Dan Nang Xue Gallbladder Point

What does Dan Nang Xue do?

Dan Nang Xue is a modern reflex point on the outer upper calf, found by pressing for tenderness rather than measured out, and everything documented about it concerns the gall bladder and the short stretch of leg it sits in. It belongs to no channel, so it carries no channel-theory action; what the reference literature records is a point that becomes tender when the gall bladder is inflamed and is needled for the disorders that make it tender.

• Used for acute and chronic cholecystitis — the defining documented use and the reason the point was named. It is the indication under which Dan Nang Xue appears in every reference that carries it.
• Used for gallstones (cholelithiasis) and biliary colic — the second major documented application, and the one in which the point has actually reached a controlled trial protocol (PMID 17165496).
• Used for biliary ascariasis — the parasitic obstruction of the bile duct that was common in mid-twentieth-century China and is the historical setting in which this point came into use. It is now rare across most of the world, and the indication survives largely as a record of where the point came from.
• Used for distension and pain below the ribs on the right — the hypochondriac region, which is where gall bladder pain is felt.
• Serves as a tenderness sign as well as a treatment site — the unusual part. The point is located by the tenderness it develops, so palpating it is part of using it. This is a documented reflex phenomenon rather than a diagnostic test, and the caution that belongs with it is set out under needling.
• Used locally for weakness, numbness and wasting of the lower leg — a secondary use it shares with its neighbours on the outer calf, and the only documented use that has nothing to do with the gall bladder.

A correction worth stating plainly. Our earlier record for this point opened by saying it "clears heat and drains damp-heat from the Gallbladder" and closed by saying it "benefits the local channel". Both phrases have been removed. They are organ- and channel-theory language, and Dan Nang Xue lies on no channel at all — it holds no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification, and there is no channel running through it to be benefited. The points that genuinely carry that reasoning for the gall bladder are all held in Sacred Lotus sources & references and were queried directly rather than recalled: GB-24 Ri Yue ("Sun and Moon"), the Front Mu point of the Gallbladder in the seventh intercostal space, where the organ's qi is said to gather on the front of the body; BL-19 Dan Shu ("Gallbladder Shu"), the Back Shu point of the Gallbladder beside the tenth thoracic vertebra, its counterpart on the back; and GB-34 Yang Ling Quan, the He-Sea point of the Gall Bladder channel and the Hui-Meeting Point of the Sinews, which is the channel point immediately above Dan Nang Xue and the one classically reached for in damp-heat, jaundice and bitter-taste patterns. Those three are the theory. Dan Nang Xue is the tender spot below GB-34 that twentieth-century Chinese clinicians noticed and began needling.

Source: Sacred Lotus sources & references (existing action and indication record, corrected as described; the GB-24 Front Mu, BL-19 Back Shu and GB-34 Hui-Meeting classifications queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 584); Chinese Acupuncture & Moxibustion (p. 253); PubMed PMID 17165496; cross-referenced against multiple online sources.

What is Dan Nang Xue used for?

Dan Nang Xue is used for gall bladder disorders — cholecystitis above all — and for little else. The indications carried in Sacred Lotus sources & references are acute and chronic cholecystitis, cholelithiasis, biliary ascariasis, and muscular atrophy and numbness of the lower limb. The wider reference literature adds only closely related presentations of the same organ. These describe traditional and documented clinical use, not proven treatment, and this point carries the caution set out under needling.

• Acute cholecystitis
• Chronic cholecystitis
• Gallstones (cholelithiasis)
• Biliary colic
• Biliary ascariasis
• Distension, fullness and pain of the right hypochondrium — the region below the ribs on the right
• Bitter taste in the mouth and nausea accompanying gall bladder complaints
• Muscular atrophy, weakness and numbness of the lower leg
• Painful obstruction and motor impairment of the lower limb, as a local point

What it is not used for. The reference literature does not record Dan Nang Xue for the head, the chest, the mind, or any presentation away from the gall bladder and the outer lower leg. Where a gall bladder problem is part of a wider pattern, the points that carry that reasoning are on channels — GB-24 Ri Yue and BL-19 Dan Shu as the Front Mu and Back Shu pair, GB-34 Yang Ling Quan as the He-Sea point of the channel, and LIV-03 Tai Chong where the Liver is implicated. All are held here, and Dan Nang Xue is used alongside them rather than in place of them.

Source: Sacred Lotus sources & references (existing indication record; GB-24, BL-19, GB-34 and LIV-03 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 584); Chinese Acupuncture & Moxibustion (p. 253); cross-referenced against multiple online sources.

Where is Dan Nang Xue, and how is it found?

It is on the outer side of the upper calf, a short way below GB-34 Yang Ling Quan — and it is found by pressing, not by measuring. That is the single most distinctive thing about this point. Sacred Lotus sources & references place it between one and two cun distal to Yang Ling Quan GB-34, on the right leg. In our own words: find the small bony head of the fibula on the outer side of the knee, drop into the tender hollow just in front of and below it where GB-34 sits, then move roughly a finger's breadth or two further down the leg and press along that short stretch until the sorest spot is found. That spot is the point.

Why is Dan Nang Xue located by tenderness rather than by measurement?

Because it is a reflex point, and a reflex point does not sit at a fixed distance — it sits where the body reports it. Nearly every point in the repertoire is located by proportional measurement: the body is divided into standard divisions called cun, and a point is specified as so many cun from a named bone, crease or landmark, so that one instruction fits a tall person and a short one. Dan Nang Xue is specified differently. The reference literature gives a range — one to two cun below GB-34 — and then says to palpate within it for the area of maximal tenderness. The range narrows the search; the tenderness settles it.

The difference matters in three practical ways. First, the point genuinely moves between people, and in the same person between one episode and another. Second, if there is no tenderness there is arguably no point to find, which is a claim no proportionally-measured point ever makes about itself. Third, it collapses locating the point and examining the patient into a single act — which is why the older literature treats the tenderness as a sign as well as a target. Only a small handful of points work this way, and Sacred Lotus sources & references hold the closest parallel: Lan Wei Xue, the "Appendix Point", located by exactly the same method roughly two cun below ST-36 Zu San Li, also on the right leg.

Which points is Dan Nang Xue combined with?

• With GB-34 Yang Ling Quan — its immediate neighbour, one to two cun above it, and the standard partner. GB-34 is the He-Sea point of the Gall Bladder channel, the Hui-Meeting Point of the Sinews and one of the Ma Dan-yang Heavenly Star points, and it carries the channel reasoning that Dan Nang Xue does not. The pairing is so routine that some sources treat the two almost as a single treatment site.
• With GB-24 Ri Yue and BL-19 Dan Shu — the Front Mu and Back Shu points of the Gallbladder, held here. Bracketing the organ front and back and adding a distal point on the leg is the conventional shape of a gall bladder prescription.
• With LIV-14 Qi Men, ST-21 Liang Men, BL-18 Gan Shu and GB-34 — the remainder of the seven-point electroacupuncture protocol used in the published gallstone trial described below, alongside Dan Nang Xue itself (PMID 17165496).
• With ST-36 Zu San Li — the general point of the lower leg, added to most abdominal and digestive prescriptions.
• With Lan Wei Xue — not as a co-treatment but as its structural twin. The two are the pair of "organ points" that modern Chinese practice added to the extra-point repertoire: one for the gall bladder below GB-34, one for the appendix below ST-36, both on the right leg, both located by tenderness, both named in plain anatomical language. Reading the two records together is the quickest way to understand either.

Why is Dan Nang Xue described on the right leg only?

Because the gall bladder is on the right. Almost no point in the repertoire is one-sided — points are ordinarily bilateral, needled on both sides or on the affected side. Dan Nang Xue is recorded on the right because it is held to be a reflex of a specific organ sitting on the right side of the abdomen, and the same logic governs Lan Wei Xue, recorded on the right because the appendix is there. That one-sidedness is itself a marker of the point's modern, anatomically-reasoned origin rather than a classical channel derivation, and it is worth noticing for exactly that reason.

Source: Sacred Lotus sources & references (location; existing use record; GB-24, GB-34, BL-18, BL-19, LIV-14, ST-21, ST-36 and Lan Wei Xue records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 584); Chinese Acupuncture & Moxibustion (p. 253); PubMed PMID 17165496; cross-referenced against multiple online sources.

Where is Dan Nang Xue located?

• A Manual of Acupuncture (p. 584): Between 1 and 2 cun distal to Yanglingquan (GB-34) on the right leg.

How is Dan Nang Xue needled in the textbooks?

Reference record only — this sets out what the standard texts document, not instruction for a reader. Sacred Lotus sources & references record perpendicular insertion of 1 to 1.5 cun at Dan Nang Xue. Deadman & Al-Khafaji and Chinese Acupuncture & Moxibustion record comparable perpendicular insertion at this site on the outer upper calf, with moxibustion documented as applicable.

• Angle documented: perpendicular.
• Depth documented: 1 to 1.5 cun — a middling depth for the leg, and well short of the 1.5 to 2.5 inches our record carries for GB-30 Huan Tiao in the buttock.
• Side documented: the right leg, for the reason set out under how the point is used.
• Electroacupuncture: frequency-changing electroacupuncture was applied at this point among seven in the published gallstone trial (PMID 17165496).
• Moxibustion: recorded as applicable in the reference literature.

What are the safety considerations at Dan Nang Xue?

The most important consideration at this point is not anatomical at all. It is that acute cholecystitis, biliary colic and an obstructed bile duct are conditions in which delay carries consequences, and a tender spot on the leg is not a diagnosis. That is recorded here as reference fact because the point's own defining feature invites the mistake. Sacred Lotus sources & references already carry the parallel caution at Lan Wei Xue, where a prospective study of the equivalent tenderness sign for appendicitis found it a comparatively weak indicator — roughly 64 per cent sensitivity and 50 per cent specificity, ranking below established surgical signs. No study of comparable quality has been located for the gall bladder equivalent, so there is no figure to give, and we will not supply one by analogy. The defensible position is that point tenderness may add supporting information within a clinical assessment and cannot substitute for conventional medical diagnosis and imaging. Suspected acute cholecystitis, obstructive jaundice and biliary obstruction are matters for urgent medical assessment.

The local anatomy is comparatively benign, and what the literature records about it is as follows.

• The common fibular (peroneal) nerve is the structure of consequence in this region. It winds around the neck of the fibula — the narrow part of the bone just below the bony head at the outer knee — where it lies close to the surface with little tissue covering it. Dan Nang Xue is recorded distal to GB-34 and therefore below that crossing, but the nerve's branches continue down the leg beneath the point. A sudden electric or radiating sensation into the leg or foot is a recognised warning of direct needle contact with a nerve rather than a sign of correct technique: a review tracing the history of the recognised needling sensations concluded that the electric shock is caused by the needle entering a nerve and should be treated as a warning of possible peripheral nerve injury (Guo Y et al., Neural Plast 2020;2020:8834573, PMID 33204248, PMC7655260).
• There is no body cavity, no lung and no internal organ anywhere near this point. The hazards that govern points over the thorax, the upper back and the abdomen do not arise here — the whole needle path is skin, subcutaneous tissue, the muscles of the outer calf and, beneath them, the fibula. Compare the record held here for BL-43 Gao Huang Shu on the upper back, where pneumothorax is the documented hazard of the region; nothing of that kind applies on the lateral lower leg.
• Bruising and local soreness are the events ordinarily documented at leg points; minor bleeding, bruising and residual soreness are the most frequently reported acupuncture adverse events overall.
• No agreed safe depth exists for any acupuncture point. Two systematic reviews of the safe-depth literature — 33 studies in the first, 47 in the second, measured by MRI, CT, ultrasound and cadaveric dissection — both concluded that measured depths for the same point differ greatly between subject groups and between 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). Neither review reports a figure for this point.
• Risk in proportion. A meta-analysis of prospective clinical studies estimated serious acupuncture-related adverse events at approximately 1 per 10,000 patients and about 8 per million treatments, with roughly 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).

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

Source: Sacred Lotus sources & references (existing needling record; Lan Wei Xue, GB-30 and BL-43 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 584); Chinese Acupuncture & Moxibustion (p. 253); PubMed PMID 17165496, 33204248 (PMC7655260), 21417806, 23935678, 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Dan Nang Xue mean?

Dan Nang Xue means, quite literally, "Gall Bladder Point" — dan nang is the gall bladder as an anatomical organ, and xue is an acupuncture point. The name is worth pausing on, because it is not a classical name. Classical point names are images and metaphors: "Jumping Round", "Wind Pool", "Crane's Summit", "Eyes of the Knee", "Sun and Moon". This one is a label. It names an organ in plain anatomical terms and says the point belongs to it. That flat, descriptive naming is the clearest single sign of the point's twentieth-century origin, and the same is true of its twin Lan Wei Xue — "Appendix Point" — which is held here and named on exactly the same pattern.

Is Dan Nang Xue a classical point?

No — and this is one of the few extra points where the honest answer to that question is a clean "no". Most extra points have some classical pedigree: a mention in the Qian Jin Yao Fang, a place in the Ming compendia, centuries of use before anyone catalogued them formally. Dan Nang Xue has none. It is a modern reflex point, identified in Chinese clinical practice in the middle of the twentieth century from the observation that patients with inflamed gall bladders reliably developed a tender spot on the outer upper calf. It entered the standard extra-point lists from that observation and is numbered EX-LE 6 in the modern scheme, appearing as M-LE-23 in the older "M" (miscellaneous) numbering that some Western texts still use.

Three things follow from that origin, and they are why the distinction is worth making rather than glossing over:

• Its reasoning is anatomical, not channel-based. It was not derived from the course of the Gall Bladder channel; it was found by palpating sick patients. That is why it carries no channel actions, and why the channel-theory language in our earlier record has been removed.
• Its indications are Western disease names. Cholecystitis, cholelithiasis and biliary ascariasis are diagnoses from hospital medicine, not classical pattern categories, and they appear in the point's indication list because the point was defined against them from the outset.
• Being modern has not made it well evidenced. A point identified in the twentieth century has had every opportunity to be tested properly, and largely has not been. That is set out below.

Is Dan Nang Xue a channel point?

No. It is an extra point. Extra points sit outside the fourteen channels: they were recorded for an observed clinical effect rather than derived from channel theory, so they carry no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification. That is why our record shows no channel and no point categories, and why the actions above are framed as documented use rather than as channel mechanics. The Gall Bladder channel does run down the outer leg through this territory — which is why GB-34 lies an inch or two above — but proximity to a channel is not membership of it.

Is there research on Dan Nang Xue?

There are exactly two point-specific items in the indexed biomedical literature, and one of them is a protocol whose results we have not been able to locate. That is a thin evidence base, and it should be described as thin.

• A randomised controlled trial in gallstones. One hundred and twenty patients with cholelithiasis were randomised to frequency-changing electroacupuncture at seven points — LIV-14 Qi Men, ST-21 Liang Men, GB-24 Ri Yue, BL-19 Dan Shu, BL-18 Gan Shu, GB-34 Yang Ling Quan and Dannang (EX-LE 6) — or to a comparison arm combining a stone-expelling decoction, magnesium sulphate, dilute hydrochloric acid, a fatty meal and an instrument-based therapy. The reported total effective rate was 86.7 per cent against 68.3 per cent (Zhongguo Zhen Jiu 2006;26(11):772–4, PMID 17165496). Three cautions belong with that figure: it is a seven-point protocol, so nothing in it is attributable to this point alone; "total effective rate" is a composite outcome of limited reliability; and the comparator is an unusual multi-component regimen rather than a standard of care.
• A head-to-head brain-imaging trial that was designed but whose results are not on record. A protocol published in Trials set out a randomised task-fMRI study of ninety patients with gallbladder stone disease, allocated in equal numbers to acupuncture at GB-34, at Dannangxue (EX-LE 6), or at a non-acupoint, with fatty-food cues presented before and after a thirty-minute treatment and discomfort rated on an eleven-point scale. Its stated purpose was to establish which of the two points has the greater effect and to investigate the central mechanism, which the authors noted had never been examined (Trials 2021;22(1):399, PMID 34127059). This is the only study we have located that was designed to isolate Dan Nang Xue and test it against the channel point above it. We have not found published results and we do not know the outcome. It is recorded here because a well-posed question that has not been answered is itself worth knowing about.

What is missing should be said plainly. There is no trial isolating Dan Nang Xue against a credible control; no study of the tenderness sign's diagnostic accuracy for gall bladder disease comparable to the one that exists for the appendix equivalent; and no modern clinical literature at all on the biliary ascariasis indication, which survives in the point's list on historical grounds. Research attention in this territory has gone to the channel point above instead: an experimental study of electroacupuncture at GB-34 in rabbits with induced acute cholecystitis reported changes in white cell count and gallbladder wall thickness (Zhen Ci Yan Jiu 2015;40(3):233–7, PMID 26237977), and a metabonomic study of acupoint catgut embedding at GB-34 in sixteen patients after surgery for bile duct stones reported changes in bile metabolites and in liver function indicators (J Acupunct Meridian Stud 2024;17(4):133–140, PMID 39205616). Those are studies of GB-34, not of this point, and are cited only to show where the attention has actually gone. A review of acupuncture in gastrointestinal and hepatobiliary disorders listed gallstone expulsion and biliary ascariasis among the applications with a long history of clinical use and few prospective randomised studies behind them (J Altern Complement Med 1999;5(1):27–45, PMID 10100029) — a summary that remains accurate a quarter of a century later.

How does Dan Nang Xue compare with the points near it?

GB-34 Yang Ling Quan sits one to two cun above it and is the point to read alongside this one. GB-34 is a channel point of the first rank — the He-Sea point of the Gall Bladder channel, the Hui-Meeting Point of the Sinews, and one of the Ma Dan-yang Heavenly Star points — with an indication list covering the sinews of the whole body, the flanks, the Liver and Gall Bladder patterns and the lateral leg. Dan Nang Xue has one organ and one small region. GB-24 Ri Yue and BL-19 Dan Shu carry the Gallbladder's organ theory on the front and back of the trunk, as its Front Mu and Back Shu points. Lan Wei Xue, on the same leg two cun below ST-36, is the structural twin described above. And GB-39 Xuan Zhong, further down the same outer leg, is the Hui-Meeting Point for Marrow — a completely different clinical proposition despite sharing the territory, and a reminder that nearness on the leg implies nothing about function.

Source: Sacred Lotus sources & references (name; extra-point status; the GB-24, GB-34, GB-39, BL-18, BL-19, LIV-14, ST-21, ST-36 and Lan Wei Xue records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 584); Chinese Acupuncture & Moxibustion (p. 253); PubMed PMID 17165496, 34127059, 26237977, 39205616, 10100029 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.