GB-44 (Zu Qiao Yin) Foot Portal Yin

What does GB-44 Zu Qiao Yin do?

Zu Qiao Yin GB-44 is the Jing-Well and Metal point of the Gall Bladder channel of Foot Shao Yang, at the outer corner of the fourth toenail, and its recorded work is to clear heat and benefit the head, to benefit the chest and the sides of the ribs, and to calm the spirit. Sacred Lotus sources & references record that classification and those three actions directly. It is the last point of the Gall Bladder channel and the end of the whole shao yang line down the side of the body — which is why a point on a toe carries indications for the head, the ear and the eye.

• Clears heat and benefits the head — the defining action. The Gall Bladder channel runs in zig-zags over the side of the head, encircles the ear and reaches the outer corner of the eye before descending the whole side of the body to this toe. A heat-clearing point at the far end of that channel is what the tradition wants for a hot, throbbing, one-sided head, for the ear and for the eye. Migraine, deafness, tinnitus and eye pain are the indications our own record names first, and this is the action behind all of them.
• Benefits the chest and the lateral costal region — the second recorded action. The sides of the ribs are shao yang territory, and fullness, distension or pain there is classically read as a Gall Bladder channel disturbance.
• Calms the spirit — the third recorded action, and the one behind its use for dream-disturbed sleep, restlessness and agitation. Jing-Well points as a class are associated with sudden and acute states of mind as well as of body.
• Restores consciousness and clears heat in acute states — the emergency action shared across the whole Jing-Well group, which is the reason our own record lists febrile disease among its indications. Loss of consciousness is a medical emergency requiring immediate emergency medical care; what is recorded here is what the classical literature describes, not a course of action.

Is GB-44 the tonification or sedation point of the Gall Bladder channel?

Neither — and the answer is derived here from the element data rather than assumed, because this is exactly the kind of claim that gets copied wrongly. GB-44 is the Metal point of a Wood channel, which makes it the channel's controlling-element point and none of the three named five-shu roles. The derivation, step by step:

• The Gall Bladder is a yang Wood channel. That is not asserted from memory: the whole Gall Bladder element column was queried, and it returns the yang-channel five-shu order exactly — GB-44 Jing-Well & Metal, GB-43 Ying-Spring & Water, GB-41 Shu-Stream & Wood, GB-38 Jing-River & Fire, GB-34 He-Sea & Earth. On a yang channel the sequence runs Metal, Water, Wood, Fire, Earth, and the channel's own element is the one that lands on its Shu-Stream point. Here that is Wood.
• The tonification point is the mother. In the generating cycle Water produces Wood, so the Water point tonifies. That is GB-43 Xia Xi. Our GB-43 record makes the same derivation from its own side, and this record confirms it rather than correcting it.
• The sedation point is the child. Wood produces Fire, so the channel is drained through its Fire point. That is GB-38 Yang Fu. Our GB-38 record makes the same derivation from its own side, and this record confirms it.
• The horary point is the channel's own element on itself. That is GB-41 Zu Lin Qi, the Wood point of a Wood channel.
• GB-44 is Metal, and Metal controls Wood on the restraining cycle. Being controlled by an element is not one of the mother-child relationships the five-shu tonification and sedation rules are built from, so GB-44 has no tonification, sedation or horary role. Its counterpart is GB-34, the Earth point — the element that Wood controls. Between them, GB-44 and GB-34 are the two ends of the restraining relationship: the element that restrains this channel and the element it restrains.

Why say all this on a page about a toe point? Because "Jing-Well and Metal point" is a classification a reader will meet everywhere and will reasonably assume means something operational. It does — but what it means here is that GB-44 belongs to the acute, emergency, heat-clearing end of the repertoire because it is a Jing-Well point, not because Metal gives it a supplementing or draining job. Those jobs belong to GB-43 and GB-38.

Source: Sacred Lotus sources & references (channel, the Jing-Well & Metal classification, the whole Gall Bladder element column and the GB-34, GB-38, GB-41 and GB-43 records queried directly; the existing action record reformatted here from a broken bare list run); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 464; Chinese Acupuncture & Moxibustion, p. 221; Nan Jing (Classic of Difficulties), chapters 64, 68 and 69, on the five-shu elements and the mother-child rule; cross-referenced against multiple online sources.

What is GB-44 Zu Qiao Yin used for?

Zu Qiao Yin GB-44 is used above all for one-sided headache and migraine, and after that for the ear, the eye, restless dream-filled sleep, and acute febrile states. The indications carried in Sacred Lotus sources & references are migraine, deafness, tinnitus, eye pain, dream-disturbed sleep and febrile diseases. The standard reference literature sets them out more fully below. These describe traditional use, not proven treatment.

• Migraine and one-sided headache — the leading indication
• Headache at the temple and side of the head
• Deafness and sudden loss of hearing
• Tinnitus (ringing in the ears)
• Pain of the eye, particularly at the outer corner
• Redness and swelling of the eye
• Dream-disturbed sleep, restless sleep and insomnia
• Agitation, restlessness and irritability
• Febrile disease with heat that will not break
• Sore throat and swelling of the throat
• Fullness, distension or pain in the chest and the sides of the ribs
• Cough and difficult breathing, in the classical record
• Pain and heat of the outer foot and the fourth toe
• Nightmares and sudden fright, in the classical record

Why a point on the fourth toe treats the head. The Gall Bladder channel begins at the outer corner of the eye, loops repeatedly over the side of the head, passes around the ear, descends the neck, the side of the trunk and the outer leg, and ends here. GB-44 is the last point on that road, and in the classical scheme the far end of a channel is used for what happens at its beginning — the more so at the Jing-Well points, which are the acute-response members of the set. That is why the indications of a toe point read like the indications of a head point. It is classical reasoning, recorded because our sources record it, and not a claim of proven effect. The one place it has been put to a modern test is described under research.

Source: Sacred Lotus sources & references (existing indication record, reformatted here as a list from a bare comma-run); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 464; Chinese Acupuncture & Moxibustion, p. 221; cross-referenced against multiple online sources.

Where is GB-44 Zu Qiao Yin, and how is it used in practice?

Zu Qiao Yin lies at the outer corner of the fourth toenail — about a tenth of a cun from the corner, where a line along the outer edge of the nail meets a line along its base. In plain terms: the little-toe side of the fourth toe, right at the nail corner. Sacred Lotus sources & references hold two location records and they agree exactly. There is no discrepancy between them to flag.

In practice GB-44 is not a routine clinic point, and it is worth saying so plainly. Most of the Gall Bladder channel's day-to-day work is done by GB-20 Feng Chi at the back of the head, GB-34 Yang Ling Quan below the knee, GB-41 Zu Lin Qi on the foot and GB-43 Xia Xi in the web of the toes. GB-44 belongs to the acute end of the repertoire — the sudden severe one-sided headache, the fever that will not break, the acute agitation — and the technique it is most associated with is pricking to bleed rather than retained needling. That is how the Jing-Well points are handled as a class, and it is how the one randomised trial naming this point used it.

Which points is GB-44 combined with?

• With Zu Lin Qi GB-41 and Xia Xi GB-43 — its immediate neighbours up the same channel, both held here. GB-41 is the Shu-Stream and Wood point and the Confluent Point of the Girdling Vessel; GB-43 is the Ying-Spring and Water point and the channel's tonification point. For one-sided headache the usual distal choice is GB-43 or GB-41 rather than GB-44 — GB-44 is reserved for the acute, severe presentation.
• With Feng Chi GB-20, Shuai Gu GB-08 and Tai Yang — the local points for one-sided headache at the back and side of the head, all held here (Tai Yang as an extra point at the temple). The randomised trial described under research combined bloodletting at GB-44 with routine needling at exactly this kind of local group.
• With He Gu LI-04 and Tai Chong LIV-03 — the "Four Gates", both held here, and the standard distal pair for headache and for moving stagnation generally.
• With Yang Ling Quan GB-34 and Wai Guan SJ-05 — the He-Sea point of the channel and the Confluent Point of the Yang Linking Vessel, both held here; the standard shao yang combination for the side of the body and the side of the head.
• With Ting Gong SI-19 and Yi Feng SJ-17 — local points at the ear, both held here, for the deafness and tinnitus indications. Queried directly, our own records classify SI-19 as a Meeting Point of the Small Intestine, San Jiao and Gall Bladder channels and SJ-17 as a Meeting Point of the San Jiao and Gall Bladder channels, so both already carry this channel.
• With Zhi Yin BL-67 and Li Dui ST-45 — the Jing-Well points of the other two yang channels of the foot, both held here. The three are used as a group for headache, chosen by where the pain sits, and that grouping is the design of the randomised trial below.
• With the other eleven Jing-Well points — the twelve are frequently treated as a set rather than individually, particularly in the emergency and first-aid literature. Sacred Lotus sources & references hold all twelve; they are listed in full below.

Which twelve Jing-Well points does this site hold?

Sacred Lotus sources & references hold all twelve Jing-Well points — one at the end of each of the twelve regular channels — and the set was queried directly rather than recalled. Their five-element assignments follow the classical rule exactly: on the six yin channels the Jing-Well point is a Wood point; on the six yang channels it is a Metal point. The twelve, as our own records classify them:

• LU-11 Shao Shang (Lung) — Wood. Radial corner of the thumbnail.
• LI-01 Shang Yang (Large Intestine) — Metal. Corner of the index-finger nail.
• P-09 Zhong Chong (Pericardium) — Wood. Middle finger.
• SJ-01 Guan Chong (San Jiao) — Metal. Ring finger.
• HT-09 Shao Chong (Heart) — Wood. Radial corner of the little-finger nail.
• SI-01 Shao Ze (Small Intestine) — Metal. Ulnar corner of the little-finger nail.
• SP-01 Yin Bai (Spleen) — Wood. Medial corner of the great-toe nail. Also a Ghost point.
• LIV-01 Da Dun (Liver) — Wood. Lateral corner of the great-toe nail.
• ST-45 Li Dui (Stomach) — Metal. Second toe.
• GB-44 Zu Qiao Yin (Gall Bladder) — Metal. Fourth toe. This point.
• BL-67 Zhi Yin (Bladder) — Metal. Little toe.
• KI-01 Yong Quan (Kidney) — Wood. The exception: alone among the twelve it is not at a nail corner but on the sole of the foot.

What a Jing-Well point is, in plain terms. Jing here means a well — the image is of the channel's qi as water, welling up at the extremity of the limb where the channel begins or ends. They are the first points of the yin channels and the last of the yang ones, they sit at the very tips of the fingers and toes, and the whole class is recorded for acute, sudden and severe presentations: high fever, collapse, sudden severe pain, acute agitation. GB-44 is the Gall Bladder channel's member of that group.

Source: Sacred Lotus sources & references (both location records; the complete twelve-point Jing-Well set and the LI-04, LIV-03, SJ-05, SJ-17, SI-19, ST-45, BL-67, GB-08, GB-20, GB-34, GB-41, GB-43 and Tai Yang records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 464; Chinese Acupuncture & Moxibustion, p. 221; Ling Shu (Spiritual Pivot), chapter 1, on the five transport points; cross-referenced against multiple online sources.

Where is GB-44 located?

• A Manual of Acupuncture (p. 464): On the dorsal aspect of the 4th toe, at the junction of lines drawn along the lateral border of the nail and the base of the nail, approximately 0.1 cun from the corner of the nail.
• Chinese Acupuncture and Moxibustion (p. 221): On the lateral side of the fourth toe, about 0.1 cun from the corner of the nail.

How is GB-44 Zu Qiao Yin needled?

Stated plainly and in proportion: GB-44 is a low-hazard point. It lies at the corner of the fourth toenail, where there is skin, a thin layer of tissue and then the bone of the toe — no cavity, no organ, no major vessel and no major nerve in the needle's path. Sacred Lotus sources & references record superficial insertion of about 0.1 inch, with moxibustion applicable. Everything below is recorded as neutral reference data describing what the textbooks and the published literature document. It is not instruction, this page does not teach technique, and needling is carried out only by a qualified, licensed practitioner.

The angle and depth the texts record

• Sacred Lotus sources & references record superficial insertion of about 0.1 inch, with moxibustion applicable. That is among the shallowest figures in this library, and the reason is simply that there is nothing to insert into — a tenth of an inch is the full thickness of tissue at a nail corner before bone.
• Deadman & Al-Khafaji (p. 464) and Chinese Acupuncture & Moxibustion (p. 221) record the same shallow perpendicular or slightly oblique insertion, and both additionally record pricking to bleed — a single quick puncture with a fine or three-edged needle, releasing a few drops of blood — as the technique classically associated with the Jing-Well points.
• Bloodletting, recorded as neutral reference fact. The classical literature and the modern Chinese clinical literature both describe pricking the Jing-Well points to bleed for acute heat, acute pain and acute agitation. It is recorded here because it is what the sources document at this class of point and because the randomised trial described under research used precisely that technique at GB-44. It is documented, not advised, and it is a procedure for a qualified practitioner.
• Moxibustion is recorded as applicable.

What lies beneath

• The tissue in order. At the outer corner of the fourth toenail a needle passes through skin and a thin layer of subcutaneous tissue and meets the distal phalanx — the last small bone of the toe. That is the entire depth available, and it is why the recorded figure is a tenth of an inch.
• What is present in the region. The nail bed and the small terminal branches of the digital nerves and vessels supply the toe tip; they are why the point is sharply sensitive and why it bleeds readily when pricked. Neither is a structure whose injury is reported in the safety literature.
• Why the point is uncomfortable rather than dangerous. The fingertips and toe tips have the densest sensory innervation on the body. Points at the nail corners are among the most painful in the repertoire and among the safest, and those two facts are the same fact. Our LU-11, BL-67 and LIV-01 records make the same observation about their own nail-corner points.

The measured evidence — and what it does and does not cover

• No published imaging, ultrasound or cadaveric measurement of needling depth at GB-44 was located, and none is quoted. The nail-corner points have generated no such literature, for the obvious reason that there is nothing beneath them to measure a distance to.
• No single agreed safe depth exists for any point. Two systematic reviews of the safe-depth literature — 33 studies in one, 47 in the other, by MRI, CT, ultrasound and cadaveric dissection — both concluded that measured depths for the same point differ greatly between subject groups and 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 reports a figure for this point.
• Where the serious events of acupuncture actually cluster. Systematic reviews of the Chinese case literature place them over the chest, the abdomen, the neck and the orbit, attributed chiefly to improper technique (He W et al., J Altern Complement Med 2012;18(10):892–901, PMID 22967282). The extremities are not among them.
• Risk in proportion. A meta-analysis of prospective clinical studies estimated serious 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). At a point where bleeding is part of the recorded technique, that first category is a description rather than an adverse event.
• Honest limit. No published case report naming GB-44 in connection with any adverse event was located, and none is asserted.

Source: Sacred Lotus sources & references (existing needling record and both location records; the LU-11, BL-67 and LIV-01 records queried directly for comparison); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 464; Chinese Acupuncture & Moxibustion, p. 221; PMID 31930896 (bloodletting technique at this point); PMID 21417806; PMID 23935678; PMID 22967282; PMID 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Zu Qiao Yin mean?

Zu Qiao Yin means "Foot Portal Yin" — zu, the foot; qiao, an opening, orifice or portal; and yin, the yin aspect. Sacred Lotus sources & references translate it exactly that way. Two readings of the middle character are given in the commentaries and both are informative. The first is anatomical: qiao names the orifices of the head — the eyes, ears, nose and mouth — and this point, at the far end of a channel that begins at the eye and loops around the ear, is understood to reach them. The second is transitional: the point sits at the portal where the Gall Bladder channel, a yang channel, hands over to the Liver channel, a yin one. Both readings say the same thing about the point's position: it is a threshold.

The zu ("foot") in the name is doing real work and is worth noticing. It is there to distinguish this point from Tou Qiao Yin GB-11, "Head Portal Yin", on the side of the head — the same two characters qiao yin, prefixed by "head" instead of "foot". The Gall Bladder channel carries several such pairs, distinguished only by tou or zu: our own records also hold Zu Lin Qi GB-41 ("Foot Overlooking Tears") against Tou Lin Qi GB-15 on the head. The prefix is not decoration; without it the names are ambiguous, and the same lesson applies here as at the Ju Liao collision our GB-29 record closes: a pinyin name alone never identifies a point. The channel and code together do.

Why does it matter that GB-44 is a Jing-Well and Metal point?

The two halves of that classification do different jobs, and separating them is what makes the point intelligible.

• "Jing-Well" tells you when the point is used. The Jing-Well points are the acute-response class: high fever, collapse, sudden severe pain, acute agitation, and — at this channel — the sudden severe one-sided headache. It is also the reason bloodletting rather than retained needling is the technique associated with them. This half of the classification is the operative one.
• "Metal" tells you where the point sits in the five-element arithmetic — and here the honest answer is that it gives GB-44 no supplementing or draining role at all. The Gall Bladder is a yang Wood channel, confirmed from our own element column. Metal controls Wood on the restraining cycle, and control is not one of the mother-child relationships the tonification and sedation rules are built from. So GB-44 is not the tonification point (that is GB-43 Xia Xi, the Water point and the mother of Wood), not the sedation point (that is GB-38 Yang Fu, the Fire point and the child of Wood), and not the horary point (that is GB-41 Zu Lin Qi, Wood on Wood). It is the controlling-element point, whose mirror image is GB-34 Yang Ling Quan, the Earth point — the element Wood controls. All four of those points are held here and all were queried; our GB-43 and GB-38 records set out the same derivation from their own sides, and both are confirmed by the derivation made here.

One consequence worth stating for a reader who has learnt the five-shu tables: the fact that all six yang channels have a Metal Jing-Well point means the Jing-Well point can only ever be the tonification or sedation point of the yang channels whose own element is Water or Earth. On the Gall Bladder channel it is neither, and no supplementing or draining claim should be attached to GB-44 on element grounds.

Is there research on GB-44 Zu Qiao Yin?

Yes — four indexed records name Zuqiaoyin GB-44 explicitly, which is unusual for a point of this rank. Three concern headache and one is a point-selection review. None isolates GB-44 from the other points used with it, and that is stated in each case.

• A randomised trial in which bloodletting at GB-44 was the added intervention. Sixty patients with migraine were randomised to routine acupuncture alone or to routine acupuncture plus bloodletting at the Jing-Well points of the three yang channels of the foot — Li Dui ST-45, Zhi Yin BL-67 and Zuqiaoyin GB-44 — selected according to where the pain sat. Routine acupuncture in both arms was at SJ-23, GB-08, Tai Yang, GB-20, LI-04, LIV-03, GB-41, GB-34 and SJ-05, once daily for 30 minutes, five days a course with two days' interval, for two courses. Visual analogue pain scores fell in both groups immediately after needle withdrawal, at four hours and after two courses, and were lower in the bloodletting group at every one of those time points (P < 0.05), with a greater fall in the composite migraine score; the total effective rate, however, did not differ significantly (92.3 per cent against 89.7 per cent, P > 0.05) (Liu LY et al., Zhongguo Zhen Jiu 2020;40(1):32–36, PMID 31930896). Limits: 60 patients at one centre with five dropouts; no sham arm, so the comparison is added stimulation against none and cannot separate the point from the extra procedure; a visible bloodletting procedure cannot be blinded; and GB-44 was used only in the subset whose pain was at the side of the head. It is included because it is a randomised trial in which this point's own classical technique was the variable.
• Brain imaging, with GB-44 chosen for shao yang headache. Fifteen patients with migraine without aura were treated with acupuncture selected on the classical "root and knot" (gen jie) theory — Zuqiaoyin GB-44 for shao yang headache, Li Dui ST-45 for yang ming headache, Zhi Yin BL-67 for tai yang headache, plus ashi points — three times a week for four weeks, with functional MRI before and after. Functional connectivity within the default mode network weakened at several node pairs after treatment, and attack frequency, pain, anxiety and depression scores fell while migraine-specific quality of life rose (Jia JN et al., Zhongguo Zhen Jiu 2021;41(10):1074–1078, PMID 34628737). Limits are severe and the authors call it preliminary: fifteen patients, no control group of any kind, no sham, and imaging changes that cannot be attributed to one point. Its interest is that the point selection was made by the same channel reasoning this page describes — GB-44 for the side of the head, because the Gall Bladder channel runs there.
• GB-44 as one of the twelve Jing-Well points, used as a set. Sixty-three patients with urinary retention after stroke were randomised to intermittent catheterisation with bladder function training, or to that plus acupuncture at all twelve Jing-Well points in the order of the qi cycle — LU-11, LI-01, ST-45, SP-01, HT-09, SI-01, BL-67, KI-01, P-09, SJ-01, Zuqiaoyin GB-44 and LIV-01 — once daily for 20 treatments. The acupuncture group had a higher total effective rate (90.6 per cent against 67.7 per cent, P < 0.01) and lower residual urine volume (P < 0.01) (Yang Y et al., Zhongguo Zhen Jiu 2017;37(10):1041–1044, PMID 29354970). Twelve points used together, no sham, single centre — nothing here is attributable to GB-44, and it is cited only as evidence that the twelve are genuinely used as a set in modern practice.
• A point-selection review naming GB-44. A literature review of acupuncture for radiation-induced dry mouth identified 48 points in use across the included studies, Zuqiaoyin GB-44 among them, and proposed a standardised prescription (Chin J Integr Med 2016;22(7), PMID 26311288). It measures what practitioners chose, not what worked.
• On the Jing-Well class generally. A review of the relationship between the twelve Jing-Well points and the extra point Shi Xuan traced their shared origin and concluded that the Jing-Well points are generally the choice for internal disease, local disease and disease along a channel's course and can stand alone, whereas Shi Xuan is the first option in acute tense syndrome and syncope (PMID 32394666). Both are held here.
• What is not here. There is no randomised trial of GB-44 alone, no sham-controlled study isolating it, no trial of its ear, eye or sleep indications, and no anatomical measurement at it. Its standing rests on the classical record, on its Jing-Well classification and on its position at the end of the Gall Bladder channel.

A point-code caution, recorded because it was met while assembling this. Searching the pinyin "Zuqiaoyin" returns a small, clean and entirely readable set — five records, every one of them about acupuncture, which is a far better result than most points give. Searching the code "GB 44" without qualification is useless, because the string matches ordinary text throughout the biomedical literature. Every record considered for this page was read rather than counted.

How does Zu Qiao Yin differ from the points near it?

Xia Xi GB-43 lies just above in the web between the fourth and little toes, held here, and is the Ying-Spring and Water point — the channel's tonification point and, in ordinary practice, the far more used of the two for one-sided headache and for the ear. Zu Lin Qi GB-41 lies further up the foot, held here, the Shu-Stream and Wood point, the channel's horary point and the Confluent Point of the Girdling Vessel. Qiu Xu GB-40 at the ankle is the Yuan-Source point. Yang Fu GB-38 on the lower leg is the Jing-River and Fire point and the channel's sedation point. Yang Ling Quan GB-34 below the knee is the He-Sea and Earth point and the Hui-Meeting Point of the Sinews. Zhi Yin BL-67 on the little toe and Li Dui ST-45 on the second toe are the Jing-Well points of the other two yang channels of the foot, and the three are used together as a group. Tou Qiao Yin GB-11 on the head shares this point's core name and is the reason for the "foot" prefix. All of these are held in this library and all were queried.

Source: Sacred Lotus sources & references (name, translation, channel, the Jing-Well & Metal classification, the whole Gall Bladder element column, the complete twelve-point Jing-Well set, and the GB-11, GB-15, GB-34, GB-38, GB-40, GB-41, GB-43, ST-45, BL-67, LU-11, LIV-01 and Shi Xuan records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 464; Chinese Acupuncture & Moxibustion, p. 221; Nan Jing (Classic of Difficulties), chapters 64, 68 and 69, on the five-shu elements and the mother-child rule; Ling Shu (Spiritual Pivot), chapter 1; PMID 31930896; PMID 34628737; PMID 29354970; PMID 26311288; PMID 32394666 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.