ST-28 (Shui Dao) Waterway

What does ST-28 Shui Dao do?

Shui Dao ST-28 is the Stomach channel's water point of the lower abdomen — its name means "Waterway", and its recorded work is to open the passages by which fluid leaves the body. Sacred Lotus sources & references record its actions as regulating the lower burner and dispelling stagnation, and as benefiting the Bladder and the uterus. It lies on the lower abdomen two cun to the side of the midline, level with Guan Yuan REN-04, directly over the region the tradition assigns to the bladder and the womb — and unlike most Stomach-channel points it carries no five-shu, Source, Connecting or Xi-Cleft classification. Its clinical identity comes from position and from its name.

• Opens the water passages and promotes urination — the defining action, and the one the name states outright. The shui dao ("water pathways") are a specific idea in the classical physiology: the channels through which the Sanjiao is said to move and discharge fluid, ending at the bladder. A point named after them is a point for fluid that will not move.
• Regulates the lower burner and dispels stagnation — the general action for the lower abdomen, applied to distension, fullness and heaviness below the navel, and to the pain of things that have stopped moving there.
• Benefits the Bladder — recorded for retention of urine and for difficult, scanty or painful urination.
• Benefits the uterus and regulates menstruation — the gynaecological half of its repertoire, recorded for period pain, for irregular menstruation and for infertility. The Stomach channel's described course runs down through the lower abdomen at exactly this level, and the older texts treat the point as reaching the womb directly.
• Moves water that has collected — recorded for oedema and for lower-abdominal swelling and fullness.

A point with a job rather than a rank. It is worth being plain about this because it is unusual. Most of the points a reader will meet on this site earn their place through classification — a Source point, a Front-Mu point, a Confluent point. ST-28 has none. Its immediate neighbour ST-25 Tian Shu is the Front-Mu point of the Large Intestine and carries a large systemic repertoire because of it; ST-28, three cun lower, carries none of that. What it has instead is a location over the bladder and uterus and a name that says what it is for. That is a real and useful kind of point, and describing it as a lesser one would misrepresent how the lower abdomen is actually treated.

Source: Sacred Lotus sources & references (channel, the absence of any point-category classification confirmed by direct query, the ST-25 Front-Mu classification, and the existing action record); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 150; Chinese Acupuncture & Moxibustion, p. 152; cross-referenced against multiple online sources.

What is ST-28 Shui Dao used for?

ST-28 is used for two closely related groups of complaints: urinary conditions in which water will not pass, and gynaecological conditions of the lower abdomen. The indications carried in Sacred Lotus sources & references are set out below. They describe traditional use, not proven treatment.

• Retention of urine
• Difficult, scanty or painful urination
• Lower abdominal distension and fullness
• Oedema and fluid swelling
• Dysmenorrhoea — painful periods
• Irregular menstruation
• Infertility
• Hernia and the classical shan disorders of the lower abdomen
• Pain and dragging sensations in the lower abdomen
• Constipation

How the two groups connect. They are not two separate repertoires but one, seen from either end. The classical physiology places the bladder and the womb in the same space — the lower burner — and describes fluid, blood and qi as circulating there together, so a blockage in one is expected to show in the other. That is why a point recorded for retention of urine is also recorded for period pain, and why the modern research on this point, thin as it is, has landed on both postpartum urinary retention and dysmenorrhoea. It is also why the safety considerations set out under needling apply to the whole group regardless of which complaint brought a person in.

Source: Sacred Lotus sources & references (existing indication record); Chinese Acupuncture & Moxibustion, p. 152; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 150; cross-referenced against multiple online sources.

Where is ST-28 Shui Dao, and how is it used in practice?

Shui Dao lies on the lower abdomen, two cun out to the side of the midline and three cun below the navel — level with Guan Yuan REN-04 on the midline, and roughly halfway between the navel and the pubic bone. Sacred Lotus sources & references hold two location records for it, one measuring across from REN-04 and one measuring down from the umbilicus and out from the midline; they describe the same site from two directions and neither has been altered here. Practically, it is found by locating the midline point first and measuring out.

Which points is ST-28 combined with?

• With REN-04 Guan Yuan — the midline point at the same level, two cun away, and ST-28's most natural partner. REN-04 is the Front-Mu point of the Small Intestine and one of the great tonifying points of the lower abdomen; ST-28 flanks it on either side, and the three together form the standard transverse line for the lower burner.
• With REN-03 Zhong Ji — the Front-Mu point of the Bladder, one level lower on the midline. Where the complaint is urinary, this is the point ST-28 is most often joined to, and the pairing is why the bladder caution recorded at REN-03 applies to the whole row.
• With ST-29 Gui Lai — its own channel neighbour immediately below, level with REN-03, and the Stomach channel's principal gynaecological point. ST-28 and ST-29 are frequently used as a vertical pair down the lower abdomen.
• With ST-25 Tian Shu — the Front-Mu point of the Large Intestine on the same channel line, three cun higher beside the navel, added where the bowel is involved as well as the bladder.
• With SP-06 San Yin Jiao — the Meeting Point of the Spleen, Liver and Kidney channels above the inner ankle, and the standard distal partner for anything in the lower burner. Almost every classical prescription that names ST-28 for urinary or menstrual complaints also names SP-06.
• With SP-09 Yin Ling Quan — the He-Sea and Water point of the Spleen below the inner knee, the principal distal point for the movement of fluid, added where oedema or damp accumulation is the picture.
• With BL-28 Pang Guang Shu — the Back-Shu point of the Bladder on the sacrum, used front-and-back with the lower abdominal points in the classical arrangement for urinary retention.
• With BL-54 Zhi Bian — not a combination in the ordinary sense but the far end of a specific modern needling technique, described in the needling record below, in which a long needle is inserted at BL-54 on the buttock and directed forward to reach ST-28's depth. That technique accounts for most of the published research naming this point.

Where does ST-28 sit among the water-named points?

Chinese point names are not decorative, and a shared character marks a shared concern. Sacred Lotus sources & references hold a small family of points whose names are built on shui, water, and reading them together shows how consistently the naming tracks function: ST-28 Shui Dao, "Waterway", on the lower abdomen over the bladder; REN-09 Shui Fen, "Water Divide", on the midline one cun above the navel, the classical point for separating fluids and for oedema; KI-05 Shui Quan, "Water Spring", the Xi-Cleft point of the Kidney channel at the inner ankle; ST-10 Shui Tu, "Water Prominence", on the neck; and DU-26 Shui Gou, "Water Trough", in the groove below the nose. Four of the five sit somewhere on the body's fluid pathway from throat to bladder. It is the kind of internal consistency that makes the point names worth learning rather than merely memorising.

Source: Sacred Lotus sources & references (both location records, and the REN-03, REN-04, REN-09, ST-10, ST-25, ST-29, KI-05, DU-26, SP-06, SP-09, BL-28 and BL-54 records); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 150; Chinese Acupuncture & Moxibustion, p. 152; cross-referenced against multiple online sources.

Where is ST-28 located?

• A Manual of Acupuncture (p. 150): On the lower abdomen, 2 cun lateral to the midline and 3 cun inferior to the umbilicus, level with Guanyuan REN-4.
• Chinese Acupuncture and Moxibustion (p. 152): 3 cun below the umbilicus, 2 cun lateral to Guanyuan (REN-4).

How is ST-28 Shui Dao needled, and what cautions are recorded?

Reference fact: ST-28 is a lower-abdominal point lying over the bladder and, in pregnancy, over the enlarging uterus, and the cautions the literature attaches to it are the lower-abdominal cautions — pregnancy, and depth in relation to the abdominal wall and the organs behind it. Sacred Lotus sources & references record perpendicular insertion of 0.7 to 1.2 inches with moxibustion applicable. Everything below records what the textbooks and published anatomical studies document. It is not instruction, and this page does not teach technique.

The angle and depth the texts record

• Sacred Lotus sources & references record perpendicular insertion of 0.7 to 1.2 inches, with moxibustion applicable.
• Chinese Acupuncture & Moxibustion (p. 152) and Deadman & Al-Khafaji (p. 150) record perpendicular insertion in a comparable range at the same site, with moxibustion applicable. Oblique insertion directed downward toward the pubic region is also described in the reference literature where the intention is the genito-urinary organs.
• What lies beneath. ST-28 sits over the belly of the rectus abdominis muscle, in the territory of the inferior epigastric vessels, which run upward inside the rectus sheath roughly along this line. Bruising is the ordinarily documented occurrence at abdominal points on this line. Behind the abdominal wall at this level lie the small intestine, the bladder when full, and in pregnancy the enlarging uterus.
• Moxibustion is documented as applicable and is prominent at this point — the one point-specific clinical trial of ST-28 described below used massage, herbal application and moxibustion rather than needling.

Pregnancy — and a gap in our own record, stated openly

The needling record held here for ST-28 carries no pregnancy caution, while the record for Guan Yuan REN-04 — the point at the same level on the midline, two cun away — falls inside an explicit caution covering the Conception Vessel points from Qu Gu REN-02 up to Shang Wan REN-13. This is the same inconsistency already flagged on the ST-29 Gui Lai record in this library, where the identical gap exists against Zhong Ji REN-03 one level lower, and the position taken here is the same one: it is an inconsistency in how the caution has been recorded across neighbouring points, not a statement that ST-28 is safer than the midline points beside it, and it is flagged rather than quietly harmonised. The standard reference literature treats the lower abdomen as a region requiring caution or avoidance in pregnancy as a whole. A reader should take the caution recorded at REN-03 and REN-04 as applying to this level of the abdomen generally, ST-28 included.

It is worth recording alongside the prohibition that the modern evidence for actual harm at the traditionally forbidden points is weak. A review of the scientific literature on those points found no objective evidence of harm across 15 clinical trials (823 women and several thousand treatments at one or more forbidden points), a cohort of 5,885 pregnant women, and animal work, with rates of preterm birth, miscarriage and stillbirth comparable to untreated controls (Carr DJ, Acupunct Med 2015;33(5):413–9, PMID 26362792). A later narrative review of randomised trials reached a similar conclusion about reported adverse outcomes (Med Acupunct 2019;31(6):346–360, PMID 31871522). The position stated on the Conception Vessel records in this library applies equally here: the traditional caution is long-standing and near-universal in the texts, the controlled evidence has not borne out the specific harm, and practitioners overwhelmingly continue to observe it.

Depth over the lower abdomen, stated as measured fact

• The bladder. The reference literature records that the lower abdominal points are used with the bladder empty. The reason is anatomical rather than traditional: an empty bladder sits inside the bony pelvis where a needle in the abdominal wall cannot reach it, but as it fills it rises out of the pelvis and comes to lie directly behind the anterior abdominal wall — at and above the level ST-28 occupies. That caution is stated most pointedly at REN-03, one level lower on the midline, and it applies to the whole row, this point included.
• Recorded depth at abdominal points is not a constant. Studies measuring the distance from skin to underlying structures at abdominal acupoints found that the depth at which a therapeutic effect is sought can approach the depth at which underlying structures are reached, and that the margin narrows in overweight subjects and in older children (Complement Ther Med 2008;16(6):331–5, PMID 19028333; J Altern Complement Med 2009;15(9):1033–7, PMID 19715462).
• No single agreed safe depth exists for any point. Two systematic reviews of the safe-needling-depth literature — 33 studies in one, 47 in the other, measured by MRI, CT, ultrasound and cadaveric dissection — concluded that measured depths for the same point differ greatly between subject groups and measuring methods, and that "safe depth" has never been standardised (J Altern Complement Med 2011;17(3):199–206, PMID 21417806; Evid Based Complement Alternat Med 2013;2013:740508, PMID 23935678).
• Risk in proportion. A meta-analysis of prospective clinical studies estimated serious acupuncture-related adverse events at approximately 1 per 10,000 patients, with about half of all recorded events being bleeding, pain or flare at the needle site (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268).

A separate technique that must not be confused with needling ST-28

Most of the published research naming Shui Dao does not describe a needle inserted at ST-28 at all. It describes a distinct modern technique known as "Zhibian through Shuidao" — Zhi Bian tou Shui Dao — in which a long needle is inserted at BL-54 Zhi Bian on the buttock and directed forward through the pelvis until the sensation reaches the region of ST-28 on the front of the lower abdomen. One trial specifies the parameters exactly: elongated needles 175 mm in length, inserted at BL-54 at an angle of 20 degrees to the sagittal plane, to an insertion depth of 100 to 115 mm (Zhongguo Zhen Jiu 2015;35(5):461–4, PMID 26255520). That is roughly four inches, and it bears no relation to the 0.7 to 1.2 inches the standard texts record at ST-28 itself. The two must be held apart. The technique is a specialist hospital procedure performed from the buttock, its history and disease range have been reviewed in their own right (Zhongguo Zhen Jiu 2024;44(2):200–3, PMID 38373767), and nothing about it licenses deep insertion at the abdominal point. It is described here so that a reader comparing the research literature with the textbooks is not left with two irreconcilable depth figures.

Standard clean-needle practice applies. Acupuncture and moxibustion are carried out only by a qualified, licensed practitioner; this record documents the literature and is not a technique guide.

Source: Sacred Lotus sources & references (existing needling record, and the REN-02 to REN-13 pregnancy caution recorded on the neighbouring midline points, together with the discrepancy flag already raised on the ST-29 record); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 150; Chinese Acupuncture & Moxibustion, p. 152; PubMed PMID 26362792; 31871522; 19028333; 19715462; 21417806; 23935678; 34489268; 26255520; 38373767 — each verified resolvable and checked for retraction status before citation.

What does the name Shui Dao mean?

Shui Dao means "Waterway" or "Water Passage" — shui, water, and dao, a road, path or channel. Unlike the topographical names that describe a hollow or a hill, this one is functional: it states what the point is understood to do. The phrase is not invented for the point. Shui dao is a term of art in the classical physiology, where it names the passages through which fluid travels and is discharged from the body. The Huangdi Neijing assigns responsibility for those passages to the Sanjiao (Triple Burner), describing it as the official in charge of ditches and waterways, from which the water passages issue — and it is the lower burner, the region ST-28 sits over, that is described as draining them into the bladder. A point on the lower abdomen called "Waterway" is therefore named after a specific piece of theory, and its recorded actions follow that theory exactly.

The name is also rendered "Water Path", "Water Course" and "Water Way"; all describe the same idea. Sacred Lotus sources & references hold four other points built on the same character — REN-09 Shui Fen "Water Divide", KI-05 Shui Quan "Water Spring", ST-10 Shui Tu "Water Prominence" and DU-26 Shui Gou "Water Trough" — and the group is set out under practical use above.

Why does ST-28 carry no point category?

Sacred Lotus sources & references record no five-shu, Source, Connecting, Xi-Cleft, Back-Shu, Front-Mu or Confluent classification for ST-28, and that absence is itself informative. The classification systems are concentrated at particular places on the body: the five-shu points are all below the elbow and knee; the Source, Connecting and Xi-Cleft points cluster on the limbs; the Back-Shu points run down the back beside the spine; the Front-Mu points sit on the front of the trunk over their own organs. ST-28 falls into none of those groups — it is a trunk point that is not a Front-Mu point, which is the commonest situation for a trunk point to be in. Of the Stomach channel's abdominal points, only ST-25 Tian Shu carries a Front-Mu classification (of the Large Intestine) and only ST-30 Qi Chong carries a Meeting-Point classification (with the Penetrating Vessel); the rest, ST-28 among them, are local points on a channel. They are chosen by where they are and what the texts record them for, and that is a perfectly ordinary way for a point to earn its place.

Is there research on ST-28 Shui Dao?

There is a substantial research literature naming Shuidao, but almost all of it concerns the "Zhibian through Shuidao" needling technique performed from the buttock rather than needling at ST-28 itself. Exactly one published trial tests treatment applied at ST-28 directly. That distinction matters and is kept throughout.

• The one point-specific trial. One hundred and twenty women with postpartum urinary retention were randomised to three escalating treatments applied at bilateral ST-28: rapid acupoint massage alone; massage plus a herbal acupoint application; or massage, application and moxibustion together. All groups also received standard postpartum care. The triple-treatment group had significantly lower residual bladder volume, earlier first urination, greater first and five-hour urine volumes and better satisfaction than the other two, with total effective rates of 100 per cent, 90 per cent and 70 per cent respectively (Zhongguo Zhen Jiu 2024;44(7):803–6, PMID 38986594). This is genuine point-level work on ST-28's leading classical indication, retention of urine. It is also unblinded, single-centre, has no sham arm, uses a soft "effective rate" outcome, and compares three active treatments rather than treatment against no treatment — so it shows that more stimulation at ST-28 produced more effect, not that ST-28 was responsible.
• Dysmenorrhoea, via the penetrating technique. Sixty-two women with primary dysmenorrhoea were randomised to the long-needle Zhibian-through-Shuidao technique or to ibuprofen, over three menstrual cycles. The acupuncture arm reported significantly lower pain intensity and symptom severity and a higher responder rate, with no serious adverse events (Pain Res Manag 2019;2019:7978180, PMID 31929849, PMC6935824). A small unblinded trial comparing a hands-on procedure with a tablet — which cannot be blinded — and testing a technique rather than the point.
• Gynaecological and urinary trials of the same technique. The Zhibian-through-Shuidao method has been trialled for polycystic ovary syndrome (101 patients, PMID 26255520), for female stress urinary incontinence (PMID 33068346), for urinary retention after spinal cord injury (PMID 30957445), and as a protocol for postoperative pain (J Pain Res 2025;18:2163–74, PMID 40297489). Its origins, development and claimed disease range have been reviewed separately (PMID 38373767). Taken together these establish that the technique has a real clinical following in China; none of them isolates the contribution of ST-28.
• Animal mechanism work. Rat models of premature ovarian insufficiency have used the same Zhibian-to-Shuidao insertion, reporting effects on apoptosis-related and Fas/FADD signalling in ovarian tissue (PMID 37068824; PMID 37161807) and on the serum metabolome (J Tradit Chin Med 2024;44(4):722–33, PMID 39066533). Laboratory work in animals using a two-point technique; it does not transfer to human practice.

The fair summary is that ST-28's urinary indication has one small unblinded point-specific trial behind it, that its gynaecological indication has been studied only through a penetrating technique that reaches the point from the buttock, and that no study isolates the point. The site does not claim that ST-28 treats urinary retention, period pain, infertility or oedema.

How does ST-28 compare with the points around it?

The Stomach channel's abdominal line is easiest to hold as a descending sequence. ST-25 Tian Shu, level with the navel, is the Front-Mu point of the Large Intestine and the great point of the line — a bowel point with a wide systemic repertoire that ST-28 does not share. ST-26 Wai Ling and ST-27 Da Ju lie between them and are local points of the lower abdomen. ST-28 Shui Dao, level with REN-04, is the water and bladder point of the group. ST-29 Gui Lai, one cun lower and level with REN-03, is the Stomach channel's principal gynaecological point — its name means "Return", in the sense of what has gone astray coming back, and where ST-28 leans urinary, ST-29 leans menstrual and obstetric. ST-30 Qi Chong, lower again at the groin, is the Meeting Point of the Stomach channel with the Penetrating Vessel. Across the midline, REN-04 Guan Yuan at ST-28's own level and REN-03 Zhong Ji below it are the Front-Mu points of the Small Intestine and the Bladder respectively, and they carry the pregnancy and bladder cautions in their most explicit form. All of these are held in Sacred Lotus sources & references.

Source: Sacred Lotus sources & references (name, both location records, the absence of any category classification confirmed by direct query, and the ST-25, ST-26, ST-27, ST-29, ST-30, ST-10, REN-03, REN-04, REN-09, KI-05, DU-26 and BL-54 records); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 150; Chinese Acupuncture & Moxibustion, p. 152; Huangdi Neijing Su Wen on the Sanjiao and the water passages; PubMed PMID 38986594, 31929849 (PMC6935824), 26255520, 33068346, 30957445, 40297489, 38373767, 37068824, 37161807, 39066533 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.