In pregnancy, ask a practitioner first.
照海 Zhaohai
“Shining Sea” · KI6
Foot Shaoyin · 6 of 27 · eight-confluent point (opens the yin qiao vessel)
Where. In the hollow straight below the tip of the inner ankle bone.
For. Poor sleep; a dry, sore throat; painful periods.
Press. Gentle finger pressure, about a minute each side.
Caution. In pregnancy, ask a practitioner first.
照海，陰蹺脈所生，在足內踝下一寸按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Zhaohai Sits on the Inner Ankle
On the inner side of the foot, directly below the tip of the medial malleolus — the small bony knob at the lower end of the shinbone — the dataset locates Zhaohai in a soft depression. Trace the story with a fingertip on your own ankle: the bone rises into that familiar prominence, tapers to a rounded point, and just beneath the point the contour falls away into a shallow, yielding hollow. That hollow is the whole address recorded for this point. No proportional measuring enters the description; the landmark alone carries the location, which makes Zhaohai unusually friendly territory for self-palpation.
What the fingertip meets there is worth knowing before any pressure begins. The hollow sits over the tarsal bones of the midfoot, cushioned by skin, a thin layer of soft tissue, and the fan of tendons crossing from leg to foot. A short step backward — behind the malleolus rather than below it — lies the neighbouring point Taixi (KI3), seated in the depression between the malleolar tip and the Achilles tendon, where many people can feel their own pulse ticking under the skin. The contrast aids orientation: Zhaohai keeps company with the underside of the ankle bone, while its celebrated neighbour occupies the corridor behind. Both belong to the same channel and walk the same inner border of the foot.
Zhaohai is the sixth of the kidney channel’s twenty-seven points, early in that channel’s long climb. Classical teaching draws the kidney pathway rising from the sole of the foot, up along the inner leg, all the way to the chest — so this ankle-level hollow stands near the bottom of an ascent spanning the body. Comparing left and right ankles confirms how faithfully nature repeats the landmark: the same knob, the same tapering tip, the same pocket of softness below it on each side. Once learned on one foot, the location transfers to the other without translation.
A Self-Palpation Walkthrough
Set yourself up comfortably: sit on a firm chair, rest one ankle across the opposite knee, and let the foot hang loose so the tendons soften. Place your thumb on the inner edge of the ankle bone and slide slowly down its curve until you reach its lowest point — the tip of the medial malleolus. From there, drop straight down: within a finger’s breadth the thumb should settle into a shallow hollow where the contour gives way beneath it. Softness rather than bony edge is the sign that the search has ended well. Swap hands afterwards so both ankles receive equal, unhurried attention.
A few quiet confirmations help before pressing begins. Touch feather-light and compare sides: many people notice a faint, dull awareness at the true spot and little sensation a finger-width away. Flex the ankle gently while the thumb stays in place — the hollow persists through the movement because it lies below the joint line rather than across it. Check the neighbourhood too: sliding back toward the Achilles tendon brings you into the deeper corridor behind the ankle, where Taixi sits and a pulse may be felt. If instead your thumb rests on bare bone or drifts toward the toes, return to the tip and measure straight down once more.
Two mistakes account for most misses. The first is stopping on the side of the knob itself, half a finger too high, where bone still fills the space under the thumb; the remedy is simply continuing down past the tip until the ground opens. The second is wandering backward into the tendon corridor behind the malleolus — comfortable ground, but that is Taixi’s address, not Zhaohai’s. The relationship between the two points repays deliberate learning: the tip of the bone belongs to one, the hollow behind the bone to the other, and both are found from the same starting landmark. When in doubt, begin again at the lowest point of the ankle bone and move slowly.
Reading the Name: Shining Sea
The characters sketch the image plainly. Zhao 照 means to shine, to illuminate, to cast light upon — the character even carries fire at its base, light given off downward and outward. Hai 海 means sea, the vast gathered water. Read together, Zhaohai is the shining sea: a place where the tradition pictures a great reservoir of water with light playing across its surface. Point names rarely merely decorate; they teach. Here the teaching says that this modest hollow beside the ankle bone was understood as a threshold onto something deep and abundant — the kidney system’s stored water regarded as a sea rather than a trickle.
The imagery fits the traditional frame around the kidney itself. Among the five phases the kidney belongs to water; classical teaching credits it with storing the essence — the deep reserve a person draws on across a lifetime — and with overseeing the body’s waterways. In that frame, a sea is exactly what kidney-water should be: broad, deep, calm, able to send moisture upward when needed. Traditional interpretation links this upward-moistening role to several recorded uses at this point — the dry throat eased when the sea sends mist, the eyes brightened when deep water feeds them. These are interpretive readings of the name, offered for understanding rather than asserted as effects.
Pinyin renders the name Zhàohǎi: zhao carries a falling fourth tone, hai a dipping third tone that falls and rises again. The hanzi pair 照海 is easy to hold in memory. There is also a wider pleasure here: the lower kidney channel reads like a watershed written in point names — Yongquan, the gushing spring, at the sole; Rangu, the valley, just beyond; Taixi, the great stream, at the ankle; Shuiquan, the water spring, below it; and then Zhaohai, the sea itself. Walking the points in order follows water gathering downhill, pooling ever deeper — until, under the inner ankle, the sea arrives.
Traditional Indications, Explained
The recorded indications open with three striking entries: epilepsy, insomnia, and dry and sore throat. Framed as tradition rather than promise: old records reached for Zhaohai in sleeplessness — the classic picture being a person lying wakeful with a restless mind and a dry mouth — and in throats felt as parched, scratchy, or sore, particularly in patterns understood as dryness rather than simple heat. Epilepsy stands differently. Seizure disorders appear throughout the classical literature as conditions practitioners engaged, but today a seizure, a first seizure, or any change in an established seizure condition belongs squarely with medical care. The record preserves history; modern safety redraws the boundary.
Next come swollen and painful eyes and teeth, followed by a telling pair: difficult urination and frequent urination. Listing both together looks contradictory until the traditional logic shows through. The kidney governs water, so classical practice approached troubled water metabolism — flow that stalls, flow that never settles — at the channel’s water-named points, Zhaohai among them. Eye complaints entered the same reasoning by another route: classical teaching associates the vessel this point opens with the eyes, so red, aching, tired eyes were read as the upper reaches of a water problem. Toothache joined the list through deficiency-fire imagery — the notion that when the sea runs shallow, false warmth flares upward.
The remaining indications gather women’s health and local support: irregular menstruation, dysmenorrhea, vaginal discharge, and weakness of the lower limb. The gynaecological cluster follows from the kidney’s traditional office as storehouse of essence, long tied in classical physiology to cycles and fertility; the limb weakness follows from plain geography, since the channel passes this ankle on its climb. One honesty note belongs beside all of these: they are the traditional uses recorded in a licensed dataset and classical literature, presented for cultural and historical understanding. Where modern research touches self-applied pressure at all, reviews suggest effects are modest and context-dependent, and evidence specific to any single point remains thin.
Self-Care Acupressure at Home
With the point found by the walkthrough above, settle in: seated, foot crossed over the opposite knee, hands warmed first. Rest the pad of your thumb — never the tip or knuckle — on the hollow. Begin with contact alone for a few slow breaths, then add small, patient circles, letting the skin glide over the tissue beneath rather than grinding against the bone. 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 to slow exhales so each circle rides the breath out. Swap sides and keep the sessions symmetrical.
Timing can borrow from the point’s own tradition. Because classical practice reached for Zhaohai in sleepless hours, an evening slot suits the imagery: lights lowered, screens put away, one ankle across the knee, a few unhurried minutes before bed. Nothing about the practice asks for intensity — quality matters far more than force, and consistency more than either. Anchoring the minutes to an existing habit, such as evening washing or a bedtime stretch, keeps the routine alive; chilled hands should be warmed first, since cold muscle guards itself. Treat the whole thing as a wind-down that happens to include a point, not a procedure aimed at manufacturing sleep.
Hold honest expectations throughout. Self-acupressure is a comfort practice and a small ceremony of attention: perhaps the area softens, perhaps breathing slows while you press, perhaps nothing changes except that you spent two minutes caring for your own feet — and every one of those outcomes fits the practice’s true scope. What does not fit is escalation: pressing harder or longer to force a result. The ankle’s thin padding turns excess enthusiasm directly into soreness. When curiosity leans toward force, return to gentleness, or stop for the day and let the habit, not the pressure, do the accumulating work.
Cautions and Safe Practice
The licensed dataset records no specific cautions for Zhaohai — unlike certain chest and neck points whose entries carry explicit warnings, this one arrives with none attached. Say plainly what that means: absence of a recorded warning is not an invitation to force. The local geography argues for gentleness regardless — skin, a little soft tissue, and then bone lie close together here, so heavy pressure buys soreness without reaching anything useful. The universal rules of home acupressure therefore stand at full strength: surface contact only, patience over power, and steady attention to whatever the tissue reports back.
For daily practice the rules fit in a breath: use finger pads, never tools, elbows, or devices; keep contact superficial and comfortable; skip the point entirely over broken or irritated skin, during feverish illness, or whenever the ankle is swollen or recently injured; and stop at once on sharp, electric, or radiating sensation, giving the area the rest of the day off. Pregnant readers, and anyone living with conditions affecting the feet or their sensation — circulation problems among them — should consult a qualified practitioner before adding any new point practice. None of these are special warnings about Zhaohai; they are the ordinary hygiene of sensible self-care.
And the wider rule stands above everything: this page is educational, and acupressure is self-care, not diagnosis or therapy. Seek prompt medical care — not a pressure routine — for seizures or any change in a seizure condition; for severe sore throat with difficulty swallowing or breathing; for blood in the urine, inability to pass urine, or urinary symptoms accompanied by fever; and for insomnia that persists long enough to erode the days. Persistent symptoms belong with a licensed practitioner, medical or East Asian medical as suits the complaint. The shining-sea image is lovely, but the safest gift Zhaohai offers most people is a kinder acquaintance with their own ankles.
Zhaohai, the Shining Sea, rests in a shallow hollow just below the tip of the inner ankle bone. Tradition treats it as a gateway where the kidney channel meets one of the extraordinary vessels, and old records reach for it in sleepless nights, dry throats, and tired, strained eyes. This guide shows how to find it by touch and press it gently at home.
Self-care limits
Frequently asked
- How do I find Zhaohai without knowing anything about cun?
- You barely need cun at all — the dataset describes this point purely by landmark. Find the bony knob on the inside of your ankle, slide to its lowest tip, then come straight down into the shallow hollow beneath. Softness under the thumb confirms the spot. Cun measurements matter elsewhere on the channel; here the ankle bone does all the measuring.
- Is pressing Zhaohai myself actually safe?
- Gentle fingertip pressure held on the surface is generally reasonable self-care for healthy adults, and the licensed record carries no caution specific to this point. The tissue involved is skin and superficial layer over bone, far from anything delicate. Respect the stop signals — sharp pain, radiating sensation, worsening discomfort — and skip the area if the skin is broken or the ankle injured.
- What did classical practice use Zhaohai for?
- The traditional record lists epilepsy, insomnia, dry and sore throat, swollen and painful eyes and teeth, difficult and frequent urination, irregular menstruation, period pain, vaginal discharge, and weakness of the lower limb. Classical texts describe it as a gateway opening onto one of the eight extraordinary vessels. Those are traditional frameworks documented for context — not evidence-backed treatment claims.
- What does "opens the yin qiao vessel" mean?
- Classical theory recognises eight extraordinary vessels — deep reservoir channels beyond the twelve regular meridians — and assigns each of eight special points a doorway role onto one of them. Zhaohai’s assigned vessel is the yin qiao. Classical teaching traditionally paired Zhaohai with Lieque (LU7) at the wrist in this framework, and associated the yin qiao with the eyes and with the rhythm of sleeping and waking — which is why sleepless-night imagery gathers around this point.
- Can pressing Zhaohai replace treatment for my insomnia or sore throat?
- No. Self-acupressure is a comfort practice, not a diagnostic or therapeutic tool. A persistent sore throat — especially with fever or trouble swallowing — needs professional assessment promptly, and insomnia that erodes daytime life deserves the same. Think of evening self-care and clinical medicine as different rooms in one house: nightly habits live in one, proper evaluation waits in the other, and you visit the second room whenever symptoms persist or frighten you.
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, eight-confluent theory, and channel context.
- 03aijiu-mpvue (MIT License) licensed dataset, entry for KI6 Zhaohai — 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/ki6/leaf.json
- GET /zh-hant/points/ki6/leaf.json
- GET /zh-cn/points/ki6/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "KI6",
"name": {
"en": "Zhaohai",
"gloss": "Shining Sea",
"zh-Hant": "照海",
"zh-Hans": "照海"
},
"channel": {
"id": "KI",
"order": 6,
"of": 27
},
"location": {
"text": "In the hollow straight below the tip of the inner ankle bone."
},
"for": [
"poor sleep",
"a dry",
"sore throat",
"painful periods"
],
"press": {
"text": "Gentle finger pressure, about a minute each side.",
"seconds": 60,
"sides": "both"
},
"cautions": [
"In pregnancy, ask a practitioner first."
],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/ki6",
"lastReviewed": "2026-08-24"
}