GB-43 (Xia Xi) Pinched Ravine

What does GB-43 Xia Xi do?

Xia Xi GB-43 is the Ying-Spring and Water point of the Gall Bladder channel of Foot Shao Yang, and the tradition's principal distal point for clearing heat out of the head — for one-sided headache, for the ear, and for the outer corner of the eye. The classification is the explanation. Ying-Spring points are the heat-clearing members of the five-shu set, and the Gall Bladder channel is the channel that runs in zig-zags over the side of the head, encircles the ear and reaches the outer canthus. A heat-clearing point at the far end of that channel is exactly what the tradition wants for a hot, throbbing, one-sided head.

• Clears heat and benefits the head, ears and eyes — the defining action recorded in our own sources. It is the recorded basis for its use in one-sided headache, in dizziness and vertigo, in tinnitus and deafness, in pain at the outer corner of the eye and in swelling of the cheek.
• Clears damp-heat from the channel and reduces swelling — the second recorded action, and the one behind its use for swelling of the face and jaw, for hot painful swelling along the channel, and for the classical listing under febrile disease.
• Spreads Gall Bladder qi in the chest and hypochondrium — the extension of the same action into the trunk, and the reason a point on the foot is recorded for pain between the ribs and for distending pain of the breast. The Gall Bladder channel runs down the side of the trunk, and Shao Yang pathology is characteristically lateral.
• Calms rising yang — the tradition's account of the irritable, hot-headed, one-sided presentation the point suits: heat rising along a yang channel to the head, which a distal Water point on that channel is used to draw back down.

Note what GB-43 is not. It carries no yuan, luo, xi-cleft, back-shu, front-mu or confluent classification in our records — its element assignment is its entire formal identity, and everything above follows from it.

Source: Sacred Lotus sources & references (channel, Ying-Spring and Water classification, existing action record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 462); Chinese Acupuncture & Moxibustion (p. 221); cross-referenced against multiple online sources.

What is GB-43 Xia Xi used for?

Xia Xi GB-43 is used above all for one-sided headache and for disorders of the ear — tinnitus and deafness — together with pain at the outer corner of the eye and swelling of the cheek. The indications below are those carried in Sacred Lotus sources & references together with those set out in the standard reference literature. They describe traditional use, not proven treatment.

• Headache, characteristically one-sided and at the temple
• Dizziness and vertigo
• Tinnitus — ringing in the ears
• Deafness and sudden loss of hearing
• Pain of the outer canthus — the outer corner of the eye
• Redness and swelling of the eye
• Swelling and pain of the cheek and jaw
• Swelling of the submandibular region and of the neck
• Pain in the hypochondriac region — between and below the ribs
• Distending pain of the breast
• Febrile disease with no sweating
• Irritability, agitation and disturbed sleep attributed to rising yang
• Pain and swelling of the top of the foot

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 462); Chinese Acupuncture & Moxibustion (p. 221).

Where is GB-43 Xia Xi, and how is it used in practice?

Xia Xi lies on the top of the foot, in the cleft between the fourth toe and the little toe, just behind the edge of the web — Deadman & Al-Khafaji place it half a cun back from the web margin, at the junction of the darker and paler skin. It is a small, characteristically tender point, and it is easily found by sliding a fingertip back along the groove between the last two toes until it drops into the hollow.

Which points is GB-43 combined with?

• With Feng Chi GB-20 and Tai Yang — the standard one-sided headache treatment: local points at the temple and the base of the skull with GB-43 as the distal Gall Bladder point. This structure appears intact in the trial literature — a randomised study of body acupuncture with auricular acupressure for menstrual headache attributed to liver-fire used GV-20, GB-20, SP-06, LR-03, Xiaxi GB-43, Taiyang EX-HN5, GB-04, GB-05 and GB-08, which is that classical combination almost point for point (Zhen Ci Yan Jiu 2015;40(1):70–4, PMID 25845225).
• With Ting Hui GB-02, Yi Feng SJ-17 and Zhong Zhu SJ-03 — the classical ear combination: local points around the ear on the Gall Bladder and Sanjiao channels, with GB-43 distally. The two channels are the Shao Yang pair, and both encircle the ear.
• With Tai Chong LIV-03 — the Gall Bladder's paired yin channel Source point. GB-43 and LIV-03 together are the standard choice where the presentation is read as liver-fire rising: one-sided headache, red eyes, tinnitus and irritability.
• With Qiu Xu GB-40 — the Yuan-Source point of the same channel at the ankle; the Source-and-Ying-Spring pairing keeps the whole treatment on one channel.
• With Zu Lin Qi GB-41 — the Shu-Stream and Wood point immediately proximal on the same channel. Pairing the Shu-Stream and Ying-Spring points of a channel is a recognised classical selection method in its own right, and the two points sit within an inch of each other.
• With Yang Ling Quan GB-34 and Qi Men LIV-14 — for hypochondriac pain and breast distension, adding the He-Sea point of the channel and the Front-Mu point of the Liver.
• Method — Sacred Lotus sources & references record moxibustion as applicable, though for a heat-clearing point it is used sparingly in practice.

Where does GB-43 sit among its category peers?

Every channel has a Ying-Spring point, and as a group they are the heat-clearers of the five-shu scheme. Its closest relatives are the other Ying-Spring points of the toes, all held here: Nei Ting ST-44 in the second web is the Stomach's, for toothache and mouth heat; Xing Jian LIV-02 in the first web is the Liver's, for liver-fire; Da Du SP-02 is the Spleen's; and Tong Gu BL-66 is the Bladder's. GB-43 is the one of the group weighted toward the ear and the side of the head. Within its own channel it is one of the five transporting points, and Sacred Lotus sources & references carry the complete Gall Bladder series: GB-44 Zu Qiao Yin (Jing-Well, Metal), GB-43 Xia Xi (Ying-Spring, Water), GB-41 Zu Lin Qi (Shu-Stream, Wood), GB-38 Yang Fu (Jing-River, Fire) and GB-34 Yang Ling Quan (He-Sea, Earth), with GB-40 Qiu Xu as the channel's Yuan-Source point and GB-37 Guang Ming as its Luo-Connecting point.

Source: Sacred Lotus sources & references (location, five-shu and element classifications, and the full Gall Bladder and Ying-Spring point sets queried in the live point records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 462); Chinese Acupuncture & Moxibustion (p. 221); PMID 25845225; cross-referenced against multiple online sources.

Where is GB-43 located?

• A Manual of Acupuncture (p. 462): Between the fourth toe and the little toe, 0.5 cun proximal to the margin of the web.
• Chinese Acupuncture and Moxibustion (p. 221): On the dorsum of foot, between the fourth and fifth toe, proximal to the margin of the web, at the junction of the red and white skin.

How is GB-43 Xia Xi needled in the textbooks?

Reference record only — this documents what the standard texts state, not instruction for a reader. Sacred Lotus sources & references record perpendicular insertion of 0.3 to 0.5 inch at GB-43, with moxibustion noted as applicable. Deadman & Al-Khafaji record a comparable shallow range and additionally describe oblique insertion directed proximally along the channel for disorders of the foot itself.

• Angle documented: perpendicular; an oblique proximal variant is recorded for local foot problems.
• Depth documented: approximately 0.3–0.5 cun — a shallow point, as the five-shu points of the extremities generally are, because there is little tissue there to enter.
• Moxibustion: documented as applicable, though sparingly used at a heat-clearing point.

What lies beneath the point

This is a low-hazard point, and it is worth saying so directly rather than attaching a generic warning. GB-43 lies between the long bones of the foot, near the surface, with bone immediately deep to it. There is no lung, no body cavity, no viscus and no great vessel within reach of the recorded depth, and the standard references attach no special prohibition to it. It carries none of the anatomical exposure of Jian Jing GB-21 over the apex of the lung, of the points over the thorax, or of the abdominal points over the viscera. The structures that are present are the dorsal digital vessels and nerves running in the space between the toes, so bleeding and a sharp local sensation are the ordinarily documented occurrences.

The point is characteristically tender, and that has been measured: in a study of pain thresholds at named points on the leg and foot in 66 healthy volunteers, GB-43 had the highest pain threshold of the four Ying-Spring points of the toe webs tested — Da Du SP-02, Xing Jian LIV-02, Nei Ting ST-44 and Xia Xi GB-43 — with ST-44 the lowest (Zhen Ci Yan Jiu 2013;38(1):68–72, PMID 23650804). In plain terms, GB-43 is the least sensitive of that group, not the most.

No pregnancy contraindication is recorded for GB-43 in our sources or in the standard reference literature; among the points nearby that caution attaches to Jian Jing GB-21 and, on other channels, to LI-04 and SP-06. Standard clean-needle practice applies. For context rather than alarm: a meta-analysis of prospective clinical studies estimated serious adverse events from acupuncture at approximately 1 per 10,000 patients and around 8 per million treatments, and concluded that acupuncture is among the safer treatments in medicine (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268). Those events cluster at a small number of anatomically exposed points, and GB-43 is not among them. 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 (p. 462); Chinese Acupuncture & Moxibustion (p. 221); PMID 23650804; PMID 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Xia Xi mean?

Xia Xi means "Pinched Ravine" — xia, to be clasped, flanked or pinched between two things, and xi, a mountain stream or the narrow ravine it runs in. Both halves are descriptive at once. The point is pinched in the narrow cleft between the fourth toe and the little toe, and it lies in the ravine that the two long bones of the foot make on either side of it. The stream image is not decorative: it belongs to the five-shu scheme, in which channel qi is described as water rising from a well at the fingertip or toe-tip and growing as it flows inward. At the Ying-Spring point the water is a trickle in a narrow gully — which is exactly what the second character says.

Why does the Ying-Spring classification matter at GB-43?

The five-shu points run from the tip of each limb inward, and the classics assign each a stage in the flow of channel qi: Jing-Well where it wells up, Ying-Spring where it glides, Shu-Stream where it pours, Jing-River where it flows, He-Sea where it enters the deep. The Nan Jing attaches an indication to each stage, and the Ying-Spring point's is heat and febrile disease. That is why the Ying-Spring point of a channel is the standard place to go when the presenting problem is heat in that channel, and why GB-43 rather than any other Gall Bladder point is the one-sided-headache and hot-ear choice.

The element assignment sharpens it. On yang channels the five-shu points run Metal, Water, Wood, Fire, Earth from the toe upward, so the Ying-Spring point of a yang channel is always its Water point. Sacred Lotus sources & references record GB-43's classification as Ying-Spring & Water. A Water point on a channel whose characteristic pathology is fire rising to the head is the tradition's preferred instrument for damping it down.

Is GB-43 the tonification point or the sedation point of the Gall Bladder channel?

GB-43 is the tonification (mother) point of the Gall Bladder channel. The sedation (child) point is GB-38 Yang Fu, the Fire point. This is worth working out from first principles rather than taking on trust, because it is the single thing most often got backwards about this point — the heat-clearing role and the tonifying role sit in the same point and pull in opposite directions.

• The Gall Bladder is a Wood channel — a yang Wood channel, paired with the yin Wood channel of the Liver.
• In the generating cycle, Water produces Wood. So Water is the mother of Wood, and Wood produces Fire, so Fire is its child.
• Under the mother-child rule one supplements a channel through its mother point and drains it through its child point.
• Tonification (mother) point — GB-43 Xia Xi, the Ying-Spring and Water point. Water is the mother of Wood.
• Sedation (child) point — GB-38 Yang Fu, the Jing-River and Fire point. Fire is the child of Wood. Held in this library.

The distinction students commonly get wrong. Being the Ying-Spring point does not by itself make a point the sedation point — it depends entirely on the channel's own element. On the Liver, a yin Wood channel, the Ying-Spring point LIV-02 Xing Jian is the Fire point and therefore is the child and the sedation point. On the Gall Bladder, also a Wood channel but yang, the Ying-Spring point falls on Water instead — the mother — so the identical five-shu position produces the opposite role. On the Lung, a Metal channel, the Water point LU-05 Chi Ze is the child and so is the sedation point; on the Heart, a Fire channel, the Ying-Spring and Fire point HT-08 Shao Fu is Fire on Fire and is the horary point, neither mother nor child. Our LU-05, LIV-02 and HT-08 records make the same correction from their own sides. The rule to carry away is that the five-shu position tells you the classical indication, while the element's relationship to the channel tells you the tonification-sedation role, and the two coincide only by arithmetic.

How can one point clear heat and tonify? They are two independent overlays on the same point, not one claim. The Ying-Spring indication comes from the Nan Jing's stage-of-flow scheme; the mother-child role comes from five-element theory applied afterwards. In practice the two are separated by technique and by intent: GB-43 is used with draining stimulation as a heat-clearing point far more often than it is used as a tonification point, and the mother-point role belongs mainly to five-element styles of practice. Stating both, and saying which is used more, is more useful to a reader than picking one. Note also that its neighbour GB-41 Zu Lin Qi, the Shu-Stream and Wood point, is Wood on a Wood channel — the Gall Bladder's horary point — so three adjacent points on the same foot occupy three entirely different offices in the same scheme.

Is there research on GB-43 Xia Xi?

GB-43 has an unusual research position: it is one of a small handful of points chosen repeatedly by independent groups to test whether acupuncture points are specific at all, because of its traditional claim on the ear. The results conflict, and the honest report is that they conflict.

• Evidence for specificity — cortical auditory evoked potentials. A crossover study in ten healthy volunteers stimulated one of four points per session: SJ-03 and GB-43 (both claimed as specific for the auditory system in the tradition) and HT-07 and ST-44 as non-specific comparators. The mean peak latency of the P2 component fell by 11 ms after SJ-03 and by 14 ms after GB-43, while the N2 latency rose; stimulation at HT-07 and ST-44 produced no change (P < 0.05). The authors concluded that the findings confirmed the specificity of SJ-03 and GB-43 in relation to the auditory system (Lietz P et al., Acupunct Electrother Res 2008;33(1–2):1–8, PMID 18672740).
• Evidence for a central effect — laser acupuncture imaging. A functional magnetic resonance imaging study applied laser acupuncture at GB-43 on both feet, against a control condition in which the laser was mounted at the same points but not fired. Group results showed significant activation in the thalamus, subthalamic nucleus, red nucleus, brainstem and Brodmann areas 40 and 22 during stimulation, and none at all in the placebo condition; the activations were predominantly on the same side as the stimulation (Siedentopf CM et al., Lasers Med Sci 2005;20(2):68–73, PMID 15990948). Brodmann area 22 includes auditory association cortex, which is why this study is read as supporting the point's ear association.
• Evidence against — the same question, a harder test. A functional magnetic resonance imaging study of 20 healthy volunteers compared needling at GB-43 with a sham point and looked specifically at primary auditory cortex. Multi-subject analysis showed no significant activation in Heschl's gyrus for either GB-43 or the sham; in single-subject analysis, activation appeared in two of the 20. The authors stated plainly that they found no evidence for the specificity of GB-43 in relation to primary auditory activation, previously suggested by two independent research groups (Wesolowski T et al., Neuroreport 2009;20(2):116–20, PMID 19104454).
• Evidence against — brainstem level. A crossover study in ten volunteers measured brainstem auditory evoked potentials during needling at SJ-03, GB-43, HT-07 and ST-44. Peak latencies and amplitudes did not change from baseline at any point. The authors' conclusion was methodological rather than dismissive: monitoring brainstem auditory evoked potentials is not a suitable technique for studying immediate acupuncture effects (Usichenko TI et al., Acupunct Med 2011;29(3):215–20, PMID 21521742). Incidentally, in that study HT-07 was the most painful point and produced the most qi sensation — a reminder that the sensation a point gives is not a guide to what it does.
• Clinical — tinnitus. A randomised study allocated 101 patients with tinnitus of the excessive-liver-fire type to three arms: acupuncture with a twirling reducing manipulation, the identical points and insertion without the manipulation, or physical therapy with laser and ultrashort wave. The points were SI-19, GB-02, SJ-17, SJ-03, SJ-05, Xiaxi GB-43, LIV-03 and GB-40 — and the tested manipulation was applied specifically at GB-43 and LIV-03. Tinnitus severity and handicap scores fell in all three groups; the cured-and-markedly-effective rate was 71.4 per cent (25/35) in the manipulation arm against 42.4 per cent (14/33) with physical therapy (P < 0.05) (Zhongguo Zhen Jiu 2016;36(12):1263–1265, PMID 29231363). GB-43 is not isolated, but it is one of only two points carrying the variable under test, which is closer than most protocol trials get.
• Clinical — sudden hearing loss. A randomised study of 60 cases compared electroacupuncture at GB-02, SJ-17, LI-04, Xiaxi GB-43, SJ-03 and others against intravenous and oral medication, with blood-viscosity measures as outcomes (Zhongguo Zhen Jiu 2009;29(3):185–7, PMID 19358498). A multi-point protocol; recorded as documented clinical use of the point, not as evidence about it.
• Sensory measurement. The pain-threshold study described under needling measured GB-43 by name against the other Ying-Spring points of the toe webs (PMID 23650804).

The honest summary: two studies from the mid-2000s reported an auditory-specific effect at GB-43; a later and better-controlled imaging study by an overlapping group looked directly at primary auditory cortex and found none, and said so explicitly. The tinnitus trial is encouraging but small, single-centre and unblinded. There is no well-powered randomised trial isolating GB-43 for headache, for tinnitus or for anything else, and the site does not claim otherwise. What is genuinely notable is that a point on the fourth toe web has been thought worth this much investigation at all — which is a measure of how firmly the tradition attaches it to the ear.

How does GB-43 compare with the points around it?

The top of the foot is crowded, and GB-43's neighbours are easily confused with it. Zu Qiao Yin GB-44 lies at the corner of the fourth toenail and is the Jing-Well and Metal point — the more acute choice, and the one classically bled. Zu Lin Qi GB-41 lies proximal in the same intermetatarsal space and is the Shu-Stream and Wood point and the Confluent point of the Girdling Vessel — a far broader point, reaching the waist and the whole lateral body. Di Wu Hui GB-42 sits between them and is the least used of the group. Nei Ting ST-44 is GB-43's exact structural counterpart two webs over: another Ying-Spring and Water point on a yang channel, but on the Stomach, and weighted to toothache and mouth heat rather than the ear. Xing Jian LIV-02 in the first web is the Ying-Spring point of the paired yin channel and is the sedation point of the Liver — GB-43 and LIV-02 look alike and behave oppositely in the mother-child scheme. And Zhong Zhu SJ-03 on the hand is GB-43's partner across the Shao Yang pair: the other point named in every one of the auditory specificity studies above.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture (p. 462); Chinese Acupuncture & Moxibustion (p. 221); Sacred Lotus sources & references (name, element and five-shu classifications, and the full Gall Bladder, Ying-Spring and neighbouring point records queried in the live point records); Nan Jing (Classic of Difficulties), on the five-shu indications; PMID 18672740; PMID 15990948; PMID 19104454; PMID 21521742; PMID 29231363; PMID 19358498; PMID 23650804; PMID 25845225 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.