HT-03 (Shao Hai) Lesser Sea

What does HT-03 Shao Hai do?

Shao Hai HT-03 is the He-Sea and Water point of the Heart channel of Hand Shao Yin, and its recorded work is to calm the spirit, transform phlegm and clear heat — and, locally, to open the channel and benefit the arm. Sacred Lotus sources & references record that classification and those actions directly. Two things follow from the classification. He-Sea points are the last and deepest of the five-shu set, where the channel's qi is said to enter inward like a river reaching the sea, and they are classically indicated for disorders of their organ. And because the Heart is a yin Fire channel, its Water point is the element that controls Fire — which is the technical basis on which a point at the elbow is used to cool an overheated Heart.

• Calms the spirit — the first recorded action. The Heart houses the spirit in classical theory, and HT-03 is the channel's elbow point for agitation, anxiety, fright and disturbed mind. It is one of the several Heart-channel points that carry this action, and the one furthest from the hand.
• Transforms phlegm and clears heat — the combined action behind its most distinctive classical indication, scrofula: the chains of hard nodules in the neck and armpit that the tradition attributes to phlegm-fire congealing in the channels. Very few Heart-channel points carry a nodule indication, and this is the one that does.
• Cools the Heart through the controlling element — the five-element reading of the same action. Water controls Fire; the Water point of a Fire channel is where the tradition reaches when the Heart's fire needs to be met by its controller rather than drained through its child. That is a different mechanism from HT-08's direct fire-clearing and from HT-07's child-point drainage, and it is what distinguishes this point from both.
• Activates the channel and benefits the arm — the local action, and in modern practice the busiest one. HT-03 sits at the elbow, and it is used for pain, spasm, numbness and tremor of the hand and arm, and for pain along the inner arm where the Heart channel runs.
• Relieves pain in the armpit and the flanks — the recorded action for pain in the axilla and hypochondrium, which follows the Heart channel's path from the armpit down the arm.

Source: Sacred Lotus sources & references (existing action record; Heart channel and He-Sea & Water classification queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 214); Chinese Acupuncture & Moxibustion (pp. 164–165); Nan Jing, on the five-shu indications and the mother-child rule; cross-referenced against multiple online sources.

What is HT-03 Shao Hai used for?

Shao Hai HT-03 is used for pain in the cardiac region, for spasm, numbness and tremor of the hand and arm, for scrofula — hard nodules in the neck — and for pain in the armpit and the flanks. 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. This is a low-hazard point; the reference facts are set out under needling.

• Pain in the cardiac region
• Palpitations
• Spasmodic pain of the hand and arm
• Numbness of the hand and arm
• Tremor of the hand
• Pain along the inner side of the arm and elbow
• Inability to raise the arm to the head
• Scrofula — chains of hard nodules in the neck and armpit
• Pain in the axilla
• Pain in the hypochondriac region (the flanks below the ribs)
• Headache and dizziness
• Toothache
• Anxiety, agitation and disturbed spirit
• Mania and forgetfulness

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 214); Chinese Acupuncture & Moxibustion (pp. 164–165).

Where is HT-03 Shao Hai, and how is it used in practice?

Shao Hai lies at the inner end of the elbow crease. With the elbow bent, it is found midway between the inner end of the crease and the bony knob on the inner side of the elbow — the medial epicondyle of the humerus. Sacred Lotus sources & references give it that way, and also as the midpoint between Qu Ze P-03 and the medial epicondyle when the elbow is fully flexed. Both descriptions place it in front of the bony knob, on the crease, not behind it — a distinction that matters both for finding the point and for understanding what lies under it.

In practice HT-03 is the Heart channel's local point for the elbow and arm, and its everyday use is musculoskeletal: pain, spasm, numbness and tremor of the hand and forearm, and pain along the inner arm. Its classical use is broader and reaches the Heart itself, and it retains one indication that almost no other Heart-channel point carries — scrofula, the hard nodules of the neck and armpit. It is a comfortable, accessible point with bone close behind it, and it is commonly treated with moxibustion as well as needling.

Which points is HT-03 combined with?

• With Shen Men HT-07 — the Heart channel's Source point at the wrist, and its default point. Elbow with wrist on the same channel is the standard structure for arm complaints, and the pairing brings HT-07's spirit-calming to bear alongside HT-03's local action.
• For hand tremor — a combination the classical record singles out. Data-mining of the earliest ancient prescriptions for chest obstruction and heart pain produced a striking point-specific finding: Shao Hai HT-03 was invariably selected when the presentation was accompanied by tremor of the hand (Zhongguo Zhen Jiu 2025;45(10):1505–1511, PMID 41074530). That matches our own indication record, which carries "tremor of the hand" for this point, and it is an unusually direct confirmation of a traditional indication from the classical corpus itself.
• With Nei Guan P-06 and Qu Ze P-03 — the Pericardium channel's points at the wrist and in the elbow crease, immediately alongside. The same classical analysis found that the Pericardium channel dominates the ancient repertoire for cardiac pain under the principle of "the Pericardium acting on behalf of the Heart" (PMID 41074530), and P-03 sits close enough to HT-03 that our own location record defines HT-03 partly in relation to it.
• With Qu Chi LI-11 — the He-Sea point at the outer end of the same elbow crease. Needling the medial and lateral He-Sea points of the elbow together is a common local treatment for elbow and arm pain, and the pair is easy to remember because both are He-Sea points at the same joint on opposite sides.
• With Xin Shu BL-15 and Ju Que REN-14 — the Heart's Back-Shu and Front-Mu points, both written up in this library, added wherever the treatment is aimed at the Heart as an organ rather than at the arm.
• For scrofula and neck nodules — with Tian Jing SJ-10 above the elbow on the other side of the arm, the tradition's principal distal point for dissolving nodules, and with Feng Chi GB-20 and Zhou Rong-region local points. SJ-10 and HT-03 are the two elbow-region He-Sea points that carry a nodule indication, and our SJ-10 record carries the same use from its own side.
• With Jian Shi P-05 and Feng Long ST-40 — for phlegm patterns affecting the mind, adding the tradition's principal phlegm point at the leg.

Where does HT-03 sit among the five-shu points?

The five-shu points are the set of five on each channel between the fingertips or toes and the elbow or knee, described in the Ling Shu as the stages of a river: the qi wells up, glides, pours, flows and finally enters inward. Sacred Lotus sources & references hold the complete Heart set, and it is worth seeing whole because the element assignments are what the mother-child rule works on:

• Jing-Well — Shao Chong HT-09, at the corner of the little fingernail. Wood — the mother of Fire, and therefore this channel's tonification point.
• Ying-Spring — Shao Fu HT-08, in the palm. Fire — Fire on a Fire channel, the horary or self point.
• Shu-Stream — Shen Men HT-07, at the wrist. Earth — the child of Fire, and therefore this channel's sedation point. It is also the channel's Yuan-Source point.
• Jing-River — Ling Dao HT-04, on the forearm. Metal.
• He-Sea — Shao Hai HT-03, at the elbow. Water — the element that controls Fire. This page.

The channel is completed by Tong Li HT-05 as the Connecting point and Yin Xi HT-06 as the Cleft point, both held here. On yin channels the five-shu run Wood, Fire, Earth, Metal, Water from the extremity inward; on yang channels they run Metal, Water, Wood, Fire, Earth — which is why Qu Chi LI-11 and Zu San Li ST-36, both held here, are He-Sea and Earth points while Shao Hai on this yin channel is He-Sea and Water. Among the He-Sea and Water points of the yin channels — a group that also includes Chi Ze LU-05, Yin Ling Quan SP-09, Yin Gu KI-10, Qu Ze P-03 and Qu Quan LIV-08, all held here — Shao Hai is the one whose channel is Fire, and that is what makes its position unique in the set.

Source: Sacred Lotus sources & references (location, channel, He-Sea & Water classification, and the complete Heart-channel five-shu set with element assignments queried directly, alongside the LU-05, SP-09, KI-10, P-03, LIV-08, LI-11 and ST-36 records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 214); Chinese Acupuncture & Moxibustion (pp. 164–165); Ling Shu (Spiritual Pivot), on the five-shu points; PMID 41074530; cross-referenced against multiple online sources.

Where is HT-03 located?

• A Manual of Acupuncture (p. 214): Midway between Quze P-3 and the medial epicondyle of the humerus, at the medial end of the transverse cubital crease when the elbow is fully flexed.
• Chinese Acupuncture and Moxibustion (p. 164-165): With the elbow flexed, at the midpoint of the line connecting the medial end of the cubital crease and the medial epicondyle of humerus.

How is HT-03 Shao Hai needled, and where is the ulnar nerve?

Stated plainly: HT-03 is a low-hazard point. It lies at the inner end of the elbow crease with the humerus close behind it, there is no body cavity, no organ and no great vessel in the needle path, and the depth our records carry — perpendicular 0.5 to 1.0 inch — is an ordinary limb depth rather than a bounded safety figure. The one anatomical fact worth stating precisely is about the ulnar nerve, and it is a correction rather than a warning: the ulnar nerve runs in the groove behind the medial epicondyle, and HT-03 lies in front of it. The elbow point that sits over the ulnar nerve is Xiao Hai SI-08, not this one. Everything below is recorded as neutral reference data describing what the textbooks and the published anatomical literature state. It is not instruction, and this page does not teach technique. Needling is carried out only by a qualified, licensed practitioner.

The angle and depth the texts record

• Sacred Lotus sources & references record perpendicular insertion of 0.5 to 1.0 inch, with moxibustion applicable. That is a standard limb depth, comparable to the figures our records carry for other points of the elbow region, and it is not accompanied by any caution in our record — which is itself the informative fact, given how many points in this library are.
• Deadman & Al-Khafaji (p. 214) and Chinese Acupuncture & Moxibustion (pp. 164–165) record a comparable perpendicular range with the elbow flexed. Neither attaches a hazard caution of the kind both attach to the thoracic, abdominal, orbital and occipital points.
• The elbow is flexed to locate and needle the point. Both our own location records specify a flexed elbow, and the reason is practical: the crease that defines the point only exists when the joint is bent.
• Moxibustion is recorded as applicable and is commonly used, particularly where the arm is cold, weak or painful from cold and damp.

What actually lies beneath — the anatomy of the medial elbow

• The ulnar nerve is behind the epicondyle, not in front of it. The ulnar nerve passes through the cubital tunnel in the groove on the posterior side of the medial epicondyle — the "funny bone" groove, where a knock produces the familiar shock down the little finger. HT-03 sits at the medial end of the anterior elbow crease, on the front of the joint. The nerve is therefore behind and to the side of the point rather than under it. This is stated because the ulnar nerve is often assumed to be the structure at risk at any medial elbow point, and at this particular point it is not the structure directly beneath.
• The point that is over the ulnar nerve is Xiao Hai SI-08. Held in this library, SI-08 lies in the groove between the medial epicondyle and the olecranon — precisely the cubital tunnel. It is one of the most reliably electric points on the body for that reason. The two points are also, unhelpfully, near-homophones: Shao Hai HT-03 and Xiao Hai SI-08, both "sea" names at the same elbow. Distinguishing them is genuinely useful and is set out under the notes below.
• What is in front of the epicondyle. The anterior medial elbow carries the pronator teres and the origin of the forearm flexors, and medial to them the brachial artery and the median nerve run down through the cubital fossa. Those are the structures in the neighbourhood, and they are the reason the recorded technique is perpendicular at a moderate depth rather than deep or angled.
• The only anatomical study naming Shaohai is an animal study, and is labelled as one. A comparative-anatomy investigation dissected the five-shu points of the Heart channel in sixteen rabbits, inserting needles and reconstructing the point regions by CT before dissection. For "Shaohai" HT-03 in the rabbit forelimb it recorded the neighbouring structures as the pronator teres and biceps brachii, the brachial artery and vein, the radial collateral vessels, the medial antebrachial cutaneous nerve and the median nerve (He ZJ et al., Zhen Ci Yan Jiu 2023;48(4):385–391, PMID 37186204). This is a rabbit study, not a study of human anatomy, and it is recorded here only to be clear that it exists and what it is — no measurement from it is presented as a human figure. Notably, even in the rabbit the ulnar nerve is listed at HT-07 and HT-04 but not at HT-03, which is consistent with the human relationship described above.
• No imaging study measuring a safe needling depth at HT-03 could be located, and none is needed in the way it is at the thoracic, abdominal and cranial points: the humerus lies behind the point and there is no cavity to enter.

What the case literature documents in this region

• The ordinary events are minor. Bruising, brief local soreness and, occasionally, a transient electric sensation down the forearm if a needle approaches a cutaneous nerve are what the reference literature records at points of this kind. A meta-analysis of prospective clinical studies found that about half of all recorded acupuncture adverse events across the whole repertoire were bleeding, pain or flare at the needle site (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268).
• Nerve injury at the medial elbow is documented — from a different procedure. A case report describes severe ulnar nerve injury in a 52-year-old man following bee venom acupuncture applied to the medial side of the right elbow and forearm. He developed immediate pain and swelling, then weakness of the little finger and sensory change in the ulnar distribution; electrodiagnostic studies two weeks later confirmed ulnar nerve damage, and he had not recovered fully four months on (Park JS et al., Ann Rehabil Med 2017;41(3):483–487, PMID 28758087, PMC5532355). This was bee venom injection, not filiform needling, and the report does not name HT-03 or any acupoint. It is cited for what it establishes about the region — that the medial elbow contains a nerve that can be injured by an injected substance — and no injury is attributed to this point.
• Honest limit. We could not source any published case report of injury at HT-03, and none is asserted. Where a point is low-hazard, the useful thing is to say so plainly rather than to import a warning from elsewhere, and that is what is done here.

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 (PMID 34489268). Systematic reviews of the Chinese case literature reach the same conclusion about where the events cluster: they concentrate at points over the chest, the abdomen, the neck and the orbit, and are attributed chiefly to improper technique (He W et al., PMID 22967282; Zhang J et al., Bull World Health Organ 2010;88(12):915–921C, PMID 21124716, PMC2995190). HT-03 is not in that group, and the accurate summary is that it is one of the straightforward points of the repertoire.

Source: Sacred Lotus sources & references (existing needling and location records; the SI-08 record queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 214); Chinese Acupuncture & Moxibustion (pp. 164–165); PMID 37186204 (rabbit comparative anatomy); PMID 28758087 (PMC5532355); PMID 34489268; PMID 22967282; PMID 21124716 (PMC2995190) — each verified resolvable and checked for retraction status before citation.

What does the name Shao Hai mean?

Shao Hai means "Lesser Sea" — shao, lesser or minor, and hai, the sea. Sacred Lotus sources & references translate it exactly that way, and the name is a compact statement of the point's classification. The shao is the Shao Yin of the channel's full name, the Heart Channel of Hand Shao Yin — "lesser yin". The hai is the He-Sea position: in the Ling Shu's river image, the five-shu points trace the qi of a channel from a trickling well at the fingertip to a sea at the elbow, and the He-Sea point is where the flow finally turns inward toward the organ. So "Lesser Sea" reads as the sea of the Shao Yin channel — the name says which channel and which of the five positions in one breath.

The shao element runs through this channel's naming: Shao Chong HT-09 ("Lesser Surge") at the fingertip, Shao Fu HT-08 ("Lesser Mansion") in the palm, and Shao Hai at the elbow. Three of the Heart channel's nine points carry it, and reading them in order — surge, mansion, sea — follows the same river the five-shu scheme describes.

Is HT-03 the Heart channel's sedation point?

No — and working out why from first principles is the most useful thing on this page. The reasoning has two layers, and separating them is what makes it stick.

The first layer is the five-shu position. HT-03 is the He-Sea point: the last of the five, the deepest, the place the Ling Shu describes as the qi entering inward. He-Sea points are classically indicated for disorders of their own organ and for rebellious qi. That is a statement about indication, and it tells you nothing about tonification or sedation.

The second layer is the element. On yin channels the He-Sea point is a Water point; on yang channels it is an Earth point — which is why Qu Chi LI-11 and Zu San Li ST-36, both held here, are He-Sea and Earth points while Shao Hai on this yin channel is He-Sea and Water. The Heart is a yin channel of the Fire phase. Now apply the rules:

• In the generating cycle, Wood produces Fire and Fire produces Earth. So the mother of Fire is Wood and the child of Fire is Earth.
• Under the mother-child rule, a channel is supplemented through its mother point and drained through its child point. On the Heart channel that gives: tonification (mother) point — HT-09 Shao Chong, the Jing-Well and Wood point; sedation (child) point — HT-07 Shen Men, the Shu-Stream and Earth point, which is also the channel's Yuan-Source point.
• The horary (self) point is the one whose element matches the channel's own: HT-08 Shao Fu, Fire on a Fire channel.
• Water is none of those. In the controlling cycle, Water controls Fire. So HT-03, the Water point of a Fire channel, is the channel's controlling-element point — the place where Fire is met by what restrains it, rather than fed by its mother or drained through its child.

The distinction students most often get wrong is assuming that the He-Sea point, or any heat-clearing point, must be the sedation point. It depends entirely on the channel's own element. On the Lung, a Metal channel, the He-Sea and Water point LU-05 Chi Ze is the child and so is the sedation point. On the Liver, a Wood channel, the He-Sea and Water point LIV-08 Qu Quan is the mother and so is the tonification point. On the Heart, a Fire channel, the He-Sea and Water point is neither. Our LU-05, LIV-08, HT-07, HT-08, P-08 and SJ-10 records each set out the same rule from their own side, and every one of them arrives at it the same way: five-shu position gives the classical indication, the element's relationship to the channel gives the tonification-sedation role, and the two coincide only by arithmetic.

How is HT-03 different from Xiao Hai SI-08?

They are two different points at the same elbow with names that sound almost identical, and confusing them is the commonest error at this location. Held separately in Sacred Lotus sources & references:

• Shao Hai HT-03 — "Lesser Sea". Heart channel, yin, on the front of the elbow at the inner end of the crease. He-Sea and Water point. Used for the Heart, the spirit, arm pain and tremor, and scrofula.
• Xiao Hai SI-08 — "Small Sea". Small Intestine channel, yang, on the back of the elbow in the groove between the bony knob and the point of the elbow — the ulnar nerve groove. He-Sea and Earth point, because on a yang channel the He-Sea point is Earth. Used for elbow and arm pain, neck and shoulder pain, and it is the point most reliably associated with an electric sensation down the little finger.

The pair is a good illustration of the whole five-shu system in miniature: same joint, same "sea" position, different channel polarity — and therefore different elements, different classifications and different uses. The Heart and Small Intestine are also interior-exterior partners, which is why their channels arrive at the same joint from opposite sides.

Is there research on HT-03 Shao Hai?

The honest answer is that HT-03 has essentially no modern clinical research of its own. The single most point-specific published finding about it comes from the classical corpus rather than from a trial — and it is a good one.

• The classical record names this point for one indication in particular. Researchers at the China Academy of Chinese Medical Sciences data-mined the earliest recorded ancient acupuncture and moxibustion prescriptions for chest obstruction and heart pain, normalising the terminology and analysing acupoint selection by frequency and association rules. The high-frequency base points were Da Ling P-07, Nei Guan P-06, Tai Xi KI-03, Tai Chong LIV-03, Shang Wan CV-13, Yong Quan KI-01 and Xin Shu BL-15. Within that record one association stood out for this page: "Shaohai (HT3) was invariably selected when hand tremor was accompanied" (Zhongguo Zhen Jiu 2025;45(10):1505–1511, PMID 41074530). Our own indication record for this point carries "tremor of the hand", and the classical analysis confirms it from an entirely independent direction. That is about as close to a point-specific validation of a traditional indication as this literature offers.
• An animal anatomical study. The rabbit comparative-anatomy study of the Heart channel's five-shu points described under needling (PMID 37186204) is the only anatomical work we could find that names Shaohai. It is a rabbit study and is labelled as one; it establishes nothing about human anatomy or about clinical effect.
• What is not here. We could locate no randomised trial of HT-03, no sham-controlled study of it, and no clinical study in which it is the point under test. Where it appears in modern protocols it is one point among many, and nothing in those studies is attributable to it. Rather than cite whole-protocol trials as though they concerned this point, the accurate statement is that HT-03's evidence base is the classical record and the reference literature.

How does HT-03 compare with the points around it?

Shen Men HT-07 at the wrist is the Heart channel's default point — Shu-Stream, Earth, Yuan-Source, and the channel's sedation point — and where the aim is to calm the spirit rather than to treat the arm, HT-07 is the point chosen, not this one. Shao Fu HT-08 in the palm is the Ying-Spring and Fire point, the horary point, and the channel's most directly heat-clearing point. Shao Chong HT-09 at the fingertip is the Jing-Well and Wood point, the tonification point, and the acute reviving choice. Ling Dao HT-04, Tong Li HT-05 and Yin Xi HT-06 occupy the forearm between wrist and elbow, with HT-05 the Connecting point and HT-06 the Cleft point. Above HT-03 on the same channel, Qing Ling HT-02 and Ji Quan HT-01 run up to the armpit. Across the elbow crease, Qu Ze P-03 is the Pericardium's He-Sea and Water point in the middle of the fossa — the same classification on the neighbouring yin Fire channel — and Chi Ze LU-05 is the Lung's, at the outer end. Qu Chi LI-11 is the He-Sea and Earth point at the lateral end of the same crease. And Xiao Hai SI-08, behind the elbow, is the point most often confused with this one, for the reasons set out above. All are held in Sacred Lotus sources & references.

Source: Sacred Lotus sources & references (name, translation, channel, He-Sea & Water classification, the complete Heart-channel five-shu set with element assignments, and the SI-08, P-03, LU-05, LIV-08, LI-11, ST-36, HT-01, HT-02, HT-04, HT-05, HT-06, HT-07, HT-08 and HT-09 records queried directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 214); Chinese Acupuncture & Moxibustion (pp. 164–165); Ling Shu (Spiritual Pivot), on the five-shu points; Nan Jing (Classic of Difficulties), on the five-shu indications and the mother-child rule; PMID 41074530; PMID 37186204 (rabbit study) — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.