Lan Wei Xue Appendix Point

What does Lan Wei Xue do?

Lan Wei Xue is a modern reflex point on the front of the right lower leg, a short way below Zu San Li ST-36, found by pressing for tenderness rather than measured out — and everything documented about it concerns the appendix and the 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 appendix is inflamed and is needled for the condition that makes it tender.

• Used for acute and chronic appendicitis — the defining documented use and the reason the point was named. It is the indication under which Lan Wei Xue appears in every reference that carries it, and a review of the Chinese literature on the point concluded that its best indication is simple appendicitis, with surgery indicated once adhesion, suppuration or perforation has occurred (Zhongguo Zhen Jiu 2018;38(7):735–9, PMID 30014668).
• Used for abdominal pain, distension and indigestion — the general digestive uses recorded alongside the appendiceal one, and the ones under which the point survives in ordinary practice where appendicitis does not present.
• Becomes reflexively tender when the appendix is inflamed — the unusual part, and the reason the point exists. Because it is located by the tenderness it develops, palpating it is part of using it. This is a documented reflex phenomenon, not a diagnostic test, and its measured accuracy is set out plainly under needling — it is poor.
• Used locally for pain, weakness, numbness and paralysis of the lower leg — the secondary use it shares with its neighbours on the front of the shin, and the only documented use with nothing to do with the appendix.

A correction worth stating plainly. Our earlier record for this point opened by saying that it "moves qi and blood and clears heat and fire toxin from the Large Intestine", and closed by saying that it "benefits the local channel". Both phrases have been removed. They are organ- and channel-theory language, and Lan Wei Xue lies on no channel at all — our own record holds it among the extra points with no channel, no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification and no element, all of which were queried directly rather than recalled. There is no channel running through it to be benefited, and no channel relationship through which it could reach the Large Intestine as an organ. The points that genuinely carry that reasoning are all held in Sacred Lotus sources & references and were queried: Tian Shu ST-25, the Front Mu point of the Large Intestine beside the navel, where the organ's qi is said to gather on the front of the body; Da Chang Shu BL-25, the Back Shu point of the Large Intestine in the lumbar region, its counterpart behind; and Shang Ju Xu ST-37 on the shin, which the standard reference literature classifies as the Lower He-Sea point of the Large Intestine — the point through which that organ is reached from the leg. Those three are the theory. Lan Wei Xue is the tender spot below ST-36 that twentieth-century Chinese clinicians noticed and began needling, and saying so leaves the reader with more rather than less.

Source: Sacred Lotus sources & references (existing action and indication record, corrected as described; extra-point status, absent channel and absent point categories queried directly; the ST-25 Front Mu and BL-25 Back Shu classifications queried directly; the ST-36 and ST-37 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 583); Chinese Acupuncture & Moxibustion (p. 252); PMID 30014668; cross-referenced against multiple online sources. The Lower He-Sea classification of ST-37 is attributed to the reference texts, not to our own point record, which classifies it differently.

What is Lan Wei Xue used for?

Lan Wei Xue is used for appendicitis, and after that for ordinary abdominal and digestive complaints and for the leg it sits on. The indications carried in Sacred Lotus sources & references are acute and chronic appendicitis, indigestion, and paralysis of the lower extremities. The wider reference literature adds only closely related presentations. These describe traditional and documented clinical use, not proven treatment — and suspected appendicitis is a surgical emergency requiring immediate medical assessment, which is set out in full under needling.

• Acute appendicitis — as an adjunct within conventional surgical care, never in place of it
• Chronic and recurrent appendiceal pain
• Pain in the lower right abdomen
• Abdominal distension and fullness
• Indigestion and poor appetite
• Nausea and vomiting accompanying abdominal pain
• Constipation or loose stool accompanying the above
• Weakness, numbness and wasting of the lower leg
• Painful obstruction and motor impairment of the lower limb, as a local point
• Paralysis of the lower extremities, as recorded in our own indication record

What it is not used for. The reference literature does not record Lan Wei Xue for the head, the chest, the mind, or any presentation away from the abdomen and the front of the lower leg. Where an intestinal complaint is part of a wider pattern, the points that carry that reasoning are on channels — Tian Shu ST-25 and Da Chang Shu BL-25 as the Front Mu and Back Shu pair of the Large Intestine, Shang Ju Xu ST-37 as the reference texts' Lower He-Sea point of that organ, and Zu San Li ST-36 as the general point of the leg for the abdomen. All are held here, and Lan Wei Xue is used alongside them rather than in place of them.

Source: Sacred Lotus sources & references (existing indication record, reformatted here as a list; the ST-25, ST-36, ST-37 and BL-25 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 583); Chinese Acupuncture & Moxibustion (p. 252); PMID 30014668; cross-referenced against multiple online sources.

Where is Lan Wei Xue, and how is it found?

It is on the front of the right lower leg, roughly two cun below Zu San Li ST-36 — 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 approximately two cun distal to ST-36 on the right leg. In our own words: find the hollow just below and to the outside of the kneecap where ST-36 sits, a finger's breadth out from the front edge of the shin bone, then move roughly two thumb-widths further down the leg and press along that short stretch of muscle until the sorest spot is found. That spot is the point.

Why is Lan Wei 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. Lan Wei Xue is specified differently. The reference literature gives a region — around two cun below ST-36 — and then says to palpate within it for the area of maximal tenderness. The region narrows the search; the tenderness settles it. A review of the Chinese literature on the point put this more strongly than most Western sources do, concluding that Lan Wei Xue "is not a point but an area", and describing it as a reflection of the relationship between an internal organ and the body surface (PMID 30014668).

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, and why the diagnostic-accuracy question set out under needling arises at all.

Only a small handful of points work this way, and Sacred Lotus sources & references hold the closest parallel: Dan Nang Xue, the "Gallbladder Point", located by exactly the same method one to two cun below Yang Ling Quan GB-34, also on the right leg. Reading the two records together is the quickest way to understand either.

Why is Lan Wei Xue described on the right leg only?

Because the appendix 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. Lan Wei Xue is recorded on the right because it is held to be a reflex of a specific organ sitting in the lower right abdomen, and the same logic governs Dan Nang Xue, recorded on the right because the gall bladder 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.

Which points is Lan Wei Xue combined with?

• With Zu San Li ST-36 — its landmark, two cun above it, and its standard partner. ST-36 is the He-Sea and Earth point of the Stomach channel, a Gao Wu Command Point, a Ma Dan-yang Heavenly Star point and a Point of the Sea of Water and Grain — a point of the first rank, held here with all four classifications — and it is the general point of the leg for the abdomen. Lan Wei Xue is needled with it as a matter of routine.
• With Shang Ju Xu ST-37 — a short way below on the same shin, which the reference texts classify as the Lower He-Sea point of the Large Intestine and which is the channel point most specifically directed at that organ from the leg. Where a treatment wants a channel basis for reaching the large intestine, this is the point that supplies it.
• With Tian Shu ST-25 and Da Chang Shu BL-25 — the Front Mu and Back Shu points of the Large Intestine, held here. Bracketing the organ front and back and adding a distal point on the leg is the conventional shape of an intestinal prescription, and it is the shape into which Lan Wei Xue is fitted.
• With He Gu LI-04 — the Yuan-Source point of the Large Intestine channel at the hand, the usual distal addition where the large intestine is the target.
• With Dan Nang 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 appendix below ST-36, one for the gall bladder below GB-34, both on the right leg, both located by tenderness, both named in plain anatomical language.

Where does modern acupuncture research on appendicitis actually sit?

Not at this point. It has moved to the period after the appendix has been removed. This is worth saying because it is the honest picture of the field, and because it explains why so little exists on Lan Wei Xue itself. Two randomised controlled trials were designed in Korea around laparoscopic appendicectomy: one a three-arm trial of electroacupuncture against sham electroacupuncture and no acupuncture for postoperative pain in 138 patients (BMJ Open 2017;7(8):e015286, PMID 28780543, PMC5724078), the other a three-arm trial of electroacupuncture for return of bowel motility and pain in 87 patients (Trials 2015;16:461, PMID 26466590, PMC4606555). Both are published protocols; we have not located published results for either, and we do not know their outcomes. They are recorded because well-posed questions that have not been answered are worth knowing about — and because neither of them uses this point as its variable. A later observational study of Chinese-medicine adjuncts after laparoscopic appendicectomy in 262 patients reported that acupoint herbal plasters combined with ear acupuncture reduced pain and analgesia requirement more than ear acupuncture alone (Pak J Pharm Sci 2025;38(4):1398–1414, PMID 40824014); it is not a study of Lan Wei Xue, and it is cited only to show where the attention has gone.

Source: Sacred Lotus sources & references (location; existing use record; the ST-25, ST-36, ST-37, BL-25, LI-04, GB-34 and Dan Nang Xue records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 583); Chinese Acupuncture & Moxibustion (p. 252); PMID 30014668; PMID 28780543 (PMC5724078); PMID 26466590 (PMC4606555); PMID 40824014 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.

Where is Lan Wei Xue located?

• A Manual of Acupuncture (p. 583): Approximately 2 cun distal to Zusanli ST-36 on the right leg.

How is Lan Wei 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 Lan Wei Xue. Deadman & Al-Khafaji and Chinese Acupuncture & Moxibustion record comparable perpendicular insertion at this site on the front of the lower leg, with moxibustion documented as applicable.

• Angle documented: perpendicular.
• Depth documented: 1 to 1.5 cun — a middling depth for the leg, and the same figure our records carry for its twin Dan Nang Xue on the outer calf.
• Side documented: the right leg, for the reason set out under how the point is used.
• Moxibustion: recorded as applicable in the reference literature.
• Location step first: because this point is defined by tenderness, the reference literature describes palpation of the region before insertion as part of using it, not as an optional extra.

What are the safety considerations at Lan Wei Xue?

The most important consideration at this point is not anatomical at all. It is that acute appendicitis is a surgical emergency, and a tender spot on the leg is not a diagnosis. An inflamed appendix can perforate, and a perforated appendix causes peritonitis, which is life-threatening. Sudden or worsening pain in the lower right abdomen, particularly with fever, vomiting, or pain that is worse on movement or on releasing pressure, requires immediate medical assessment — not palpation of a point. That is recorded here as reference fact rather than as advice, because this point's own defining feature invites exactly the mistake, and because the review literature on the point says the same thing: its documented indication is simple appendicitis, and once adhesion, suppuration or perforation has occurred the indicated management is surgical (PMID 30014668).

How accurate is the Lanwei sign as a diagnostic test?

It has been measured twice, prospectively, by surgical teams — and the answer both times was that it is not good enough to rely on. This is one of the few extra points anywhere in the repertoire whose central claim has actually been put to a clinical test, and the honest thing to do with a negative result is to publish it.

• The larger study. One hundred and sixteen patients admitted to hospital with suspected appendicitis were examined before surgery for reproducible tenderness at the Lanwei point on the right leg, by an examiner blinded to the other findings, and the results compared against the histological diagnosis. A positive Lanwei sign was recorded in 65 cases, 56 per cent. Sixty-five of the 116 patients went to surgery and 59 of those had histologically proven appendicitis. Sensitivity was 64.4 per cent and specificity 50 per cent; the positive predictive value was 92.7 per cent and the negative predictive value 12.5 per cent, with an odds ratio of 1.8. Against the 22 clinical signs assessed, the Lanwei sign ranked between seventh and tenth — below established findings such as McBurney's point tenderness and a tender Sherren's triangle. The authors' conclusion was that a reproducible positive sign is a reasonable pointer toward true appendicitis, but that the very low negative predictive value makes a negative sign nearly worthless, so it cannot reduce negative laparotomy rates and cannot be regarded as a good diagnostic parameter (Alt-Epping S et al., Forsch Komplementarmed Klass Naturheilkd 2002;9(6):338–45, PMID 12618551).
• The earlier study, which found the same. Fifty patients with a presumptive diagnosis of acute appendicitis on conventional grounds were examined prospectively for tenderness at the Lanwei point immediately before general anaesthesia. The presence or absence of tenderness was statistically not a good indicator of appendicitis. The paper's title states its finding without hedging: the lack of importance of the Lanwei point in the diagnosis of acute appendicitis (Levy JH, Texidor MS, Pain 1988;33(1):79–80, PMID 3380555).
• For scale, a benchmark. The Alvarado score — the composite clinical score that guidelines actually recommend for suspected appendicitis — was assessed in a meta-analysis of 26 studies covering 2,579 children, and returned a pooled sensitivity of 76 per cent and specificity of 71 per cent (J Pediatr Surg 2023;58(10):1886–1892, PMID 36966018). Even that composite, built from several signs and laboratory values, is not accurate enough to be used alone. A single point of leg tenderness at 64 per cent and 50 per cent is a long way below it.

What follows from that, stated without softening. Point tenderness at Lan Wei Xue may add a small amount of supporting information within a full clinical assessment. It cannot substitute for conventional medical diagnosis, examination, laboratory testing or imaging, and a negative sign in particular carries almost no reassurance. The 2018 review of the point's own literature makes the constructive version of the same argument: the value of Lan Wei Xue lies in the organ-to-surface reflex it demonstrates, and its safe use depends on keeping the communication with conventional medicine open rather than treating the point as self-sufficient (PMID 30014668).

What is the local anatomy at this point?

Comparatively benign, and what the literature records about it is as follows.

• 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 tibialis anterior muscle on the outer side of the shin bone, and behind that the interosseous membrane and the deeper muscles of the leg. Compare the record held here for BL-13 Fei Shu on the upper back, where pneumothorax is the documented hazard of the region; nothing of that kind applies on the front of the lower leg.
• The nerves and vessels of the region. The anterior tibial artery and vein and the deep fibular (deep peroneal) nerve run down the front of the leg between the muscles, deep to the point. The superficial fibular nerve lies more laterally. 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).
• 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, and no imaging study measuring a depth at Lan Wei Xue was located.
• 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). The anatomical risk at this point is at the low end of that range. The risk that matters here is the diagnostic one.

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; the Dan Nang Xue and BL-13 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 583); Chinese Acupuncture & Moxibustion (p. 252); PMID 12618551; PMID 3380555; PMID 36966018; PMID 30014668; PMID 33204248 (PMC7655260); PMID 21417806; PMID 23935678; PMID 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Lan Wei Xue mean?

Lan Wei Xue means, quite literally, "Appendix Point" — lan wei is the vermiform appendix as an anatomical organ, and xue is an acupuncture point. Sacred Lotus sources & references translate it exactly that way. The name is worth pausing on, because it is not a classical name. Classical point names are images and metaphors: "Jumping Round", "Wind Pool", "Sun and Moon", "Eyes of the Knee", "Celestial Chimney". 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 Dan Nang Xue — "Gallbladder Point" — which is held here and named on exactly the same pattern.

Is Lan Wei Xue a classical point?

No — and this is one of the few extra points where the honest answer 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. Lan Wei 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 an inflamed appendix reliably developed a tender spot on the front of the right lower leg. A review of its literature describes its discovery and application in exactly those terms and calls it "the product of the combination of Western and Chinese medicine" (PMID 30014668). It entered the standard extra-point lists from that observation and is numbered EX-LE 7 in the modern scheme, appearing as M-LE-13 in the older "M" (miscellaneous) numbering that some Western texts still use, and as extra point 22 or 33 in one or two of the older Western lists — the numbering of the extra points has never been fully standardised.

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 Stomach 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 indication is a Western disease name. Appendicitis is a diagnosis from hospital medicine, not a classical pattern category, and it appears in the point's indication list because the point was defined against it from the outset. The classical literature has abdominal-mass and intestinal-abscess categories that overlap with it, but the point was not derived from them.
• Being modern has not made it well evidenced — but it has made it testable, and it was tested. Unlike almost every classical point, Lan Wei Xue makes a falsifiable claim: that tenderness here indicates an inflamed appendix. Two surgical teams tested that claim prospectively and both found it wanting. Those results are set out in full under needling, and they are the most important thing on this page.

Is Lan Wei 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 and no element. That is what our own record shows — no channel, no categories, no element, all queried directly — and it is why the actions above are framed as documented use rather than as channel mechanics. The Stomach channel does run down the front of the leg through this territory, which is why ST-36 lies two cun above and ST-37 a short way below; but proximity to a channel is not membership of it.

Is there research on Lan Wei Xue?

There are three point-specific items in the indexed biomedical literature, and two of the three are studies that found the point's central claim did not hold up. That is a thin and largely negative evidence base, and it should be described as such.

• The prospective diagnostic study in 116 patients (PMID 12618551) — sensitivity 64.4 per cent, specificity 50 per cent, negative predictive value 12.5 per cent, ranked seventh to tenth of 22 clinical signs. Set out in full under needling.
• The earlier prospective study in 50 patients (PMID 3380555) — tenderness at the point was statistically not a good indicator of appendicitis.
• The 2018 Chinese-literature review (PMID 30014668) — a systematic review of the point's discovery and application, drawn from two Chinese databases, concluding that Lan Wei Xue is an area rather than a point, that it reflects an organ-to-surface relationship, that its best indication is simple appendicitis, and that surgery is indicated once adhesion, suppuration or perforation has occurred. This is the most useful single reference on the point, and it is notable that its own conclusion is a call for closer integration with conventional medicine rather than a defence of the point in isolation.

What is missing should be said plainly: there is no randomised controlled trial of needling at Lan Wei Xue for appendicitis or for anything else; no imaging or mechanistic study of the point; and no modern study of its use in chronic appendiceal pain. The two randomised trials designed around appendicectomy in the modern literature are protocols whose results we have not located, and neither uses this point as its variable (PMID 28780543; PMID 26466590). The point's standing rests on a mid-twentieth-century clinical observation, and the two attempts to verify the diagnostic half of that observation both returned negative results.

How does Lan Wei Xue compare with the points near it?

Zu San Li ST-36 sits two cun above it and is the point to read alongside this one. ST-36 is a channel point of the first rank — the He-Sea and Earth point of the Stomach channel, a Gao Wu Command Point, a Ma Dan-yang Heavenly Star point and a Point of the Sea of Water and Grain, all four classifications held in our own record — with an indication list covering the whole digestive system, the qi of the body as a whole, and the leg. Lan Wei Xue has one organ and one small region. Shang Ju Xu ST-37, a short way below on the same shin, is what the reference texts call the Lower He-Sea point of the Large Intestine and is the channel point that carries the organ theory Lan Wei Xue does not. Tian Shu ST-25 and Da Chang Shu BL-25 carry that organ's Front Mu and Back Shu on the trunk. And Dan Nang Xue, on the outer side of the same right leg one to two cun below GB-34, is the structural twin described above: the same century, the same country, the same method of location, the same flat anatomical name, and — in its case — no diagnostic-accuracy study at all, which makes the pair instructive to read together. All are held in this library.

Source: Sacred Lotus sources & references (name and translation; extra-point status, absent channel, categories and element queried directly; the ST-25, ST-36, ST-37, BL-25, GB-34 and Dan Nang Xue records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 583); Chinese Acupuncture & Moxibustion (p. 252); PMID 30014668; PMID 12618551; PMID 3380555; PMID 28780543; PMID 26466590 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.