REN-04 (Guan Yuan) Origin Pass

What does REN-04 Guan Yuan do?

Guan Yuan REN-04 is the principal point of Chinese medicine for the original qi — the constitutional reserve the tradition calls yuan qi — and one of the two or three greatest tonification and moxibustion points on the body. Sacred Lotus sources & references classify it two ways at once: it is the Front-Mu (alarm) point of the Small Intestine, and it is a Meeting Point of the Conception Vessel with the Spleen, Liver and Kidney channels — the three leg yin channels converging on a single midline point three cun below the navel.

• Fortifies the original qi and benefits the essence — the action the point is named for. REN-04 sits over the region the classics call the dan tian, the field where original qi is stored, and it is the point reached for when the reserve itself is depleted rather than any one organ.
• Tonifies and nourishes the Kidneys — for the Kidney-deficiency picture in both its forms: cold, exhaustion and impotence where yang is weak; heat, night sweats and seminal loss where yin is weak.
• Warms and fortifies the Spleen — the Spleen channel is one of the three that meet here, which is why a lower-abdominal point is recorded for chronic diarrhoea, indigestion and prolapse.
• Benefits the uterus and assists conception — the recorded action behind its long use in irregular menstruation, painful periods, discharge and infertility. The Liver and Kidney channels meeting here are the two most closely tied to the uterus in channel theory.
• Regulates the lower burner and benefits the Bladder — for urinary frequency, urgency, retention, dribbling and bed-wetting, and for the dragging lower abdominal pain of the lower burner.
• Regulates Small Intestine qi — the Front-Mu action proper. The Small Intestine in Chinese medicine separates the clear from the turbid, and REN-04 is where its qi is said to gather on the front of the body.
• Restores collapse and rescues yang — the emergency action. In the classical descriptions of devastated yang — cold limbs, a fading pulse, the flaccid type of windstroke — REN-04 is one of the small group of points treated with sustained moxibustion.

Source: Sacred Lotus sources & references (channel, Front-Mu and meeting-point classifications, existing action record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 501); Chinese Acupuncture & Moxibustion (p. 237); cross-referenced against multiple online sources.

What is REN-04 Guan Yuan used for?

Guan Yuan REN-04 is used above all for deficiency and cold of the lower burner — urinary, reproductive and menstrual complaints, and profound exhaustion. The indications below are those carried in Sacred Lotus sources & references and set out in the standard reference literature. They describe traditional use, not proven treatment, and this point carries a pregnancy caution set out under needling.

• Bed-wetting (enuresis) and frequent urination
• Retention of urine and difficult, dribbling urination
• Nocturnal emission, impotence and seminal loss
• Irregular menstruation
• Painful periods (dysmenorrhoea)
• Uterine bleeding and flooding
• Excessive vaginal discharge (morbid leukorrhoea)
• Postpartum haemorrhage and postpartum urinary retention
• Infertility and the failure of conception attributed to a cold, deficient uterus
• Lower abdominal pain, coldness and dragging heaviness
• Hernia and the classical shan disorders of the lower abdomen
• Indigestion and chronic diarrhoea
• Prolapse of the rectum
• The flaccid type of windstroke (apoplexy) with collapse and cold limbs
• Exhaustion, weakness and depletion of the constitutional reserve

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 501); Chinese Acupuncture & Moxibustion (p. 237).

Where is REN-04 Guan Yuan, and how is it used in practice?

Guan Yuan lies on the midline of the lower abdomen, three cun below the navel — roughly two-thirds of the way down from the navel to the pubic bone, and two cun above the pubic symphysis itself. It is the fourth point of the Conception Vessel counting up from the pubic bone, and it sits in the middle of a short run of midline points that between them cover the whole lower burner. In practice it is used in two quite different ways: as a slow, warming tonification point treated with moxibustion over many sessions, and as an emergency point for collapse.

Which points is REN-04 combined with?

• The Shu-Mu combination — REN-04, the Front-Mu point of the Small Intestine, paired with Xiao Chang Shu BL-27, the Back-Shu point of the same organ. Front and back, one organ, the oldest structured pairing in the medicine.
• With San Yin Jiao SP-06 — the standard gynaecological pairing. SP-06 is itself a meeting of the Spleen, Liver and Kidney channels, so the two points repeat the same three-channel convergence, one on the abdomen and one on the leg.
• With Qi Hai REN-06 and Shen Que REN-08 — the classical moxibustion group of the lower abdomen. REN-06 (Sea of Qi) lies one and a half cun below the navel and REN-08 is the navel itself; the three are warmed together for deficiency, cold and collapse.
• With Ming Men DU-04 and Shen Shu BL-23 — front and back of the Kidneys and the original qi. REN-04 on the abdomen and DU-04 on the lumbar spine are the classical front-and-back moxibustion pair, and this pairing is the one most often carried into experimental work.
• With Zu San Li ST-36 — the general tonification pairing, adding the middle burner to the lower. This combination has been examined directly under functional MRI and in heart-rate-variability studies (see the research section).
• For urinary complaints — with Zhong Ji REN-03, the Front-Mu point of the Bladder, one cun below REN-04, and with the sacral points Ci Liao BL-32.
• For menstrual and uterine complaints — with REN-03, SP-06 and Gui Lai ST-29 either side of the midline.
• Method — moxibustion is recorded as applicable and is the method most associated with this point. Sacred Lotus sources & references state plainly that REN-04 is one of the important points for tonification, and warming techniques including moxa cones, moxa boxes and salt- or ginger-partitioned moxa over the lower abdomen are widely recorded for cold and deficiency patterns.

Where does REN-04 sit among the Front-Mu points?

The Front-Mu or alarm points are the twelve places on the chest and abdomen where each organ's qi is held to collect. Sacred Lotus sources & references carry the full set: LU-01 Zhong Fu for the Lungs, REN-17 Shan Zhong for the Pericardium, REN-14 Ju Que for the Heart, REN-12 Zhong Wan for the Stomach, LIV-14 Qi Men for the Liver, LIV-13 Zhang Men for the Spleen, GB-24 Ri Yue for the Gall Bladder, GB-25 Jing Men for the Kidneys, REN-05 Shi Men for the San Jiao, ST-25 Tian Shu for the Large Intestine, REN-03 Zhong Ji for the Bladder — and REN-04 Guan Yuan for the Small Intestine. Four of the twelve sit on the Conception Vessel in a single short run: REN-03, REN-04, REN-05 and REN-12. Note the mismatch that catches most students: REN-04 collects the qi of the Small Intestine, an organ whose own channel runs along the arm and up the side of the neck and never touches the lower abdomen. Front-Mu points are assigned by anatomy, not by channel.

Source: Sacred Lotus sources & references (location, categories, full Front-Mu set); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 501); Chinese Acupuncture & Moxibustion (p. 237); cross-referenced against multiple online sources.

Where is REN-04 located?

• A Manual of Acupuncture (p. 501): On the midline of the lower abdomen, 3 cun inferior to the umbilicus and 2 cun superior to the pubic symphysis.
• Chinese Acupuncture and Moxibustion (p. 237): On the anterior midline, 3 cun below the umbilicus.

How is REN-04 Guan Yuan needled, and what cautions are recorded?

One safety fact belongs at the front. REN-04 is a lower-abdominal point of the Conception Vessel and it is classically contraindicated in pregnancy. Sacred Lotus sources & references carry that caution explicitly in their own needling record, stating that great care must be taken with the Conception Vessel points from Qu Gu REN-02 up to Shang Wan REN-13 in pregnant women — a range in which REN-04 sits close to the middle, directly over the uterus. Everything below is recorded as neutral reference data describing what the textbooks and the published anatomical studies state. 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 0.8 to 1.2 inches, with moxibustion applicable, and note that this is one of the important points for tonification.
• Chinese Acupuncture & Moxibustion (p. 237) and Deadman & Al-Khafaji (p. 501) both record perpendicular insertion on the midline, through the linea alba, with moxibustion strongly indicated, and both texts attach the pregnancy caution.
• Moxibustion is recorded as applicable and is the method most closely identified with this point; it is frequently treated without needling at all.

The bladder consideration, stated as anatomy

The empty bladder sits inside the bony pelvis, below and behind the pubic symphysis, where a needle on the abdominal wall cannot reach it. A full bladder does not stay there: as it fills it rises out of the pelvis and lies directly against the anterior abdominal wall above the pubic bone — which is precisely the territory of REN-03, REN-04 and their neighbours. This is why the standard reference texts record that the bladder should be emptied before the lower abdominal midline points are used, and it is an anatomical fact rather than a matter of tradition.

• Depth at abdominal points is not a constant. Studies measuring the distance from skin to the 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 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).
• There is no single agreed safe depth for any point. Two systematic reviews of the safe-needling-depth literature — 33 studies in the first, 47 in the second, measured variously by MRI, CT, ultrasound and cadaveric dissection — both concluded that depths measured for the same point differ greatly between subject groups and between measuring methods, and that the definition of "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). A textbook figure is a central estimate, not a guarantee.
• Documented abdominal injury. Injury to abdominal organs from acupuncture needles appears in the published case literature, including a fatal case of multiple organ injuries attributed to improper practice (Forensic Sci Med Pathol 2026;22(2):463–468, PMID 41582237). We found no published case report of bladder puncture at REN-04 specifically; the only bladder-related report located was a bladder stone that had formed around a fragment of a needle retained in the back twenty years earlier and subsequently migrated — a retained-needle event, not a needling-depth one (Hinyokika Kiyo 2008;54(5):365–7, PMID 18546863). That distinction is worth stating rather than blurring.
• Risk in proportion. A meta-analysis of prospective clinical studies estimated serious 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).

The pregnancy contraindication

REN-04 belongs to the group of points the classical literature forbids during pregnancy, together with the other lower-abdominal and sacral points and with the distal points recorded as expediting delivery. The reason given in the texts is direct: the point lies over the uterus and its recorded actions bear on the uterus. It is worth recording alongside the prohibition that the modern evidence for actual harm is weak. A review of the scientific literature on the so-called forbidden 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 honest position is that the traditional prohibition is long-standing and near-universal in the texts, that our own record carries it, and that the controlled evidence has not confirmed the harm it anticipates — and that most practitioners continue to observe it.

A point of historical interest about depth

Recorded as fact rather than recommendation: a Chinese clinical study of 132 patients with urinary retention compared deep oblique insertion at Guanyuan with a 75 mm needle against ordinary perpendicular insertion with a 40 mm needle, reporting total effective rates of 80.8 per cent against 57.4 per cent (Zhongguo Zhen Jiu 2013;33(12):1071–5, PMID 24617228). That is a specialist hospital technique using a needle roughly twice the length implied by the general reference figures, and it is noted here because a reader comparing the trial with the textbooks will otherwise find the two irreconcilable.

Source: Sacred Lotus sources & references (existing needling record, including the pregnancy caution covering REN-02 to REN-13); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 501); Chinese Acupuncture & Moxibustion (p. 237); PMID 19028333; PMID 19715462; PMID 21417806; PMID 23935678; PMID 41582237; PMID 18546863; PMID 34489268; PMID 26362792; PMID 31871522 — each record checked as active and not retracted.

What does the name Guan Yuan mean?

Guan Yuan means "Origin Pass" — guan, a gate, barrier or mountain pass, and yuan, the origin or source. The yuan in the name is the same yuan as in yuan qi, the original or constitutional qi, and the name says exactly what the tradition claims for the point: it is the gateway to the body's original reserve. The region it lies over is the lower dan tian, the "cinnabar field" of the internal arts, which is why this point recurs in qigong and meditation instruction as often as it does in acupuncture texts. The classical literature records an unusually long list of alternative names for this point — a distinction that by itself indicates how heavily it was used.

Why does it matter that REN-04 is a Front-Mu point and a meeting point of three channels?

These are two separate classifications and they account for two different halves of the point's use.

• Front-Mu (alarm) point of the Small Intestine. Front-Mu points are where an organ's qi is said to gather on the front of the trunk. They are diagnostically sensitive — tenderness on pressure at REN-04 is read as a sign referring to its organ — and therapeutically direct. Pairing a Front-Mu point with the matching Back-Shu point, here Xiao Chang Shu BL-27, is the classical Shu-Mu combination.
• Meeting Point of the Conception Vessel with the Spleen, Liver and Kidney channels. This is the classification that explains the gynaecology. The three leg yin channels all traverse the lower abdomen and all three converge on this point, so a single needle reaches the Spleen (which holds blood in the vessels), the Liver (which stores blood) and the Kidneys (which govern reproduction and the essence). Sacred Lotus sources & references record the same three-channel convergence at Zhong Ji REN-03 and at San Yin Jiao SP-06 on the leg — which is why those two are REN-04's most frequent partners.

Is there research on REN-04 Guan Yuan?

REN-04 is one of the more heavily studied individual points, but the literature is dominated by animal work and by small single-centre Chinese trials; there is no large, well-powered randomised trial isolating this point for any indication. The studies below name Guanyuan CV4 as a studied point rather than burying it in a long protocol:

• Low back pain, clinical. A randomised controlled trial assigned 40 participants to moxibustion at Guanyuan CV4 for 15, 30 or 60 minutes, or to conventional needling as control. Pain and disability scores fell in all four groups; the 60-minute group showed the largest reduction and was significantly better than the control and the shorter-duration groups (J Tradit Chin Med 2015;35(1):36–40, PMID 25842726). A 40-participant, four-arm dose-finding study is hypothesis-generating, but it is genuinely about this point and about the parameter — heating time — that matters most for it.
• Urinary retention, clinical. The 132-patient depth-comparison study described under needling is also the largest point-specific clinical study located for REN-04, reporting the best results in postpartum urinary retention (PMID 24617228). It was not blinded and used no sham control.
• Autonomic effect, clinical. A randomised study in 90 patients with a qi-deficiency pattern compared a single session of needling at CV4 and ST-36, moxibustion at the same two points, and no intervention, measuring heart-rate variability before, during and after treatment. Symptom scores fell in both treated groups, and the shifts in average heart rate and in the low-to-high-frequency ratio were larger after needling than after moxibustion (Zhongguo Zhen Jiu 2020;40(10):1047–51, PMID 33068344).
• Brain effect, imaging. A functional MRI study in 21 healthy volunteers compared electroacupuncture at CV4 with electroacupuncture at ST-36. Both produced similar deactivation in the anterior cingulate and medial prefrontal cortices and similar modulation of the resting-state network, with slightly stronger signals at ST-36 (Zhen Ci Yan Jiu 2012;37(1):46–52, PMID 22574569).
• Mechanism, preclinical. Electroacupuncture at CV4 reduced pain behaviour, uterine tissue damage, sympathetic activity and a panel of inflammatory mediators in a rat model of pelvic inflammatory disease (Immun Inflamm Dis 2025;13(11):e70299, PMID 41194515); stimulation of the Guanyuan point improved ovarian outcomes in a mouse model of premature ovarian insufficiency (Mol Immunol 2026;190:34–44, PMID 41506005); and moxibustion at CV4 altered extragonadal oestrogen and oestrogen-receptor expression in ovariectomised rats (Zhongguo Zhen Jiu 2025;45(12):1770–1776, PMID 41397727). This body of animal work is consistent in pointing at the reproductive axis, which is where the traditional indications also sit.
• Painful periods. A randomised trial in primary dysmenorrhoea used moxibustion at Shen Que REN-08 together with warm-needle moxibustion at Guanyuan CV4 and San Yin Jiao SP-06 (Zhongguo Zhen Jiu 2019;39(4):367–70, PMID 30957446). Three points were treated together, so the result belongs to the combination rather than to REN-04 alone — but it is the combination this page describes.

One citation was deliberately dropped. A 2022 randomised trial reporting that electroacupuncture at ST-36, CV4 and CV6 regulated immune function in sepsis patients has been retracted by the publisher (retraction notice, Biomed Res Int 2024;2024:9832793, PMID 38550204). It is named here only so that readers who encounter it elsewhere know its status; it is not used as evidence on this page.

How does Guan Yuan compare with the points around it?

Zhong Ji REN-03, one cun below, is the Front-Mu point of the Bladder and is the more specifically urinary of the two; it shares REN-04's three-channel meeting. Shi Men REN-05, one cun above, is the Front-Mu point of the San Jiao and carries a classical reputation — recorded in the texts and much argued over — for causing infertility, which is why REN-04 and REN-06 are generally preferred around it. Qi Hai REN-06, one and a half cun below the navel, is the "Sea of Qi" and is weighted toward qi and the yang, where REN-04 is weighted toward the essence, the blood and the yin as well; the two are constantly used together and are the closest thing the Conception Vessel has to a matched pair. Shen Que REN-08 is the navel itself, used with moxa and never needled. Further up, Zhong Wan REN-12 governs the middle burner as REN-04 governs the lower. Among all of these REN-04 is the deep-reserve point — the one chosen when the problem is not an organ misbehaving but the constitution running short.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture (p. 501); Chinese Acupuncture & Moxibustion (p. 237); Sacred Lotus sources & references; PMID 25842726; PMID 24617228; PMID 33068344; PMID 22574569; PMID 41194515; PMID 41506005; PMID 41397727; PMID 30957446 — each checked as active and not retracted; PMID 38550204 cited only as a retraction notice; cross-referenced against multiple online sources.