Light touch only; never press in between the ribs.
天池 Tianchi
“Heavenly Pool” · PC1
Hand Jueyin · 1 of 9
Where. In the rib space level with the nipple, one thumb-width outside it.
For. Cough; pain at the side of the ribs; low breast milk.
Press. A light fingertip touch on the surface, about a minute each side.
Caution. Light touch only; never press in between the ribs.
天池，一名天會，在乳後一寸按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Tianchi Sits on the Chest Wall
Tianchi occupies the outer slope of the chest, where the front of the torso begins its curve toward the armpit. The dataset places it in the fourth intercostal space — the fourth gap between ribs — one cun lateral to the nipple and five cun lateral to the anterior midline. A cun is the traditional proportional measure of Chinese point-location, taken from the body being examined rather than from a ruler; a thumb-width at the knuckle is the usual working equivalent. The two distance figures agree with each other neatly: surface-anatomy convention puts the nipple about four cun from the midline, so one further cun outward lands the point at five. And because proportional measures widen and narrow with the frame, broad adults carry wider cun than slight teenagers — which is why the landmarks matter more than any number.
What lies beneath the fingertips deserves respect. This is the territory of the pectoralis major and, toward the outside, the soft tissues where chest becomes armpit; beneath the muscle lie ribs separated by intercostal muscle and membrane. The fourth space sits well down the chest wall from the collarbone, yet it still roofs the pleural cavity, and the lung moves behind it with every breath. The licensed records treat that fact seriously — the caution attached to this point is unusually direct — and anyone practising self-care here should inherit the same seriousness. Nothing about finding or pressing Tianchi requires force; the landmarks announce themselves to patient, light touch, and gentle contact is the entire vocabulary this page recommends.
Tianchi is the first point of the pericardium channel, the place where that pathway surfaces before its long journey down the limb. Its neighbours help fix the position: the nipple provides the horizontal anchor one cun away, and the armpit hollow above marks the direction of lateral. The point sits at the meeting of the chest front and side — close enough to the breast region that classical discussions group it there, high enough that classical texts still speak of it alongside the armpit. Holding that double address in mind makes the search quicker: you are looking for the groove just beyond the nipple line, on the rounded slope where chest turns toward shoulder, not on the breastbone side and not tucked deep into the armpit.
A Self-Palpation Walkthrough
Stand or sit comfortably before a mirror with the shoulders released, so the chest muscles soften. Find the nipple on the side you mean to work on; in most adults it sits roughly level with the fourth intercostal space already, which makes it an honest anchor. Rest the pads of your index and middle fingers just beside the nipple, on the armpit side, and slide outward about one thumb-width. Now let the fingertips settle and read the surface: ribs and grooves alternate under the skin, and you are feeling for the groove of the fourth space — the hollow lying between the fourth and fifth ribs. Once found, repeat the whole search on the other side, so both positions are confirmed rather than assumed.
Two confirmations help before any pressing begins. The first is counting: starting just below the collarbone, walk the fingertips down the breastbone line and tally the gaps — first, second, third, fourth. The fourth groove you meet is the level Tianchi belongs to, and checking that your beside-the-nipple hollow agrees with the counted groove catches most errors at once. The second is sensation: touch feather-light and compare sides. Many people notice a faint dull awareness or mild tenderness at the true point and very little a finger-width away, though bodies differ, and absence of sensation does not mean the location is wrong. Let a slow breath pass underneath; the groove shifts faintly as the ribs travel.
The classic mistakes are few and easy to avoid. One is drifting too far outward, chasing the point deep into the armpit — Tianchi stays on the chest proper, one thumb-width beyond the nipple, not half a hand toward the arm. Another is losing vertical track and settling a space too high or too low; the counting habit repairs this in seconds. A third is searching while hunched or tense, when the chest wall changes shape and the grooves hide. If the search goes wrong, simply return to the nipple, breathe out slowly, and measure one thumb-width afresh. The point does not move; only the search does.
Reading the Name: Heavenly Pool
Tian 天 means heaven or sky — the character pictures a great expanse above, and in point-names it regularly marks whatever stands highest on its channel or on the body. Chi 池 is a pool or reservoir: still water held in a basin, a place where what flows comes to rest and gathers. Read together, Tianchi is the heavenly pool, the celestial pond. Chinese point names favour such architecture — gates, valleys, courtyards, storehouses — and the metaphors do real work, compressing a point’s position and character into two characters that can be memorised at a glance. This name announces both altitude and collection: something high, and something gathered there.
Why a pool so high on the body? Traditional commentators connected the image with two facts the point keeps company with. First, Tianchi stands at the summit of its own channel — the pericardium pathway’s highest reach before it turns down the arm — and heaven is the natural name for a summit. Second, the point overlooks the breast region, and in the traditional physiology of nursing, milk was understood as fluid gathering and pooling in the breast; a point beside that territory took the pool into its name. Commentators also note the shallow hollows and soft slopes of this stretch of chest wall, which read like the rim of a basin. These are traditional readings offered as tradition rather than anatomy lessons — but they show how the tradition thought with landscape.
Pinyin renders the name Tiānchí: tian carries the first tone, a high, level, sustained voice, and chi carries the second tone, rising from middle pitch upward — the sound of asking or climbing. The hanzi pair 天池 is compact enough to memorise at a glance. Within the channel the point holds the opening office: nine points form the pericardium channel in classical numbering, and Tianchi is numbered first, the headwater above the long descent through elbow, forearm, palm, and finally the tip of the middle finger. Names that begin a channel’s story often carry its character, and this one — water gathered high, ready to flow down — suits the pathway that follows remarkably well.
Traditional Indications, Explained
The recorded indications read: breast abscess, insufficient lactation, cough, asthma, and hypochondriac pain. Framed as tradition rather than promise: a breast abscess — in classical writing, a hot, swollen, painful gathering in the breast — belonged to the disorders classical practice addressed at points around the breast and on the channels crossing it, and Tianchi sits directly in that territory. Insufficient lactation names a thin or failing milk flow in nursing mothers, understood traditionally as qi and blood not reaching the breast in abundance. Neither phrase carries a modern diagnosis; they are the traditional categories, recorded here so the point’s historic portfolio makes sense.
The remaining indications follow the map. Cough and asthma come naturally to a point on the chest wall: classical texts draw the pericardium channel arising in the centre of the chest, embracing its organ, before a branch reaches out to the side of the chest where Tianchi surfaces — so breath and chest complaints were read onto the whole route. Hypochondriac pain — in classical usage, ache of the flank, the strip of trunk between armpit and lowest ribs — belongs to the point’s other address, the chest side where front curves toward flank. A point standing at the crossroads of breast, breath, and flank accordingly collected all three in the old books; the geography explains the portfolio.
It bears repeating plainly: these are the traditional uses recorded in a licensed dataset and classical literature, offered for cultural and historical understanding. They are not claims that pressing this point treats any condition, and nothing here replaces assessment by a qualified clinician — least of all for breast complaints, where modern medicine has precise and urgent things to say. Where research touches self-applied pressure at all, reviews suggest effects are modest and context-dependent, and evidence specific to any single point remains thin. Hold the tradition lightly, and hold the safety rules firmly.
Self-Care Acupressure at Home
With the point located by the walkthrough above, settle in: seated, spine tall but unforced, shoulders heavy. Curl the index and middle fingers together and rest the pads — never the tips — on the spot. Begin with contact alone for a few slow breaths, then add small, unhurried circles, letting the skin glide over the tissue beneath rather than grinding against the ribs. Pressure should register as pleasant dullness or mild warmth, never sharpness. A common home rhythm is one to three minutes per side, once or twice daily, matched where possible to long exhales so each circle rides the breath out. Swap hands and give the other side the same measured attention, keeping the two sessions symmetrical.
Quality matters more than duration, and here more than at most points. The chest wall over this space is softer and more yielding than a bony wrist or forearm, so lighten the touch accordingly — the aim is contact the body welcomes, not pressure it braces against. Warm cold hands first, choose a quiet corner over a screen, and treat the practice as a breathing pause: inhale through the nose, feel the chest expand under still fingertips, press gently on the long exhale. People who keep a routine often anchor it to an existing habit — morning dressing, an evening wind-down — because consistency, not intensity, is what self-care traditions actually ask for. On tired, ill, or hurried days, skip entirely; the practice forgives absence, not force.
Treat the exercise as a small ceremony of attention rather than a treatment session. Across weeks, notice what changes: perhaps the area feels less guarded, perhaps breathing feels smoother while you press, perhaps nothing shifts except that you spend ninety seconds attending to your own chest. Every one of those outcomes fits the honest scope of self-acupressure. What does not fit is escalation — pressing harder, longer, or deeper to force a result, especially over soft tissue that shields delicate structures. When curiosity pulls that way, return to gentleness or simply stop for the day; the pool imagery earns its keep here — still water, not churned water.
Cautions and Safe Practice
This point earns the same respect its neighbours on the chest wall earn, and the reason is written in the licensed record. The dataset cautions practitioners not to needle Tianchi deeply, because deep insertion at this site can puncture the lung — an injury that can collapse it and become a medical emergency. The warning follows plain geography: soft tissue and thin membrane over the pleural cavity leave little margin for error at depth. Professional training manages that risk with exact technique; home self-care manages it differently and far more simply — by never leaving the surface at all.
For fingertip acupressure the practical rules follow from that picture. Keep pressure light and strictly superficial, staying in skin and superficial tissue, never driving inward between the ribs. Use finger pads — never elbows, knuckles, or tools — and never press while holding the breath or through pain. Skip the point entirely during any acute breathing difficulty, during a feverish illness, and over broken, irritated, or freshly scarred skin; be cautious after recent chest injury or surgery until a clinician clears ordinary activity. Sharp, electric, or radiating sensation means stop at once and do not try again that day. Pregnant readers, nursing mothers with sore or cracked skin, and anyone living with lung or heart conditions should consult a qualified practitioner before adding any new point practice.
And the wider rule stands over everything: this page is educational, and acupressure is self-care, not diagnosis or therapy. Seek prompt medical care — not a pressure routine — for any breast lump, spreading redness or heat in the breast, fever with breast pain, breathlessness, chest pain, a cough lasting beyond a few weeks, or any symptom that frightens you; a suspected breast infection in particular belongs with a doctor the same day. Persistent symptoms belong with a licensed practitioner, whether in conventional or East Asian medicine. The heavenly pool is a lovely image, but its safest gift to most people is a kinder acquaintance with their own chest wall.
Tianchi, the Heavenly Pool, opens the pericardium channel high on the outer chest, a thumb-width beside the nipple. Classical practice reached for it when breast complaints, cough, or aching along the ribs weighed on a person. This guide walks through finding it by touch and pressing it gently, with the care this chest-wall position deserves.
Cautions from the classical sources
- Keep insertion shallow, angling the needle obliquely or transversely away from the chest wall so it cannot puncture the lung.
Self-care limits
Frequently asked
- How do I find Tianchi without knowing anything about cun?
- Use the nipple as the whole map. Find it, slide one thumb-width toward the armpit along the same horizontal level, and let the fingertips settle into the groove beneath them; then confirm the level by counting four gaps down from the collarbone. Where the beside-the-nipple groove and the counted fourth groove agree lies the location the dataset describes. Cun measurements simply encode the same landmark sequence in proportional language.
- Is pressing Tianchi myself actually safe?
- Gentle fingertip pressure held on the surface is generally reasonable self-care for healthy adults, because it engages skin and superficial tissue far short of the structures behind the ribs. The recorded danger concerns deep professional techniques aimed toward the lung — a category home acupressure never approaches. Respect the stop signals: sharp pain, radiating sensation, or discomfort that worsens all mean finish immediately.
- What did classical practice use Tianchi for?
- The traditional record lists breast abscess, insufficient lactation, cough, asthma, and hypochondriac pain. Classical texts describe it as the pericardium channel’s opening point on the chest, which is why breast and breath complaints dominate its historic portfolio. Those are traditional frameworks for understanding the body, documented for context — not evidence-backed treatment claims.
- Why does the pericardium channel begin on the chest?
- Classical channel theory draws the pericardium pathway arising in the centre of the chest around its organ, the pericardium itself, before a branch reaches sideways to the lateral chest where Tianchi surfaces just below the armpit. From there the channel descends the inner arm — classically described as running between the lung and heart pathways — through the elbow and forearm into the palm, ending at the tip of the middle finger. Beginning on the chest gives the channel its pool-gathering name and its downward story.
- Can acupressure at Tianchi replace seeing a doctor about a breast problem?
- No. Self-acupressure is a comfort practice, not a diagnostic tool, and breast complaints carrying red flags — a new lump, skin changes, fever, spreading redness or worsening pain — need prompt professional assessment, sometimes urgently. Think of the two as different floors of the same building: daily self-care lives downstairs, and clinical medicine keeps the consulting room upstairs for when symptoms persist or escalate. Neither substitutes for the other.
Sources
- 01WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), World Health Organization — nomenclature conventions.
- 02A Manual of Acupuncture, Peter Deadman, Mazin Al-Khafaji and Kevin Baker — point-name tradition and channel context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for PC1 Tianchi — location, point class, actions, and caution record.
Last reviewed
牌記This leaf, for machines
Old books ended with a colophon saying who printed them. Every leaf here carries the same facts as structured data for agents and search, with no layout in the way.
- GET /en/points/pc1/leaf.json
- GET /zh-hant/points/pc1/leaf.json
- GET /zh-cn/points/pc1/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "PC1",
"name": {
"en": "Tianchi",
"gloss": "Heavenly Pool",
"zh-Hant": "天池",
"zh-Hans": "天池"
},
"channel": {
"id": "PC",
"order": 1,
"of": 9
},
"location": {
"text": "In the rib space level with the nipple, one thumb-width outside it."
},
"for": [
"cough",
"pain at the side of the ribs",
"low breast milk"
],
"press": {
"text": "A light fingertip touch on the surface, about a minute each side.",
"seconds": 60,
"sides": "both"
},
"cautions": [
"Light touch only; never press in between the ribs."
],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/pc1",
"lastReviewed": "2026-08-24"
}