REN-09 (Shui Fen) Water Divide

What does REN-09 Shui Fen do?

REN-09 regulates the water passages and treats edema, and harmonises the intestines and dispels accumulation — the Conception vessel’s principal point for fluid, its name meaning “Water Divide”.

• Regulates the water passages and treats edema — the fluid action this point is best known for; a classical point for generalised swelling and fluid retention
• Harmonises the intestines and dispels accumulation — the bowel action, for abdominal pain, rumbling and diarrhoea

The name explains the point. “Shui Fen” means Water Divide or Water Separation — and it sits, classically, over the place where the small intestine separates the clear from the turbid (the “clear” fluids reabsorbed, the “turbid” passed on). That physiology is the whole idea behind its water action: a point that governs the dividing of fluids treats their failure — edema when fluid is retained, urinary difficulty when it will not pass, diarrhoea when the separation goes wrong. Few points marry name, position and action so tightly.

The edema point of the lower midline. Among the Conception-vessel abdominal points, REN-09 is the one reached for edema above all, often with moxa. It sits one cun above the navel, over the small intestine, and works with the fluid points of the Spleen and Kidney channels.

On the name. “Shui Fen” — Water Divide, the separating of the body’s fluids, as noted above.

Source: Sacred Lotus sources & references (channel, action, location and translation records; the neighbouring Conception-vessel points queried against our own data), cross-referenced against multiple online sources.

What is REN-09 Shui Fen used for?

REN-09 is used for edema, abdominal pain and rumbling, retention of urine, and diarrhoea. Our own indication record is reproduced here in full.

• Edema (fluid swelling)
• Abdominal pain
• Borborygmus (abdominal rumbling)
• Retention of urine
• Diarrhoea

Fluid and the bowel — the two actions exactly. Edema and urinary retention are the water-passages action; abdominal pain, rumbling and diarrhoea are the intestine-harmonising action. All five entries turn on the movement and separation of fluid, which is the point’s theme.

An honest note. Edema requires medical assessment — cardiac, renal, hepatic and venous disease are among the causes, and generalised swelling of new onset warrants prompt care. Retention of urine is a medical emergency. Persistent diarrhoea causes dehydration and can signal disease needing diagnosis. This record documents classical use only.

How it is combined. With SP-09 Yin Ling Quan and KI-07 Fu Liu for edema and fluid, ST-25 Tian Shu for the bowel, and REN-06 Qi Hai nearby. Classically often treated with moxa for edema. All held here.

Source: Sacred Lotus sources & references (indication and action records; the KI-07, REN-06, SP-09 and ST-25 records queried from our own data), cross-referenced against multiple online sources.

Where is REN-09 Shui Fen located?

REN-09 is on the midline of the upper abdomen, one cun above the navel.

• On the anterior midline
• 1 cun above the umbilicus (navel)
• Just above REN-08 Shen Que (at the navel) and below REN-10 Xia Wan (2 cun above)

One cun above the navel. The navel (REN-08) is the fixed landmark; REN-09 sits one cun above it on the midline. The upper-midline points climb from the navel toward the breastbone by measurement. Its position over the small intestine is what ties it to the “water divide” physiology.

On the name. “Shui Fen” — Water Divide, as noted above.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged; the REN-08 and REN-10 records queried from our own data).

• A Manual of Acupuncture (p. 508): On the midline of the abdomen, 1 cun above the umbilicus and 7 cun below the sternocostal angle.
• Chinese Acupuncture and Moxibustion (p. 238): On the anterior midline, 1 cun above the umbilicus.

How is REN-09 Shui Fen needled, and what cautions apply?

Our own record states perpendicular insertion of 0.5–1.0 inch, with moxibustion applicable — and it carries an explicit pregnancy caution. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: perpendicular, 0.5–1.0 inch.
• Moxibustion: recorded as applicable — and moxa is the classical method of choice here for edema.
• Pregnancy caution (recorded verbatim): “great care should be taken to puncture the points from Qugu (REN-02) to Shangwan (REN-13) in pregnant women” — REN-09 lies within that run.
• A note for ascites: where edema includes ascites (fluid in the abdominal cavity), the abdominal wall and organs are altered, and deep needling of the abdomen is approached with particular caution — a reason moxa is often preferred here.
• Regional anatomy: the point overlies the upper abdominal wall on the midline; the small intestine lies deep, and in pregnancy the uterus rises into the region.

Hazard, stated plainly. The consideration is the organs beneath — bowel, and the uterus in pregnancy. Our record carries no arterial caution at REN-09, and it is not among the nine points that do. A practitioner’s point, not one for self-treatment.

What is not claimed. No study measuring a safe depth at REN-09 could be located, and none is borrowed; the pregnancy and ascites cautions stand in its place. No case report naming REN-09 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged including the pregnancy caution; the nine arterial cautions queried from our own data), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on REN-09, and what should a reader know?

No trial isolates REN-09. Where the point appears it is one component of an edema or digestive protocol, and a study that includes a point in a protocol is not evidence about that point.

What this page can state with confidence. REN-09 Shui Fen (“Water Divide”) is the Conception vessel’s principal fluid point — it regulates the water passages, treats edema, and harmonises the intestines. Its name, position (over the small intestine, where the clear is separated from the turbid), and action all agree. It sits 1 cun above the navel, is often treated with moxa for edema, and carries the recorded pregnancy caution.

A safety note. Edema and urinary retention are matters for medical care; this page records classical use and says so.

A note on searching for it. “REN 9”, “CV 9” and “Shuifen” searches return protocol trials and unrelated material — and this vessel is coded REN, RN, CV and VC across the literature. Any claim attached to this point should be checked against what a study actually used.

Source: Sacred Lotus sources & references (action, indication and location records; the neighbouring Conception-vessel points queried, against our own data).