.
Traditional Indications, Explained
The recorded indications read: abdominal pain, constipation, difficult urination, vaginal discharge, lumbosacral pain, and borborygmus with diarrhoea. Framed as tradition rather than promise, the list gathers itself around the lower trunk. Borborygmus is the old word for the audible gurgling of working bowels — the records name it without embarrassment, alongside constipation and diarrhoea, as disturbances of movement in the intestines that classical practice addressed at the sacral stations. Abdominal pain completes the bowel cluster: dull, settled discomfort of the lower belly rather than sudden severe pain, which has always belonged to urgent care rather than to any point on a map.
Difficult urination arrives by the most direct route imaginable: the channel passing through this very territory carries the bladder’s name, and in the traditional frame it was natural to consult stations along that road when the waterways hesitated. Vaginal discharge joins the same lower-trunk cluster, echoing the entries recorded for the liao stations above, where the old records repeatedly grouped urogenital complaints together. And lumbosacral pain is the local entry: the sacrum is the keystone that transfers the spine’s load into the pelvis, so ache settling at the base of the back was approached at the addresses the map kept there. Each item follows the same logic — the road serves the region, and practice served the region by way of the road.
It bears repeating plainly: these are the traditional uses recorded in a licensed dataset and classical literature, offered here for cultural and historical understanding. They are not claims that pressing this point treats disease, and nothing in this guide replaces assessment by a qualified clinician. 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. Persistent changes in bowel or urinary habits in particular deserve proper eyes on them before they earn a self-care routine. Hold the tradition lightly, and hold the safety rules firmly.
Self-Care Acupressure at Home
With the point located by the walkthrough above, settle into position: lying face down with the ankles supported, or standing with weight shifted so the low back releases. Reach behind with both hands and rest the pads of your index or middle fingers on the two spots at once — the pads, never the tips, and never an elbow or any tool. Begin with contact alone for a few breaths, then add small, slow circles, letting skin glide over the bony plate rather than grinding against it. Pressure should register as pleasant dullness or mild warmth, never sharpness. A common home rhythm is one to three minutes at a time, once or twice daily, matched where possible to long exhales, with the two sides kept symmetrical.
Quality matters more than duration. Warm your hands first if they run cold, because chilled tissue guards. Choose a quiet corner over a screen and treat the practice as a pause rather than a task; people who keep it up often anchor it to an existing habit — after the evening wash-up, before sleep — because consistency, not intensity, is what self-care traditions actually ask for. Pairing helps too: a minute of gentle pressure followed by easy movement, such as lying down, drawing both knees toward the chest, and rocking softly, suits the base of the spine far better than aggressive stretching of cold muscles. What this region asks of self-care, more than anything, is gentleness and regularity.
Treat the exercise as a small ceremony of attention rather than a treatment session. Across weeks, notice what changes: perhaps the area feels less guarded, perhaps the pause becomes the day’s quietest minute, perhaps nothing shifts except that you spend two minutes attending to your own foundation. Every one of those outcomes fits the honest scope of self-acupressure. What does not fit is escalation — pressing harder, longer, or deeper against unyielding bone to force a result. When curiosity pulls that way, return to gentleness or simply stop for the day; the hollows will still be there tomorrow, exactly where the tailbone and the hiatus said they would be.
Cautions and Safe Practice
This point carries a notably quiet record in the licensed data: the dataset lists no specific caution for Xialiao, unlike many torso stations whose warnings fill their entry lines. Geography explains much of that calm. Beneath the skin lies solid, well-covered bone — no lung riding high behind thin gaps between ribs, no eye, throat, or internal organ within reach of anything surface contact could exert — so the anatomical hazards that make other addresses exacting are absent here. But a quiet record is not a license for force: the point sits at the very base of the spine, close above structures that matter, home care never leaves the surface, and respect scales with proximity to the body’s central pillar.
For fingertip acupressure the practical rules are simple. Use finger pads only — never elbows, knuckles, or tools — and keep pressure light enough to stay pleasant throughout. Skip the point entirely over broken, bruised, or irritated skin, during an acute flare of back trouble, and for a stretch after any recent injury to the sacrum or tailbone or after surgery in the region, until ordinary movement has been cleared by a clinician. Sharp, electric, or radiating sensation means stop at once and do not try again that day. Pregnant readers should consult a qualified practitioner before adding any new point practice, and anyone living with osteoporosis or diagnosed nerve conditions of the lower spine does well to ask first too — not because gentle surface contact is known to harm, but because individual circumstances deserve individual advice.
And the wider rule stands over everything: this page is educational, and acupressure is self-care, not diagnosis or therapy. Some stories at the base of the spine need prompt professional attention rather than any pressure routine: numbness or altered sensation around the saddle area, any new change in bladder or bowel control, pain following a fall or accident, fever accompanying low back or sacral pain, or symptoms persisting without explanation beyond a few weeks. Seek licensed medical or East Asian medical care as suits the complaint — promptly, and alongside self-care rather than instead of it. The quiet record is reassuring, but the safest gift Xialiao offers most people is a kinder acquaintance with the base of their own spine: attended regularly, pressed gently, and sometimes simply left alone.
Xialiao, the Lower Bone-Hollow, sits at the very base of the sacrum, over the lowest pair of bony openings the bladder channel passes on its long descent of the back. Classical practice reached for the eight liao together when bowels, water passages, or the low back complained. This guide walks through finding it by touch and pressing it gently at home.
Self-care limits
Frequently asked
- How do I find Xialiao without knowing anything about cun?
- Start at the tailbone. Glide your fingers up from its tip onto the flat sacral plate until you feel a shallow gap flanked by two small knobs — the territory of the sacral hiatus. Search a brief step higher, close beside the midline, for a faint depression on either side of the ridge; that paired hollow is where the dataset places Xialiao. No measurements are needed, because the record defines this point by the hiatus and its neighbors rather than by distances.
- Is pressing Xialiao myself actually safe?
- Gentle fingertip pressure held on the surface is generally reasonable self-care for healthy adults: the licensed record lists no specific caution for this point, because solid bone lies close beneath the skin and nothing fragile sits within reach of surface contact. Safety here is mostly restraint and judgment — light force, pads not tips, healthy skin only, and an immediate stop if anything feels sharp or radiating rather than dull and pleasant.
- What did classical practice use Xialiao for?
- The traditional record lists abdominal pain, constipation, difficult urination, vaginal discharge, lumbosacral pain, and borborygmus with diarrhoea — a portfolio centred on the lower trunk. Classical discussion treats the eight liao as a set consulted together for complaints of this region, which is why bowel, urinary, and low back entries dominate the list. Those are traditional frameworks for understanding the body, documented for context — not evidence-backed treatment claims.
- What are the Eight Liao?
- Four pairs of bladder-channel points ride the sacrum, one pair over each row of posterior sacral foramina. Read from above, they are Shangliao (upper), Ciliao (second), Zhongliao (middle), and Xialiao (lower), and old discussions group all eight under one collective name. They were traditionally approached together for complaints of the lower trunk, so learning any one of the four hands you the whole map: same plate, same row structure, one ordered family of addresses.
- Can acupressure at Xialiao replace seeing someone about my symptoms?
- No. Self-acupressure is a comfort practice, not a diagnostic tool, and symptoms at the base of the trunk carry warning signs deserving prompt assessment — numbness in the saddle area, new changes in bladder or bowel control, pain after a fall, fever, or anything persisting beyond a few weeks. Think of the two as different floors of the same building: daily self-care lives downstairs, and clinical medicine keeps the consulting room upstairs that you visit when symptoms persist or frighten you. Neither substitutes 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, the Eight Liao series, and bladder-channel context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for BL34 Xialiao — location, point class, actions, and indication 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/bl34/leaf.json
- GET /zh-hant/points/bl34/leaf.json
- GET /zh-cn/points/bl34/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "BL34",
"name": {
"en": "Xialiao",
"gloss": "The Lower Bone-Hollow",
"zh-Hant": "下髎",
"zh-Hans": "下髎"
},
"channel": {
"id": "BL",
"order": 34,
"of": 67
},
"location": {
"text": "In the fourth small hollow, near the bottom of the sacrum, a little below and inside BL33."
},
"for": [
"lower belly pain",
"constipation",
"low back ache"
],
"press": {
"text": "Reach behind and press with the fingertips, about a minute.",
"seconds": 60
},
"cautions": [
"Not in pregnancy, or if you could be pregnant."
],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/bl34",
"lastReviewed": "2026-08-24"
}