Er Bai Two Whites

What does Er Bai do?

Er Bai is an extra point — it belongs to no channel and carries no point category, so it has no channel-theory actions; everything below comes from documented clinical use. In that documented use it exists for essentially one purpose: it is the classical distal point for haemorrhoids and for the complaints of the anal region, used on the forearm, far from the site of trouble.

• The classical haemorrhoid point — this is the defining documented use, recorded consistently across the reference literature and the reason the point has survived at all. Bleeding, painful and prolapsing haemorrhoids are what the sources name first.
• Used for prolapse of the rectum — recorded alongside haemorrhoids in the same group of indications; our own record extends this to prolapse of the uterus and colon.
• Used for anal itching, tenesmus and blood in the stool — the associated anal-region complaints that travel with haemorrhoids in the sources.
• A distal point treated at a distance from the complaint — its whole clinical character is that it is on the forearm. Nothing needs to be done at the anal region for the point to be used, which is a large part of why it has stayed in use.
• Recorded as a supporting point after haemorrhoid surgery in the modern literature — the modern trial work that names Er Bai is about pain and bleeding after surgery rather than about haemorrhoids themselves, and it always uses the point inside a small protocol alongside channel points.

A correction worth stating plainly. Er Bai is often described as "lifting sinking qi" and "stopping bleeding". Those are organ and channel-theory phrases, and Er Bai is on no channel — it has no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification, and no channel runs through it. Our own earlier record carried both phrases and they have been removed. The point classically credited with raising sinking qi in prolapse is DU-20 Bai Hui at the vertex, on the Governing vessel; the channel points of the anal region itself are DU-01 Chang Qiang at the tip of the coccyx, BL-57 Cheng Shan on the calf and BL-30 Bai Huan Shu on the sacrum. What the sources actually document for Er Bai is the clinical target — haemorrhoids and prolapse — not a channel mechanism.

Source: Sacred Lotus sources & references (existing action and indication record, corrected as described); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 580); Chinese Acupuncture & Moxibustion (pp. 250–251); cross-referenced against multiple online sources.

What is Er Bai used for?

Er Bai is used above all for haemorrhoids. The indications carried in Sacred Lotus sources & references are haemorrhoids, prolapse of the rectum, uterus and colon, itching of the anus, blood in the stools and tenesmus; the wider reference literature sets them out as follows.

• Haemorrhoids — the leading and defining indication
• Bleeding haemorrhoids
• Blood in the stool
• Prolapse of the rectum
• Prolapse of the uterus
• Prolapse of the colon
• Itching of the anus
• Tenesmus — the persistent urge to pass stool with little result
• Pain and swelling of the anal region
• Pain and bleeding after haemorrhoid surgery (modern use, always within a multi-point protocol)
• Pain of the forearm at the point itself (a minor local use)

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 580); Chinese Acupuncture & Moxibustion (pp. 250–251); PubMed PMID 29318862, 28071133, 32798197; cross-referenced against multiple online sources.

How is Er Bai used in practice?

Er Bai lies on the palm side of the forearm, four cun above the wrist crease at P-07 Da Ling, sitting either side of the tendon of flexor carpi radialis — the cord that stands out when the wrist is flexed against resistance. Its whole clinical character follows from that position: it is a distal point, treated on the forearm for a complaint at the far end of the body, and it is normally used on both arms.

Why is Er Bai one point name with two locations?

Because the name records a pair — one position on each side of the flexor carpi radialis tendon. A single treatment at Er Bai therefore means two needles per forearm, four in all when both arms are used, and a reader counting needles rather than point names will find the arithmetic surprising. This is not unique to Er Bai: Si Feng is one name over four finger creases, Shi Xuan one name over ten fingertips, and Ba Xie one name over eight positions between the knuckles — all held in Sacred Lotus sources & references. Among the extra points, a name is often a set rather than a spot.

Which points is Er Bai combined with?

• With BL-57 Cheng Shan — the standard partner. Cheng Shan on the calf is the principal channel point associated with haemorrhoids, the two are named together in classical and modern practice alike, and every modern study that has looked at Er Bai has paired it with BL-57.
• With DU-01 Chang Qiang — the Governing vessel point at the tip of the coccyx, the local point of the anal region, added when treatment at the site itself is wanted.
• With DU-20 Bai Hui — added specifically where prolapse rather than bleeding dominates the picture. DU-20 is the point classically credited with raising what has sunk; Er Bai is the distal companion, not the carrier of that action.
• With BL-30 Bai Huan Shu and BL-35 Hui Yang — the sacral points of the anal region, both held in Sacred Lotus sources & references.
• With BL-25 Da Chang Shu — the Large Intestine back-shu point, used alongside BL-57 and Er Bai in the modern post-operative protocols.
• With SP-06 San Yin Jiao and REN-06 Qi Hai — added in the prolapse picture, where treatment is aimed at the abdomen and pelvis rather than at the anal region alone.

Where does Er Bai sit relative to the Pericardium channel?

Very close to it, which is worth understanding rather than confusing. Four cun above the wrist crease places Er Bai between P-05 Jian Shi (three cun) and P-04 Xi Men (five cun), and the position on the ulnar side of the flexor carpi radialis tendon lies near the Pericardium line itself. Er Bai is nonetheless not a Pericardium point: it is measured from a tendon rather than from a channel, it carries two positions where a channel point carries one, and none of the Pericardium points at that level are used for haemorrhoids. The proximity is anatomical, not theoretical.

Source: Sacred Lotus sources & references (location and existing use record; BL-25, BL-30, BL-35, BL-57, DU-01, DU-20, P-04, P-05, P-07, SP-06, REN-06, Si Feng, Shi Xuan and Ba Xie records); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 580); Chinese Acupuncture & Moxibustion (pp. 250–251); PubMed PMID 29318862, 32798197; cross-referenced against multiple online sources.

Where is Er Bai located?

• A Manual of Acupuncture (p. 580): On the flexor aspect of the forearm, 4 cun proximal to Daling (PER-7), either side of the tendon of flexor carpi radialis.

How is Er Bai needled in the textbooks?

Reference record only — this describes what the standard texts document, not instruction for a reader. Sacred Lotus sources & references record perpendicular insertion of 0.5 to 1 cun at Er Bai, or oblique insertion directed proximally of 1 to 1.5 cun. Because the name covers two positions either side of the flexor carpi radialis tendon, the recorded technique is applied at both.

• Angle documented: perpendicular, or oblique directed proximally up the forearm.
• Depth documented: approximately 0.5 to 1 cun perpendicular; 1 to 1.5 cun oblique.
• Number of positions: two per forearm, one on each side of the flexor carpi radialis tendon — a single named point recorded at two sites.
• Moxibustion: recorded as permissible at this point in the reference literature.
• Electroacupuncture and transcutaneous stimulation: both documented in the modern post-operative trial literature, which applied low-frequency stimulation at Er Bai together with BL-57.

Safety reference. Er Bai lies on the flexor aspect of the mid-forearm, a region with no body cavity beneath it and therefore none of the hazard that governs points over the thorax or the upper back. What bounds it is vascular and neural rather than visceral. The median nerve runs deep in the midline of the forearm, close to the ulnar of the two Er Bai positions, and the radial artery runs on the radial side of the flexor carpi radialis tendon, close to the radial position — which is why the recorded depths are moderate and why the tendon itself is the landmark the texts measure from. A sharp radiating sensation into the hand is the event the literature associates with contact on the nerve, and local bruising is the event associated with the vessel. Standard clean-needle practice applies, and the modern trials that used electrical stimulation here reported no significant adverse events. Acupuncture is performed by qualified, licensed practitioners; this record documents the literature and is not a technique guide.

Source: Sacred Lotus sources & references (existing needling record); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 580); Chinese Acupuncture & Moxibustion (pp. 250–251); PubMed PMID 29318862, 28071133.

What does the name Er Bai mean?

Er Bai means "Two Whites" — er for two, bai for white. The "two" is the plainer half: the point is a pair, one position either side of the flexor carpi radialis tendon, and the name records that duplication. The "white" is read differently by different commentators, most often as a reference to the pale, glistening appearance of the tendon the two positions straddle — the one landmark on which the location depends. The site also carries the modern code EX-UE 2 in the standardised extra-point numbering used by the research literature, and appears in older schemes as M-UE-29. Readers meeting several "white" point names should note that ST-02 Si Bai, "Four Whites", is an unrelated Stomach-channel point on the face, held separately in Sacred Lotus sources & references.

Is Er Bai a channel point?

No. Er Bai is an extra point — one of the points recorded outside the fourteen channels for an observed clinical effect rather than derived from channel theory. Extra points carry no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification, which is why our record shows no channel and no categories, and why the actions above are framed as documented uses rather than as channel mechanics. Any description of Er Bai "lifting qi" or "regulating" a named organ should be read with that in mind.

Why treat haemorrhoids from the forearm?

Because the point was recorded for the result, not for a route. Er Bai is one of the clearest examples in the extra-point literature of a purely empirical distal point: there is no channel connecting the mid-forearm to the anal region, and the texts that record Er Bai do not claim one. What they record is that treatment there was observed to help, and the point has been carried forward on that basis for centuries. It also has a practical advantage that keeps it in use — a person with haemorrhoids can be treated seated and fully clothed, at the forearm, which is not true of the sacral and perianal points.

Is there research on Er Bai?

The honest answer is that point-specific evidence for Er Bai is thin, and none of it isolates the point. Every study that names Er Bai uses it inside a small protocol with channel points — usually BL-57 Cheng Shan — so the results describe the protocol, not this point. Nothing has tested Er Bai alone, and no study at all has tested it for haemorrhoids themselves as opposed to recovery after haemorrhoid surgery. That gap matters, because the traditional indication and the researched indication are not the same thing.

• Electroacupuncture after haemorrhoid surgery. A randomised trial in 60 patients applied electroacupuncture at BL-57 Cheng Shan, BL-25 Da Chang Shu and Er Bai (EX-UE 2) for thirty minutes daily over three days after surgery for mixed haemorrhoids, and reported greater improvement in anal pain, a sense of anal distension and bleeding on days two and three than basic care alone (Zhen Ci Yan Jiu 2017;42(6):533–536, PMID 29318862). Three points were stimulated together, so no part of the effect can be assigned to Er Bai.
• Transcutaneous stimulation after haemorrhoid surgery. A randomised controlled study in 80 patients gave four twenty-minute sessions of transcutaneous acupoint electrical stimulation at BL-57 Cheng Shan and Er Bai (EX-UE 2), reporting lower pain and anxiety scores and some heart-rate-variability differences against no stimulation (Clin Nurs Res 2018;27(4):450–466, PMID 28071133). Two points again, and an untreated control rather than a sham.
• Non-needle pressure after haemorrhoid surgery. A patient- and assessor-blinded randomised trial in 154 patients used pestle-needle pressure at DU-02 Yao Shu, DU-04 Ming Men, DU-01 Chang Qiang, BL-57 Cheng Shan, Er Bai (EX-UE 2) and perianal positions against a light-pressure sham, reporting lower pain scores after surgery (J Integr Med 2020;18(6):492–498, PMID 32798197). This is the best-designed of the three because it carried a genuine sham control — but it stimulated six sites at once and used no needles at all.

Taken together: three small trials, all post-surgical, all multi-point, none isolating Er Bai, and none addressing the indication for which the point is actually famous. Er Bai's standing rests on long empirical use recorded in the reference literature, not on trial evidence, and it is more honest to say so than to present the haemorrhoidectomy studies as though they had validated the classical point.

How does Er Bai compare with the other haemorrhoid points?

BL-57 Cheng Shan on the calf is the channel point most closely associated with haemorrhoids, and is Er Bai's constant partner rather than its rival. DU-01 Chang Qiang at the tip of the coccyx is the local point, immediately at the region. BL-30 Bai Huan Shu and BL-35 Hui Yang are the sacral points of the same group, and BL-56 Cheng Jin sits above BL-57 on the same line of the calf — all held in Sacred Lotus sources & references. Among these Er Bai is the outlier in position and the easiest to reach: the only one of the group on the upper limb, and the only one requiring nothing to be uncovered.

Source: Sacred Lotus sources & references (existing record; BL-25, BL-30, BL-35, BL-56, BL-57, DU-01, DU-20, ST-02 and extra-point records); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 580); Chinese Acupuncture & Moxibustion (pp. 250–251); PubMed PMID 29318862, 28071133, 32798197 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.