商陽 Shangyang
“Shang Note, Yang Side” · LI1
Hand Yangming · 1 of 20 · jing-well
Where. On the index finger, just off the corner of the nail on the thumb side.
For. Toothache, sore throat, fever.
Press. Press with a fingernail edge, on and off, for about a minute.
商陽者，金也。一名絕陽，在手大指次指內側，去爪甲角如韭葉按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Shangyang Sits on the Index Finger
The dataset places Shangyang with unusual economy: on the index finger, on the radial side of the distal segment, 0.1 cun from the corner of the nail. Unpacked, that means the following. The distal segment is the last segment of the finger, the one wearing the fingernail. Radial means the thumb side, because the radius is the forearm bone on that side. And 0.1 cun — a cun being the proportional body-measure of Chinese point-location, roughly one full thumb-width at scale — shrinks here to almost nothing: a sliver. In practice the figure points at the corner of the nail itself rather than at a spot measured away from it.
What lies beneath is worth knowing before any touch. Fingertip skin is among the most richly innervated territory on the whole body — dense with nerve endings that report fine texture, temperature, and pressure — which is why every point located here feels louder under contact than points sitting on thicker padding. The tissues are thin: skin, then periosteum close by over the last phalanx, with the nail fold curving around the corner. Sensation at the true site tends toward bright, tinny, faintly electric awareness rather than the deep dull ache typical of muscle-belly points, so even light contact announces itself clearly.
Orientation matters because the neighbouring point sits close behind. Shangyang hugs the radial corner of the nail of the index finger; Erjian (LI2) waits in the depression just below the knuckle end of that same thumb-side border. Keeping the two apart is mostly a matter of remembering that the channel starts at the extreme tip and works backward — Shangyang first, everything else after. Follow the channel forward from this corner and it runs up the radial border of the index finger, across wrist and forearm, past the elbow and shoulder, to finish beside the nose — the itinerary by which a fingertip point came to matter for complaints of teeth and throat.
A Self-Palpation Walkthrough
Sit comfortably and rest the hand to be examined palm-down on a table, fingers relaxed and slightly curled, exactly as they fall. Look at the index finger. Its thumb-facing border is the radial side, and the corner of the nail on that side is the destination. Trace the nail edge around to the outermost corner nearest the thumb and find the little angle where the nail meets the curving wall of skin. Shangyang occupies that junction, close enough to the nail corner that a slip of one nail-width takes you off it. No instruments are needed; eyes and one fingertip suffice.
Confirm before pressing anything more firmly. With the pad of the opposite thumb or index finger, touch feather-light at the nail corner and compare against the same spot on the other hand: most people feel a pinpoint of tingling or faint buzzing at the true site and noticeably less half a millimetre away. Check the neighbours too — the middle of the fingerprint pad is too far back, the centre of the nail lies off the channel entirely, and the pinkie-facing corner belongs to no point at all. A small mirror helps if you are working with your dominant hand and find the angles awkward.
Common slips are few but consistent. The first is retreating from the corner onto the fleshy pad — comfortable ground, wrong point, drifting toward LI2 territory. The second is losing track of which side is radial once the hand rotates; anchoring on the thumb solves it, because radial always means thumbward. The third is searching on a cold hand, where vasoconstriction dulls local sensation and makes confirmation unreliable — warm the hands first and the corner announces itself more readily. When in doubt, return to the nail, find its outermost thumb-side corner again, and settle there slowly.
Reading the Name: The Shang Note and the Yang Side
Shang 商 is not an everyday word — it names the second note of the ancient Chinese pentatonic scale, the sequence gong, shang, jue, zhi, yu that structured courtly music. Five-phase teaching mapped these five notes onto the five phases, and the shang note was assigned to metal, the phase governing lungs and large intestine. Yang 陽 means the sunny, outward-facing aspect. Read together, Shangyang points at a yang-side place belonging to the metal note — correspondence-thinking compressed into two syllables, naming both where the point stands and which phase it serves.
The metal theme deepens in the classical system of the five transport points. Old texts liken the channel qi flowing from extremity toward elbow or knee to a watercourse — bubbling up at a well, widening into a spring, then a stream, then a river, finally gathering at a sea. The wells, the jing-well points, sit at the tips of fingers and toes, and five-phase doctrine assigns each a single element; for yang channels the wells correspond to metal. Shangyang therefore carries metal twice over — well of a channel that already belongs to the metal phase — a doubling classical commentators found eloquent, reading it as the purest expression of the channel elemental nature.
Pinyin renders the name Shāngyáng, with a flat first tone on shang and a rising second tone on yang. The hanzi pair 商陽 repays a closer look: the older graph for shang carries senses of weighing and trade, though in this name tradition reaches for the musical note instead. Like gates, valleys, courtyards, and storehouses elsewhere along the channels, the name does argumentative work: it marks a threshold where the channel emerges into daylight, and it flags the metal identity binding the large intestine channel to its partner, the lung. Names in this system are rarely decoration.
Traditional Indications, Explained
The recorded indications read: toothache, sore swollen throat, febrile disease, loss of consciousness, and deafness. Framed as tradition rather than promise, they sketch a coherent portrait of how classical practice thought about this point. Dental complaints head the list because of geography: the channel texts describe the large intestine pathway crossing the cheek and entering the gums of the lower jaw, so aches of teeth and jaw were traditionally reached along the route, and the channel opening at the fingertip made Shangyang a standard early mention in such discussions. Classical discussion treated lower-jaw dental pain as especially native to this channel, leaving upper-jaw complaints to its yangming counterpart, the stomach channel.
Sore swollen throat and febrile disease belong together in the classical logic of heat. Yangming channels were described as abundant in qi and blood, and illnesses of sudden heat — feverish states, inflamed painful throat — were read as excess gathering strength along those abundant routes. Jing-well points stood at the outermost ends of the channels, and classical teaching gave them a special office in responding to acute presentations of heat. Loss of consciousness appears in the same record: old emergency traditions reached for the wells to rouse the collapsed, always as a practitioner-level intervention carried out by trained hands. Today a person who is unresponsive needs emergency services immediately — that part of the record belongs to history, not home care.
Deafness rounds out the list and looks least obvious, since no branch of this channel enters the ear directly; classical network thinking — paired channels, connecting branches, the webbed relationships of the face — allowed ear complaints to be addressed from distant stations. Two honest caveats frame the whole list. These are traditional uses recorded in a licensed dataset and classical literature, offered for cultural and historical understanding, not claims that pressing this point treats disease. And where modern research touches self-applied pressure at all, reviews suggest effects are modest and heavily context-dependent, with evidence specific to any single point remaining thin.
Self-Care Acupressure at Home
With the corner located by the walkthrough above, set up simply: seated, hands warm, examined hand resting palm-down. Bring the pad of the opposite thumb or index finger onto the nail-corner spot. Begin with bare contact for a few breaths, then add steady, gentle pressure — enough to feel the bright fingertip tingle, never enough to blanch the skin white or make you wince. Small slow circles work nicely, the contact staying fixed while the pressure breathes in and out. A common home rhythm is one to three minutes per side, once or twice daily, with slow exhales pacing the pressure. Swap sides and keep the sessions symmetrical.
Force has even less place here than at most points. Fingertip tissue is thin and busy with endings, so heavy jabbing buys nothing but soreness and a bruised nail bed. Warm your hands first if they run cold. Keep the nails of the pressing hand short and clean, since the target sits right beside your own nail edge. Choose a quiet moment rather than a screen-bound one; many people pair the minute of pressing with a slow-breathing pause, which suits the wellness register better than any attempt at intensity. Consistency, not strength, is what self-care traditions actually ask for.
Treat the practice as a small ceremony of attention. Across days and weeks notice what changes: perhaps growing familiarity with your own hands, perhaps a pleasantly grounded minute in an afternoon, perhaps nothing measurable at all — every one of those outcomes fits the honest scope of self-acupressure. What does not fit is escalation: pressing harder, longer, or sharper to force a result, or reaching for anything that breaks the skin. When curiosity pulls that way, return to lightness or stop for the day. The point will be there tomorrow, exactly where the corner of the nail meets the world.
Cautions and Safe Practice
The licensed dataset records no cautions for Shangyang, and that plain fact deserves careful handling: an empty caution field reflects what the compilers wrote down, not a licence for force at this site. Fingertips heal readily but carry real sensitivities — the nail-fold corner is a place where broken skin turns infected easily, and the dense nerve supply that makes the point easy to feel also makes careless pressure disproportionately unpleasant. Conservative practice costs nothing and loses nothing: everything this page teaches happens on the surface, with pads, patience, and light pressure.
Draw the boundaries wide. Surface pressure only — nothing sharp ever touches this point, and any technique that pricks or breaks the skin belongs nowhere near home practice; certain old records describe professional emergency techniques of releasing a drop of blood at jing-well points, and those accounts are history for licensed hands, not instructions for kitchens and desks. Skip the point entirely over hangnails, paronychia, warts, cuts, or any broken or irritated skin around the nail. Be cautious, and consult a clinician beforehand, with diabetes, poor peripheral circulation, peripheral neuropathy, or any clotting condition or blood-thinning medication, all of which change how fingertip tissue tolerates even minor trauma. Children have smaller fingers and thinner patience alike — gentler still, ideally with professional guidance first.
And the standing rule rises over everything: this page is educational, acupressure is self-care, and neither diagnoses nor treats anything. Seek prompt medical care — never a pressure routine — for severe throat swelling or trouble swallowing or breathing, high or persistent fever, marked facial swelling suggestive of dental infection, chest pain, signs of stroke, or anyone found unresponsive, which means calling emergency services immediately. A toothache with facial swelling or fever belongs at a dentist or urgent clinic now, not tonight. Persistent symptoms belong with a licensed practitioner, medical or East Asian medical as suits the complaint. The safest thing Shangyang offers most people is a finer acquaintance with their own hands.
Shangyang, the Shang Yang, opens the large intestine channel at the outermost corner of the index fingernail. Classical practice treated this tiny jing-well point as a first reach for toothache, sore swollen throat, and sudden heat illness. This guide walks you to the spot by touch, shows how to press it gently at home, and draws the line where self-care stops and professional care begins.
Self-care limits
Frequently asked
- How do I find Shangyang without knowing anything about cun?
- Ignore the measurement and use the nail. Rest the hand palm-down, look at the index finger, and find the corner of the nail on the thumb-facing side. The point sits right at that corner, where the nail edge meets the curved wall of skin — close enough that an error of one nail-width takes you off it. The 0.1-cun figure in the dataset encodes the same instruction in proportional language: essentially nothing measured away from the nail corner itself.
- Is pressing LI1 myself actually safe?
- Gentle surface pressure with a finger pad is reasonable self-care for healthy adults: the tissues involved are skin and the immediate structures of the fingertip, and patient, moderate contact does them no harm. The genuine risks at this site come from force and from anything that breaks the skin — bruised nail beds, infected nail folds — all of which conservative practice avoids entirely. Respect the stop signals: sharp pain, intense electric sensation, or spreading discomfort mean finish immediately.
- What did classical practice use Shangyang for?
- The traditional record lists toothache, sore swollen throat, febrile disease, loss of consciousness, and deafness. The channel course through cheek and gums anchors the dental uses; the classical association of jing-well points with acute heat presentations anchors the throat and fever entries; and the revival traditions behind the loss-of-consciousness entry were strictly practitioner-level emergencies. Those are frameworks for reading the classical literature — documented for context, not evidence-backed treatment claims.
- Why do so many channels begin at the fingertips?
- Classical physiology pictures channel qi as a watercourse emerging at the extremities and gathering strength as it travels inward — well, spring, stream, river, sea. Fingertips and toe-tips are where the current first surfaces, which is why the ten jing-well points all live there and why classical texts gave these tiny points outsized roles in acute presentations. Beginning at the tips also lets one channel serve the whole limb from a single starting gate, the way a river stays legible from its source onward.
- Can pressing Shangyang replace seeing a dentist about my toothache or a doctor about my sore throat?
- No. Self-acupressure may offer a comfortable pause, but dental decay, abscess, strep throat, and febrile illness are clinical problems with clinical answers, and delay makes several of them worse. Treat facial swelling, fever, difficulty swallowing, or worsening pain as reasons to arrange care promptly, and keep the fingertip minute in its honest place — a small daily practice of attention, downstairs from medicine, never a substitute for it.
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 etymology, jing-well theory, and channel context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for LI1 Shangyang — location, point class, actions, and indication 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/li1/leaf.json
- GET /zh-hant/points/li1/leaf.json
- GET /zh-cn/points/li1/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "LI1",
"name": {
"en": "Shangyang",
"gloss": "Shang Note, Yang Side",
"zh-Hant": "商陽",
"zh-Hans": "商阳"
},
"channel": {
"id": "LI",
"order": 1,
"of": 20
},
"location": {
"text": "On the index finger, just off the corner of the nail on the thumb side."
},
"for": [
"toothache",
"sore throat",
"fever"
],
"press": {
"text": "Press with a fingernail edge, on and off, for about a minute.",
"seconds": 60
},
"cautions": [],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/li1",
"lastReviewed": "2026-08-24"
}