REN-22 (Tian Tu) Celestial Chimney

What does REN-22 Tian Tu do?

Tian Tu REN-22 sits in the hollow at the top of the breastbone and its recorded work is to send rebellious qi downward — settling cough and wheezing, and freeing the throat and the voice. Sacred Lotus sources & references record exactly those two actions and classify the point three ways: it lies on the Conception Vessel (Ren Mai), it is a Meeting Point of the Conception and Yin Linking (Yin Wei) Vessels, and it is a Point of the Window of Heaven. Its clinical range follows the anatomy immediately beneath and above it: the windpipe, the gullet, the larynx and the upper chest.

• Descends rebellious qi and alleviates cough and wheezing — the primary recorded action. Qi that rises when it should fall is the classical explanation for cough, asthmatic breathing, hiccup and belching, and this is the point on the front midline where that rising is met head-on.
• Benefits the throat and the voice — the second recorded action, for a sore, swollen or obstructed throat, for sudden loss of voice, and for the sensation of something lodged in the throat that will neither swallow nor come up.
• Resolves phlegm and frees the chest — the action behind its use where breathing is noisy, congested and rattling rather than merely tight. The classical literature treats REN-22 as a phlegm point of the upper burner.
• Dissipates swelling and nodules of the neck — the recorded basis for its classical use in goitre and in the chains of hard neck nodules the classics call scrofula.
• Regulates the passage between chest and head — the Window of Heaven action. That grouping is defined by governing what travels between the trunk and the head, and REN-22 is the set's point on the front midline, at the exact junction of the two.
• Joins the Conception Vessel to the Yin Linking Vessel — the Yin Wei is the extraordinary vessel that links the yin channels of the body; REN-22 and Lian Quan REN-23 above it are the two points where Sacred Lotus sources & references record that meeting on the Conception Vessel.

Source: Sacred Lotus sources & references (existing action record; Conception Vessel channel, Yin Linking meeting-point and Window of Heaven classifications queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 522); Chinese Acupuncture & Moxibustion (p. 240); cross-referenced against multiple online sources.

What is REN-22 Tian Tu used for?

Tian Tu REN-22 is used for the breath and the throat — cough, wheezing, a sore or blocked throat, loss of voice and difficulty swallowing. 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, and this point carries the significant safety facts set out under needling.

• Asthma, wheezing and shortness of breath
• Cough, including cough with copious or difficult phlegm
• Sore, swollen and painful throat
• Dry throat
• Sudden hoarseness or loss of the voice
• Difficulty in swallowing
• The sensation of an obstruction in the throat
• Hiccup
• Goitre and swelling at the front of the neck
• Scrofula — chains of hard nodules in the neck
• Fullness and oppression of the chest
• Sudden inability to speak following stroke
• Rebellious qi rising into the throat

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 522); Chinese Acupuncture & Moxibustion (p. 240).

Where is REN-22 Tian Tu, and how is it used in practice?

Tian Tu lies on the front midline of the body in the suprasternal fossa — the soft hollow you can feel at the very top of the breastbone, between the inner ends of the two collarbones. Sacred Lotus sources & references place it in the centre of that hollow, half a cun above the suprasternal notch itself. That is a small, well-defined landmark, which is why the point is easy to find; it is also directly above the windpipe and the top of the chest cavity, which is why it is one of the most anatomically demanding points on the body.

In practice REN-22 is treated as an acute, immediate-effect point rather than a constitutional one. The published reference literature describes it as a point of first resort in emergencies of the breath and the throat, using either needling or firm pressing, for asthmatic breathing, blocked phlegm, hiccup and sore throat, with the effect expected quickly (Zhongguo Zhen Jiu 2013;33(6):523–5, PMID 23967641). Pressing rather than needling is a genuine alternative here and is the technique a great deal of the modern literature on this point actually uses.

Which points is REN-22 combined with?

• For cough, wheezing and asthma — with Shan Zhong REN-17 below it in the centre of the chest, Fei Shu BL-13 on the upper back as the Lung's Back-Shu point, and Ding Chuan, the extra point held here beside the seventh cervical vertebra and directed specifically at wheezing. Data-mining of the ancient and modern literature on chronic cough places Fei Shu BL-13, Zu San Li ST-36, Da Zhui DU-14, Pi Shu BL-20 and Shan Zhong REN-17 among the highest-frequency points of that repertoire, with Tiantu recurring alongside them (Zhongguo Zhen Jiu 2025;45(9):1347–1359, PMID 40954069).
• For sore throat and loss of voice — with Lian Quan REN-23 above it at the top of the throat, the distal points Shao Shang LU-11 and He Gu LI-04, and Zhao Hai KI-06, the Confluent point most associated with a dry, painful throat.
• For goitre and neck nodules — with Qi She ST-11 and Shui Tu ST-10 on the neck beside it, Tian Ding LI-17, and Tian Jing SJ-10 at the elbow, the distal point classically associated with dissolving nodules.
• For hiccup — with Shan Zhong REN-17. A clinical report describes needling at Tiantu REN-22 combined with pressing at Danzhong REN-17 in 26 cancer patients with hiccup (Zhongguo Zhen Jiu 2014;34(8):746, PMID 25335246). It is a small uncontrolled series, and it is named here for the combination rather than as evidence of effect.
• For post-stroke difficulty swallowing — with Lian Quan REN-23, Shui Gou DU-26 and Feng Fu DU-16; this is the combination that dominates the modern clinical literature on the point.
• With Nei Guan P-06 — the Confluent point of the Yin Linking Vessel, which is the same extraordinary vessel REN-22 meets. The pairing is used for chest oppression, nausea and a constricted throat.

Where does REN-22 sit among the Window of Heaven points?

The Window of Heaven points are a small set named in the Ling Shu, sited almost entirely on the neck, understood as governing the passage of qi between the trunk and the head. Sacred Lotus sources & references hold ten points carrying this classification, and REN-22 is the only one on the front midline:

• Tian Zhu BL-10 — "Celestial Pillar", in the nape
• Feng Fu DU-16 — "Wind Mansion", on the midline of the nape
• Tian Fu LU-03 — "Celestial Storehouse", on the upper arm
• Tian Chi P-01 — "Celestial Pool", on the chest
• Tian Tu REN-22 — "Celestial Chimney", in the suprasternal notch. This page.
• Tian Chuang SI-16 — "Celestial Window", on the side of the neck
• Tian Rong SI-17 — "Celestial Countenance", below the angle of the jaw
• Tian You SJ-16 — "Celestial Window", behind the sternocleidomastoid
• Fu Tu LI-18 — "Protuberance Assistant", on the side of the neck
• Ren Ying ST-09 — "Man's Prognosis", beside the carotid pulse

Eight of the ten carry tian — heaven — in their names, and reading the set together makes the grouping's logic visible: these are the doors between the body and the head. It is worth noticing that three of the ten (REN-22, ST-09 and P-01) are among the most safety-constrained points on the body. That is not a coincidence — the neck and the root of the neck are where the traffic between trunk and head is narrowest, and that is exactly where the great vessels and the airway are too.

Source: Sacred Lotus sources & references (location, channel, Window of Heaven and Yin Linking classifications, and the full ten-point Window of Heaven set queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 522); Chinese Acupuncture & Moxibustion (p. 240); Ling Shu, on the Windows of Heaven; PMID 23967641; PMID 40954069; PMID 25335246; cross-referenced against multiple online sources.

Where is REN-22 located?

• A Manual of Acupuncture (p. 522): On the midline, in the centre of the suprasternal fossa, 0.5 cun superior to the suprasternal notch.
• Chinese Acupuncture and Moxibustion (p. 240): In the centre of the suprasternal fossa.

How is REN-22 Tian Tu needled, and why is it one of the most hazardous points on the body?

Stated plainly: REN-22 is among the highest-hazard points in the acupuncture repertoire. The technique the standard texts record is a two-stage one — a shallow perpendicular insertion, then the needle tip turned to travel downward behind the breastbone. That second stage takes the needle into the superior mediastinum, the space that holds the trachea, the great veins returning blood to the heart, the arch of the aorta and its branches, and the upper reflections of the pleura, with the lower pole of the thyroid immediately alongside. The whole of the safety literature on this point is about the second stage. Everything below is recorded as neutral reference data describing what the textbooks and the published dissection studies state. It is not instruction, and this page does not teach technique. Needling is carried out only by a qualified, licensed practitioner.

The two-stage angle and depth the texts record

• Sacred Lotus sources & references record the sequence exactly: first perpendicular insertion of 0.2 inch, then the needle tip directed downward along the posterior aspect of the sternum for 0.5 to 1.0 inch. Moxibustion is recorded as applicable.
• Deadman & Al-Khafaji (p. 522) and Chinese Acupuncture & Moxibustion (p. 240) record the same two-stage method and both attach an explicit caution to it. The recorded emphasis in both is that the needle must be kept against the back of the manubrium in the second stage rather than angled backward, because backward angling is what carries it toward the trachea and the vessels.
• The first stage is deliberately tiny. Two-tenths of an inch is among the shallowest initial depths recorded for any point in the repertoire, and its purpose is to get the needle through the skin without any downward travel before the direction is changed.
• Pressing instead of needling. The reference literature records firm pressure at this point as an alternative to needling for the same acute indications, and much of the modern published work on REN-22 uses pressure or transcutaneous stimulation rather than an inserted needle (PMID 23967641).

The measured anatomy — a dissection study that examined this point itself

The hazard here has been mapped directly, and this is one of the few points in the repertoire for which that is true.

• Cadaveric study of the needle path at Tiantu. A clinical anatomy study dissected 92 sides in 46 adult bodies, marking the needle paths at Tiantu REN-22 and Qishe ST-11 with steel needles and dissecting layer by layer. For Tiantu the finding concerned the left brachiocephalic (innominate) vein — the large vein that crosses behind the manubrium on its way to the heart. It lay at or close to the level of the upper edge of the manubrium in 43.5 per cent of bodies, and level with the middle of the manubrium in 56.5 per cent. The study also mapped the pleural reflection lines behind the manubrium, which met at the plane of the sternal angle in 50 per cent of specimens and at the plane of the first ribs in a further 6.5 per cent. The authors' conclusion was that needling at these two points can injure not only the upper pleural cavity but also the great vessels of the mediastinum and cervical root and the vagus nerve (Chen Y et al., Zhongguo Zhen Jiu 2007;27(2):120–2, PMID 17370496). The practical content of that finding is stark: in more than four bodies in ten, the great vein sat right at the top of the bone the needle is recorded as travelling behind.
• Cadaveric mapping of the pleural dome. A companion dissection study of the same 46 adult bodies mapped the dome of the pleura against the commonly used points around it, naming Tiantu REN-22 explicitly alongside Qishe ST-11, Jianjing GB-21, Dingchuan EX-B1 and Dazhu BL-11. The dome's projection varied widely between individuals, extending beyond the medial third of the clavicle in almost 60 per cent of bodies. The authors concluded that when a point is located and angled as the standard describes the pleura is not reached — but that exceeding the recorded depth breaches the pleural membrane (Chen Y et al., Zhongguo Zhen Jiu 2006;26(5):346–8, PMID 16739850).
• Individual variation is the theme of both studies. Neither found a single fixed relationship between the point and the structures beneath it. That is why the recorded depth functions as a conservative ceiling rather than a target, and why the texts describe the direction of travel — hard against the back of the bone — as carefully as the distance.

What research at this point has actually done, and why it belongs in the safety section

A point worth stating plainly, because it is easy to misread the clinical literature: several published trials at REN-22 used insertion depths far beyond the textbook figure, under hospital conditions and specialist supervision. A randomised trial of 70 patients with post-stroke dysphagia used what the authors call deep acupuncture of CV-22 — insertion of about 80 mm along the posterior margin of the manubrium, with repeated lifting and thrusting until the patient reported a sensation of obstruction (Zhen Ci Yan Jiu 2019;44(1):47–50, PMID 30773862). A second trial of 100 patients used an awn-like (elongated) needle at Tiantu (Zhongguo Zhen Jiu 2016;36(10):1019–1022, PMID 29231518), and a third randomised 71 patients to elongated versus regular needling at the same point (Zhongguo Zhen Jiu 2014;34(11):1089–92, PMID 25675570). Eighty millimetres is roughly three inches — three times the deepest figure our own reference record carries. These are recorded here as facts about what the research literature describes, in a hospital research setting, and emphatically not as a depth attaching to ordinary practice.

What is documented, and in what proportion

Pneumothorax and mediastinal injury. A punctured lung is the second most frequently reported serious adverse event in acupuncture. A systematic review of the Chinese case-report literature from 1956 to 2010 identified 1,038 adverse-event cases across 167 articles, of which 307 were pneumothorax, behind only fainting, with 35 deaths recorded across the whole series; the authors attributed the events chiefly to improper technique and judged most avoidable (He W et al., J Altern Complement Med 2012;18(10):892–901, PMID 22967282). A retrospective emergency-department series from a tertiary hospital in Seoul over five years recorded 12 mechanical complications of needling in the thoraco-abdominal region — ten pneumothoraces, one of them with air also in the mediastinum, and two cases of air in the abdominal cavity; eight patients required a chest drain and were admitted for a median of eleven days, and the mean interval between the treatment and arrival at the emergency department was 1.6 days (Lee HJ et al., Pain Med 2017;18(12):2504–2508, PMID 28431130). A separate systematic review of 115 Chinese-language articles reporting 479 adverse events including 14 deaths reached the same conclusion about traumatic complications (Zhang J et al., Bull World Health Organ 2010;88(12):915–921C, PMID 21124716, PMC2995190).

Delayed presentation is the specific danger. The Seoul series makes the point better than any warning could: the average patient arrived more than a day later. The reference literature records that a pneumothorax following needling at the root of the neck may declare itself hours afterward with sudden chest pain, breathlessness or a persistent dry cough, and is a medical emergency requiring immediate assessment.

What we will not claim. Despite an extensive search, we could not source a published case report naming REN-22 specifically as the point at which a fatal injury occurred, and no such claim is made here. Fatal outcomes from needling over the trunk do exist in the literature — an autopsy report describes bilateral pneumothoraces following electroacupuncture, the authors noting that electrical pulses and the muscle contraction they cause may draw needles deeper than the depth at which they were inserted (J Forensic Sci 2022;67(1):377–383, PMID 34435369) — but none of the reports we could verify identifies this point. The honest statement is the one the anatomy already makes: what lies beneath REN-22 is the trachea, the great veins and the pleura, and the recorded depth is bounded for that reason.

Risk in proportion. A meta-analysis of prospective clinical studies estimated serious adverse events in acupuncture at approximately 1 per 10,000 patients and around 8 per million treatments, placing it among the safer treatments in medicine (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268). Both statements are true together: the overall rate is low, and the events that do occur concentrate at a small number of points, of which REN-22 is one of the very few named repeatedly in the anatomical literature.

Source: Sacred Lotus sources & references (existing needling record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 522); Chinese Acupuncture & Moxibustion (p. 240); PMID 17370496; PMID 16739850; PMID 30773862; PMID 29231518; PMID 25675570; PMID 23967641; PMID 22967282; PMID 28431130; PMID 21124716 (PMC2995190); PMID 34435369; PMID 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Tian Tu mean?

Tian Tu means "Celestial Chimney" — tian, heaven or the celestial, and tu, a chimney, flue or projecting vent. Sacred Lotus sources & references translate it exactly that way. The image is precise rather than decorative: the head is the celestial region of the body, and this hollow at the top of the breastbone is the flue through which the breath rises to it and the smoke of turbid qi escapes. The name is also read as "Heavenly Prominence", which points at the same anatomy from the other direction — the point sits below the projecting knuckle of the larynx. A chimney is a thing that carries what rises upward and outward, and everything REN-22 is recorded as doing concerns exactly that traffic: breath, voice, phlegm and rebellious qi.

Why do REN-22's three classifications matter?

Most points carry one designation or none. REN-22 carries three, and each explains a different part of its indication list.

• It lies on the Conception Vessel (Ren Mai) — the great yin midline vessel of the front of the body, described as the "sea of the yin channels". That places REN-22 on the body's central axis rather than on any organ's channel, which is why its actions are described in terms of the direction qi travels rather than in terms of a single organ.
• It is a Meeting Point of the Conception and Yin Linking (Yin Wei) Vessels — the Yin Wei being the extraordinary vessel that links the yin channels together. Sacred Lotus sources & references record only two points on the Conception Vessel with this designation, REN-22 and Lian Quan REN-23 immediately above it, which is one reason the two are so often used as a pair for the throat. The Yin Wei's Confluent point is Nei Guan P-06 at the wrist — our library codes the Pericardium channel P-06 — and pairing REN-22 with P-06 treats the same vessel from its meeting point and its opening point at once.
• It is a Point of the Window of Heaven — the set concerned with what passes between the trunk and the head. This is the classification that explains why a point in the chest wall is used for the voice, for sudden speechlessness and for a throat that will not open: it is not treating four organs, it is treating one junction.

Is there research on REN-22 Tian Tu?

REN-22 is unusual among safety-constrained points in having a real point-specific clinical literature as well as an anatomical one — and the clinical work clusters almost entirely on one subject: difficulty swallowing after stroke.

• Post-stroke dysphagia — the largest body of work. A randomised trial allocated 70 patients with post-stroke dysphagia to deep needling of CV-22 with swallowing rehabilitation, or to conventional acupuncture at Lianquan CV-23, Fengfu GV-16, Bailao EX-HN23, Renying ST-09 and an extra point beside CV-23, also with rehabilitation, over three weeks. Effective rates were reported as 88.57 per cent against 74.29 per cent, with the CV-22 group better on the water-swallow test, the Fujishima scale and videofluoroscopic scoring (Zhen Ci Yan Jiu 2019;44(1):47–50, PMID 30773862). A second trial randomised 100 patients with dysphagia after cerebral infarction to an awn-like needle at Tiantu alone versus a multi-point filiform protocol with three-edged needle pricking (Zhongguo Zhen Jiu 2016;36(10):1019–1022, PMID 29231518). A third randomised 71 patients with dysphagia from bulbar palsy to elongated versus regular needling at Tiantu on top of the same base protocol, reporting effective rates of 97.2 per cent against 77.1 per cent (Zhongguo Zhen Jiu 2014;34(11):1089–92, PMID 25675570). These are single-centre, unblinded trials with active rather than placebo comparators, published in Chinese, and the very high reported effective rates should be read with that in mind — but all three test this point against an alternative, which is more than most points in the repertoire can show.
• Globus — a crossover trial with a sham control. Eighty patients with globus pharyngeus, the persistent sensation of a lump in the throat, were randomised in a single-blind crossover design to transcutaneous electroacupuncture at CV-22, LI-03, LU-11 or ST-36, each against sham stimulation. Symptom scores improved significantly more with real stimulation than sham at CV-22 and at LU-11 (CV-22: 13.5 ± 13.09 versus 1 ± 9.68, P < 0.002), while heart-rate-variability and neuropeptide changes distinguished LU-11 from the other points; the authors suggested CV-22 works by direct local action on the throat (Zhou W et al., Front Med (Lausanne) 2020;7:179, PMID 32528966, PMC7247858). This is the best-designed study we could find at this point, and its result is specific to it.
• The anatomical literature. The two cadaveric studies described under needling — the 92-side dissection of the needle path at Tiantu and Qishe (PMID 17370496) and the pleural-dome mapping that names Tiantu (PMID 16739850) — are genuinely point-specific and are the most consequential research attached to this point.
• Where the point appears without being tested. REN-22 recurs constantly in multi-point protocols for asthma, chronic obstructive lung disease, cough and acupoint-application ("summer treatment of winter disease") therapy, and in point-selection data-mining studies of the cough literature (PMID 40954069). Those measure protocols, not this point, and are not cited here as evidence about it.

What is missing should be said plainly: there is no large multicentre randomised trial of REN-22, no placebo-controlled trial for its central traditional indications of cough and wheezing, and the dysphagia trials that do exist are modest in size and were not blinded.

How does REN-22 compare with the points around it?

Lian Quan REN-23 lies above it at the top of the throat, is the other Conception Vessel meeting point with the Yin Linking Vessel, and shares its throat, voice and swallowing indications; the two are the standard front-midline pair for the throat, with REN-23 reaching the tongue and root of the tongue and REN-22 the windpipe and upper chest. Shan Zhong REN-17 lies below in the centre of the chest, is the Hui-Meeting point of qi and the Front-Mu of the Pericardium, and is REN-22's partner wherever the chest as a whole is congested. Qi She ST-11 sits lateral to REN-22 at the root of the neck, shares its throat and goitre indications, and was dissected in the same study — it carries the same order of hazard for the same reason. Ren Ying ST-09 higher on the neck beside the carotid pulse is the other heavily cautioned Window of Heaven point. Que Pen ST-12 in the hollow above the collarbone is the point in this region most explicitly recorded as prohibited from deep needling. Distally, Lie Que LU-07 — the Confluent point of the Conception Vessel — is the safe point that reaches the throat and the front midline from the wrist, and where a treatment can be done from a distance it usually is.

Source: Sacred Lotus sources & references (name, translation, all three classifications, the Window of Heaven set, the Yin Linking meeting points and the neighbouring point records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 522); Chinese Acupuncture & Moxibustion (p. 240); Ling Shu, on the Windows of Heaven; PMID 30773862; PMID 29231518; PMID 25675570; PMID 32528966 (PMC7247858); PMID 17370496; PMID 16739850; PMID 40954069 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.