P-08 (Lao Gong) Palace of Toil

What does P-08 Lao Gong do?

Lao Gong P-08 is the Ying-Spring and Fire point of the Pericardium channel of Hand Jue Yin, and the tradition's principal point for clearing fire from the Pericardium and the Heart. The classification carries the logic. Ying-Spring points are the heat-clearing members of the five-shu set, and on a yin channel the Ying-Spring point falls on Fire. The Pericardium is itself a Fire channel, so P-08 is the Fire point of a Fire channel — its horary point, and the most directly heat-targeted point it has. Sacred Lotus sources & references also record P-08 as one of Sun Si-miao's Ghost points.

• Clears heat from the Pericardium and revives consciousness — the defining action. In the classical doctrine of febrile disease, heat that penetrates inward is said to "invade the Pericardium", producing high fever with delirium, agitation and clouded consciousness; P-08 is the distal point named for that stage.
• Clears heat from the Heart and calms the spirit — for the restless, agitated, manic or fearful presentations the tradition attributes to Heart fire, and for the mouth and tongue signs that go with them.
• Harmonises the Stomach and clears heat from the middle burner — for nausea, vomiting, foul breath and burning epigastric discomfort, on the classical link between the Pericardium channel and the interior.
• Clears the nutritive level and cools the blood — the four-level doctrine of warm disease places ying, the nutritive level, immediately outside the blood; P-08 is a point named at that depth of penetration, where heat begins to show in the tongue body and in bleeding or rashes.

The point's most everyday use follows straight from all four: mouth and tongue ulcers. In channel terms these are read as Heart and Pericardium fire surfacing at the mouth, and P-08 is the distal point reached for to drain it. Sweaty, hot palms — the "five centres heat" of the classical description, meaning the two palms, the two soles and the chest — are attributed to the same fire and are the other presentation that brings a practitioner to this point.

Source: Sacred Lotus sources & references (channel, five-shu, element and Ghost-point classifications, and the recorded actions above — the broken list markup in that record corrected here); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 380; Chinese Acupuncture & Moxibustion, p. 201; cross-referenced against multiple online sources.

What is P-08 Lao Gong used for?

Lao Gong P-08 is used above all for mouth ulcers and foul breath, for the agitated and disordered mental presentations the tradition attributes to Heart fire, and for nausea and vomiting. The indications recorded in Sacred Lotus sources & references group into a mental-emotional set, an oral and digestive set, and a small local set at the hand. They describe traditional use, not proven treatment.

• Mental disorder and agitation
• Epilepsy
• Cardiac pain and chest oppression
• Mouth and tongue ulcers
• Foul breath
• Nausea and vomiting
• Gastritis and burning epigastric pain
• Febrile disease with delirium or clouded consciousness
• Fungal infection of the hand and foot
• Hot, sweaty palms

Two of these are worth reading against each other. "Mental disorder" and "epilepsy" belong to the point's standing as a Ghost point — the classical group for disturbed and frightening mental states, discussed under notes below. "Fungus infection of the hand and foot" is a purely local indication drawn from the point's position in the centre of the palm and has nothing to do with the channel theory at all; the library records it because the source texts record it.

Source: Sacred Lotus sources & references (existing indication record, reformatted here as a list); Chinese Acupuncture & Moxibustion, p. 201; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 380.

How is P-08 Lao Gong used in practice?

Lao Gong sits in the centre of the palm, between the second and third palm bones and close to the third — the spot the tip of the middle finger touches when a loose fist is made. That gesture is how it is found, and it is one of the few points on the body a patient can locate on themselves at first attempt. Our two sourced location records agree on the space and differ only in emphasis, one describing the point by the fist gesture and the other by its position just proximal to the knuckle joint on the radial side of the third palm bone.

Classic combinations

• With P-07 Da Ling — the point immediately proximal at the wrist crease, the Yuan-Source and Shu-Stream point of the same channel, and like P-08 a Ghost point. The pair is the Pericardium channel's own combination for agitation, chest heat and disordered mental states. P-07 is held here.
• With HT-08 Shao Fu — the Heart channel's Ying-Spring and Fire point, one palm space over. The two clear fire from neighbouring channels and are used together where Heart and Pericardium heat present as one picture. HT-08 is held here.
• With DU-26 Shui Gou — the classical pairing for collapse and loss of consciousness, joining the point below the nose to the point in the palm. Both are Ghost points and both are held here.
• With P-09 Zhong Chong — the Jing-Well point at the tip of the middle finger, added for the acute, high-fever, delirious presentations where the Jing-Well point is the more forceful choice. P-09 is held here.
• With REN-24 Cheng Jiang and ST-06 Jia Che — for mouth ulcers and foul breath, joining the local points at the mouth and jaw to the distal fire-clearing point. Both are held here, and both are also Ghost points.
• With KI-01 Yong Quan — the mirror-image pairing that the naming itself invites: Yong Quan sits at the centre of the sole as Lao Gong sits at the centre of the palm, and the two are used together for the "five centres heat" presentation and in the qigong and tuina traditions for drawing heat downward.
• With P-06 Nei Guan — the channel's Connecting point and confluent point of the Yin Linking Vessel, two cun above the wrist. P-06 does the general work of the channel for chest, stomach and nausea; P-08 is added where the picture is specifically hot. P-06 is held here.

Its role 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. Among the Ying-Spring and Fire points of the yin channels — a set that also includes LU-10 Yu Ji, SP-02 Da Du, HT-08 Shao Fu, KI-02 Ran Gu and LIV-02 Xing Jian — Lao Gong and Shao Fu are the two whose own channel is Fire, which is what makes each of them a horary point. Of that pair, Lao Gong is the one weighted toward the mouth, the mind and the palm; Shao Fu toward palpitations and the urinary and genital heat signs. As a group the palm and sole "centre" points are also the ones most used outside needling altogether — in tuina, in self-massage and in qigong practice — because they can be reached and pressed without any equipment.

Source: Sacred Lotus sources & references (location, categories, and the P-06, P-07, P-09, HT-08, DU-26, REN-24, ST-06 and Ghost-point records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 380; Chinese Acupuncture & Moxibustion, p. 201; cross-referenced against multiple online sources.

Where is P-08 located?

• A Manual of Acupuncture (p. 380): Between the second and third metacarpal bones, proximal to the metacarpo-phalangeal joint, in a depression at the radial side of the third metacarpal bone.
• Chinese Acupuncture and Moxibustion (p. 201): At the center of the palm, between the 2nd and 3rd metacarpal bones, but close to the latter, and in the part touching the tip of the middle finger when a fist is made.

How is P-08 Lao Gong needled in the textbooks?

Reference record only — this documents what the standard texts state, not instruction for a reader. Chinese Acupuncture & Moxibustion (p. 201) records perpendicular insertion of 0.3–0.5 cun at P-08, with moxibustion noted as applicable, and Sacred Lotus sources & references carry the same figures. Deadman & Al-Khafaji (p. 380) record a comparable shallow perpendicular range. The point is characteristically very sensitive, and the reference literature says so.

• Angle documented: perpendicular.
• Depth documented: approximately 0.3–0.5 cun — shallow, as the five-shu points of the extremities generally are, and here bounded by the thickness of the palm rather than by any organ risk.
• Moxibustion: documented as applicable. It is used sparingly at a heat-clearing point, but the one randomised trial that studies P-08 on its own uses an indirect moxibustion technique at this point (see below).
• Sensation: the palm is among the most densely innervated skin on the body and this point is recorded across the reference literature as notably painful. That is a fact about the point rather than a hazard, and it is the reason P-08 is often stimulated by pressure rather than by needle in practice.

Safety reference, and the measured anatomy

Stated plainly: P-08 lies in the middle of the palm, with no body cavity, no organ and no major artery beneath it. It carries no pneumothorax risk, no organ-puncture risk and no recorded pregnancy contraindication, and it sits at the low-hazard end of the point repertoire. What it does sit on is nerve tissue, and that has been measured directly.

• Cadaveric dissection of PC8 itself. A study at Chungnam National University College of Medicine dissected the PC8 site in two cadavers to establish its relationship to the surrounding nerves, muscles and tendons. It found a palmar digital nerve — a branch of the median nerve — in the superficial layer at the point, and the deep branch of the ulnar nerve, innervating adductor pollicis, in the deep layer of the palm beneath it. The authors concluded that stimulation at PC8 can activate median and ulnar territory simultaneously (Kim SH et al., Complement Ther Clin Pract 2025;60:101993, PMID 40300363, DOI 10.1016/j.ctcp.2025.101993). Two specimens is a small series, but this is measured anatomy at this exact point, and it explains both the intensity of the sensation the texts describe and the shallow depth they record: what the point is understood to act on lies superficially.
• Innervation density, animal. A rat study mapped substance P-positive sensory nerve fibres in the skin at the sites corresponding to the Pericardium channel's five-shu points and found fibre density significantly higher at PC 9 and PC 8 than at PC 7, PC 5 or PC 3 (P < 0.01), decreasing from the fingertip proximally (Zhen Ci Yan Jiu 2016;41(4):298–302, PMID 29071923). Animal work, but consistent in direction with the human dissection above.
• Risk in proportion. A meta-analysis of prospective clinical studies estimated serious adverse events across all acupuncture at approximately 1 per 10,000 patients, with about half of all recorded events being bleeding, pain or flare at the needle site (BMJ Open 2021;11:e045961, PMID 34489268). P-08 belongs firmly at the low-hazard end of that distribution; its documented drawback is discomfort, not danger.

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

Source: Chinese Acupuncture & Moxibustion, p. 201; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 380; Sacred Lotus sources & references (existing needling record); PubMed PMID 40300363, 29071923, 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Lao Gong mean?

Lao Gong means "Palace of Toil" — lao, labour, toil or exhaustion, and gong, a palace. The reading is direct: the palm is where the hand does its work, so the centre of the palm is the "palace" — the central chamber — of labour. Commentators extend it in two directions. One takes lao as the toil of the hands and reads the point as the seat of physical exertion. The other takes lao in its medical sense of taxation or consumptive exhaustion, the depletion produced by overwork, and reads the point as where that exhaustion is addressed. Both readings are traditional and the site does not choose between them. The gong character matters too: a palace, in point naming, marks an interior chamber of importance — the same character appears in Zi Gong REN-19, "Purple Palace", on the chest, which the library also holds.

Where does Lao Gong sit among the five-shu points?

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 begins, 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.

The element assignment then depends on whether the channel is yin or yang. On yang channels the Ying-Spring point is a Water point — which is why ST-44 Nei Ting, held here, is Water on the Earth channel of the Stomach. On yin channels the Ying-Spring point is a Fire point. The Pericardium is a yin channel whose own element is Fire, so Lao Gong is a Fire point on a Fire channel: what the five-element tradition calls the horary or self point. Only one point per channel holds that position.

The Pericardium channel's five-shu and category points held in this library are P-09 Zhong Chong (Jing-Well, Wood), P-08 Lao Gong (Ying-Spring, Fire), P-07 Da Ling (Shu-Stream, Earth, and the channel's Yuan-Source point), P-05 Jian Shi (Jing-River, Metal) and P-03 Qu Ze (He-Sea, Water), with P-06 Nei Guan as the Connecting point and confluent point of the Yin Linking Vessel and P-04 Xi Men as the Cleft point.

Is Lao Gong the sedation point of the Pericardium channel?

No — and this is the single distinction students most often get wrong at this point. Being the Fire point does not make Lao Gong the channel's five-element sedation point. The sedation point of a channel is its child element, and the child of Fire is Earth, so P-07 Da Ling — the Shu-Stream and Earth point — is the Pericardium channel's sedation point. The tonification point is the mother, Wood, which is P-09 Zhong Chong, the Jing-Well and Wood point. Both classifications are carried in Sacred Lotus sources & references and both points are held here.

The confusion arises because P-08 has an unmistakable fire-clearing reputation and it is natural to assume that a point which drains fire must be the fire channel's sedation point. It is not. Its heat-clearing standing rests on the Ying-Spring indication from the Nan Jing and on centuries of direct clinical record, not on the mother–child rule. Exactly the same trap exists one channel over on the Heart, where HT-08 Shao Fu is the Fire point but HT-07 Shen Men is the sedation point; our HT-08 record sets it out the same way, and our LIV-02 Xing Jian record shows the correct case on the Liver, where the Ying-Spring point is Fire, the channel is Wood, and Fire is genuinely the child — so there LIV-02 is the sedation point. The rule is consistent; only the arithmetic of each channel's element changes.

Why is Lao Gong a Ghost point?

Sun Si-miao, the seventh-century physician and author of the Qian Jin Yao Fang, set out a group of thirteen "Ghost points" — gui xue — for the treatment of madness, seizures and the frightening, disordered mental states classical medicine described as possession. In each name the character gui, ghost, was substituted for the point's usual name; Lao Gong appears in that list as Gui Ku, "Ghost Cave". The group was needled in a fixed sequence, and its survival into modern practice is the reason "mental disorder" and "epilepsy" sit in this point's indication list beside mouth ulcers and nausea.

Sacred Lotus sources & references record twelve points as Sun Si-miao Ghost points: LU-11 Shao Shang, SP-01 Yin Bai, P-07 Da Ling, P-08 Lao Gong, BL-62 Shen Mai, DU-16 Feng Fu, DU-23 Shang Xing, DU-26 Shui Gou, REN-01 Hui Yin, REN-24 Cheng Jiang, LI-11 Qu Chi and ST-06 Jia Che. Note that the Pericardium channel contributes two of them, P-07 and P-08, adjacent to each other — no other channel does, which is a comment in itself on how the tradition regarded this channel's relationship to the mind.

Is there research on P-08 Lao Gong?

P-08 has little point-specific clinical research, but what exists is unusually well aimed: one randomised trial in which the point is the tested variable, and one cadaveric anatomical study of the point itself. The rest is protocol research in which P-08 is one point among many, and mechanism work using the point as a convenient site.

• Randomised controlled trial with P-08 as the intervention site. Seventy-four pre-dialysis uraemic patients who had just had a distal forearm radial-cephalic arteriovenous fistula created were randomised to handgrip exercise or to moxibustion at Laogong partitioned with Panax notoginseng, both for twelve weeks with follow-up to twenty-four. The maturity rate of the fistula was significantly higher in the moxibustion group at four weeks, with greater draining-vein and brachial-artery diameter and flow at two and twelve weeks, lower serum endothelin and higher nitric oxide at two weeks; the long-term patency benefit at twenty-four weeks was not significant (Chen Y et al., Chin Med 2022;17(1):49, PMID 35443733, PMC9019999, DOI 10.1186/s13020-022-00604-9, ChiCTR1900024042). Read it carefully: it is a registered randomised trial at this point alone, but the indication is a modern one with no classical basis, and the negative long-term result is reported by the authors themselves.
• Cadaveric anatomy of the point. The dissection study described under needling above identified a palmar digital branch of the median nerve superficially at PC8 and the deep branch of the ulnar nerve beneath, concluding that the point can engage both nerves at once (PMID 40300363). This is the most useful measured finding available for P-08.
• Honest negative result on point specificity. A study measuring skin electrical impedance around twelve source points found that while some points — Yang Chi SJ-04, for instance — showed a sharply defined low-impedance centre up to sixteen times lower than the surrounding skin, Lao Gong PC 8 showed no impedance difference from the tissue around it. The authors concluded that not all acupoints share the low-impedance property (J Tradit Chin Med 2018;38(2):287–298, PMID 32186068). That is a null finding at this point and it is recorded here as such.
• Ghost-point protocol, randomised trial. A randomised controlled trial treated mild perimenopausal depression with acupuncture at the "thirteen ghost points" plus a herbal formula (Zhongguo Zhen Jiu 2020;40(3):267–271, PMID 32270639). P-08 is a member of the tested group but not the tested variable, and the trial cannot show what any single point contributed.
• Animal network meta-analysis. A systematic review and network meta-analysis of 29 randomised animal studies in 659 rats with vascular dementia found manual acupuncture improved cognitive performance against the model condition and identified a multi-point regimen — DU-04, DU-14, DU-16, DU-20, DU-24, DU-26, P-06, P-07 and P-08 — as the best performing overall (Song Y et al., Syst Rev 2025;14(1):80, PMID 40186311, PMC11971794). This is a synthesis of animal trials, and P-08 is one point in a nine-point regimen.

What is missing should be said plainly: there is no clinical trial testing P-08 for any of the uses the tradition actually claims for it — mouth ulcers, Heart fire, agitation or collapse. The one trial that isolates the point studies fistula maturation. Where this point is concerned, the strongest thing that can be said from the modern literature is anatomical, not clinical.

How does Lao Gong differ from the points near it?

HT-08 Shao Fu is the closest point of comparison and the one most often confused with it. It is the Heart channel's own Ying-Spring and Fire point, it also lies in the palm one bone space over — between the fourth and fifth palm bones — and it too is found by making a fist, this time where the little finger touches. The two are found by the same gesture and clear heat from neighbouring channels; Lao Gong is weighted toward mouth ulcers, mental restlessness and sweaty palms, Shao Fu toward palpitations and the urinary and genital heat signs. P-07 Da Ling lies proximal at the middle of the wrist crease and is the Yuan-Source, Shu-Stream and Earth point — the sedation point discussed above, and P-08's constant partner. P-09 Zhong Chong is at the tip of the middle finger, the Jing-Well and Wood point, the more acute and reviving choice. SJ-03 Zhong Zhu lies on the back of the same hand between the same two bones, on the paired yang channel — a different point entirely, despite the shared interosseous space. And the extra point group Ba Xie, held here, occupies the webs between the fingers on the dorsum, not the palm. All of these are held in Sacred Lotus sources & references.

Source: Sacred Lotus sources & references (name, categories, Ghost-point set and the P-03 to P-09, HT-08, LIV-02, ST-44, SJ-03 and Ba Xie records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 380; Chinese Acupuncture & Moxibustion, p. 201; Nan Jing (Classic of Difficulties), on the five-shu indications; Sun Si-miao, Qian Jin Yao Fang, on the Ghost points; PubMed PMID 35443733 (PMC9019999), 40300363, 32186068, 32270639, 40186311 (PMC11971794), 29071923 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.