Finding LI4 in Three Seconds: Using a Chinese Acupoint Locator the Way a TCM Student Actually Looks Things Up

The first thing I learned in my third week of an acupuncture elective was that nobody — not the instructor, not the senior students, not the licensed practitioners I shadowed — looks up an acupoint the way the textbook indexes are organized. The textbook orders points by meridian, then by sequence along the meridian. Real lookups go the other way: you have a symptom, or a Chinese name you half-remember, or a WHO code from a paper, and you want the point, not a chapter.

That mismatch is the entire reason the Chinese Acupoint Locator exists. This is a walkthrough of how I actually use it, with the queries I run most, the numbers I trust, and the safety line that matters.

The 80/20 of Acupoint Lookup

The WHO Western Pacific Region's Standard Acupuncture Point Locations (2008) catalogues 361 channel points across the fourteen meridians plus 48 extra points (经外奇穴) — 409 total. That is the canon. It is also more than anyone actually uses week to week. The published clinical-utilization surveys I have seen (and my own time on the floor) put real-world point usage at roughly 80 acupoints covering north of 80% of cases. The long tail is real, but it is a tail.

The locator caps at 80+ on purpose. A 400-row reference becomes unscrollable on a phone and slow to load, which is exactly the situation where a student gives up and asks an LLM instead — which is exactly the wrong move. (More on why below.)

What you get in each entry:

WHO code (LI4, ST36, GV20…)
Chinese name + romanization (合谷 / Hégǔ)
Meridian (手阳明大肠经)
Anatomical location in classical 同身寸 phrasing
3–5 primary indications drawn from the classics
Classical needling depth, with contraindications flagged

That is the same shape of data the Standard Acupuncture Point Locations document uses. Nothing has been "modernized" or paraphrased into wellness copy.

How to Find Points by Symptom

Here is the lookup I run most often. The "Find by symptom" tab takes either Chinese or English. Type headache and the list narrows to the five-point combination every Chinese acupuncture textbook teaches in the headache chapter:

Query: headache

合谷  LI4    手阳明大肠经  手背第 2 掌骨桡侧中点
风池  GB20   足少阳胆经    枕骨下,胸锁乳突肌与斜方肌之间凹陷
百会  GV20   督脉          头顶,前发际正中直上 5 寸
太阳  EX-HN5 经外奇穴      眉梢与外眼角连线中点向后约 1 寸凹陷
印堂  EX-HN3 经外奇穴      两眉头连线中点

Those five together are what 《针灸大成》 (Yang Jizhou, 1601) lists for the headache pattern, and what every modern textbook I've opened — 《针灸学》 (Sun Guojie ed.), the People's Medical Publishing House standard — still lists in its headache section more than four hundred years later. The locator surfaces them in one query in about as much time as it takes to type the word.

The pattern repeats for back pain. Type back pain (or 腰痛) and you get 委中 BL40 and 肾俞 BL23 at the top — which maps directly to the classical mnemonic 「腰背委中求」 ("for back issues, seek Weizhong"). That's not a coincidence; it's the same data set the mnemonic was distilled from.

If you are tracking related wellness practice over time, the Yoga Pose Library is a useful complement — the cat-cow → child-pose flow targets the same lower-back zone the BL40/BL23 pair addresses from the acupressure side. For sleep complaints, where the canonical points are 神门 (HT7), 三阴交 (SP6), and 安眠 (extra point), I cross-reference with the Sleep Cycle Calculator for the actual bedtime math before reaching for the acupressure side.

What 脐下 3 寸 Actually Means

This is the part nearly every Western source gets wrong: 寸 (cun) is not the modern English inch. A 同身寸 ("body-inch") is proportional to the body of the person being measured. WHO 2008 codifies the conversion that practitioners have used since at least the Ming dynasty:

1 cun = the width of the patient's own thumb at the interphalangeal joint
3 cun = the combined width of the patient's four fingers, held together, measured at the proximal interphalangeal joint of the middle finger

So when the locator says 关元 (CV4): 脐下 3 寸, it means three of your thumbwidths below your navel — not three modern inches. The proportionality is the whole point. A 6'4" patient and a 5'1" patient have differently sized meridian maps in absolute centimeters, but both maps are correct in cun because cun is defined against the body it sits on.

I think a worked example helps. My own thumb at the IP joint is 22 mm wide. 脐下 3 寸 on me lands roughly 66 mm below the navel midline. Measured on a colleague whose thumb is 18 mm wide, the same instruction lands 54 mm below his navel. Both are at 关元. A static "3 inches" rule would put one of us in the wrong place by more than a centimeter — enough to matter.

Safety: Acupressure Yes, Self-Needling No

The locator includes a classical needling depth field, and that field exists for the same reason a botany guide lists a plant's height: it is part of the point's definition. It is not an instruction.

The line is genuinely simple:

Acupressure (firm finger pressure over the point, no skin penetration) is safe self-care. Use this reference for it.
Needling must be done by a licensed practitioner who has completed training in anatomy, sterilization, and depth control. Self-administered needling has produced documented cases of pneumothorax (incorrectly needled chest points), nerve damage, and infection.

The locator flags traditional contraindications too — 合谷 (LI4), 三阴交 (SP6), 昆仑 (BL60), 关元 (CV4) are all marked 孕妇禁针 (needling contraindicated in pregnancy) because the classics record them as strongly moving qi and blood. 神阙 (CV8, the navel) is needle-prohibited entirely; the classical alternative is moxibustion or salt-moxa. Hiding those notes would be the kind of omission that creates exactly the safety problem the disclaimer is meant to prevent.

On the evidence side, it is worth being precise. The Vickers et al. individual-patient-data meta-analysis (Journal of Pain, 2018 update) pooled 39 trials and 20,827 patients with chronic pain, and found acupuncture produced pain reductions of roughly 0.5 standard deviations versus sham and 0.8 SD versus no-acupuncture controls. That is a moderate, real, replicated effect — not a panacea, not nothing. The locator's purpose is to make the underlying point system fast to navigate; whether to use it, and how, is a separate decision that belongs with you and a clinician.

Where the Data Comes From — and Why LLM TCM is the Wrong Answer

Every point name, code, location, indication, and needling depth in the locator traces back to public-domain canon: 《针灸甲乙经》 (Huangfu Mi, Western Jin — the first systematic acupuncture text), 《十四经发挥》 (Hua Shou, Yuan — the fourteen-meridian organization still used today), and 《针灸大成》 (Yang Jizhou, Ming — the most-cited location and indication source). Romanized codes follow WHO 2008.

What we explicitly did not do: ask an LLM to "generate the standard acupoints." LLM-generated TCM data has a specific and dangerous failure mode — plausible-sounding invented points, fluent-sounding but textually unsupported indications, and confidently wrong cun measurements. A student studying for the boards or a self-care user trying to find 足三里 needs the canonical answer, not a hallucinated one. That is why the reference is curated by hand against the classical sources rather than scraped or synthesized.

If you are using the locator alongside other Chinese-language references, the Lunar Calendar Converter handles the date math that comes up when reading older clinical case records (which date by lunar/solar terms), and the Bazi Calculator covers the related but separate territory of Chinese chronological systems. Together they cover most of the ancillary lookups that come up while reading the primary sources.

The locator is one tool — small, focused, hand-curated. The right use is the one a TCM student described to me in one sentence: "I want to type a symptom and see the points, in three seconds, on my phone, on the subway." That is the brief. That is what it does.

Made by Toolora · Updated 2026-05-27