Point Category Point Category

Lower He-Sea Points

下合穴 Xià Hé Xué
Also known as: Six Fu Lower He-Sea Points · Lower Uniting Points · Lower Sea Points · Liu Fu Xia He Xue (六腑下合穴)

A special category of six acupuncture points on the lower legs where the Qi of the six Yang (Fu) organs converges with the three Yang meridians of the foot. These points are specifically used to treat disorders of their corresponding Fu organs.

下合穴

Xià Hé Xué

Lower He-Sea Points

Educational content · Consult qualified TCM practitioners for diagnosis and treatment

Overview

The Lower He-Sea Points (下合穴, Xià Hé Xué) are a special category of six acupuncture points located on the leg where the energy of the six Fu organs (hollow organs) meets and "joins" the three Yang meridians of the foot. Think of these points as special communication hubs where each hollow organ can be accessed and treated through needling on the lower leg.

The concept is based on the classical principle "合治内腑" (hé zhì nèi fǔ) - meaning "the He-Sea points treat the internal Fu organs." In TCM, the six Fu organs (Stomach, Large Intestine, Small Intestine, Gallbladder, Bladder, and San Jiao/Triple Burner) are hollow organs responsible for receiving, transforming, and transmitting food and waste. Because these organs are located in the abdomen but have a strong energetic connection to the lower limbs, these special points were identified as powerful treatment sites for digestive and urinary conditions.

What makes this point category unique is that while three of the Fu organs (Stomach, Gallbladder, Bladder) have their Lower He-Sea points on their own meridians, the other three (Large Intestine, Small Intestine, San Jiao) have points on different meridians. This is because the arm Yang meridians cannot effectively reach the abdominal organs, so additional "proxy" points were designated on the leg meridians.

Historical Context

The Lower He-Sea Points have their theoretical foundation in the Ling Shu (Miraculous Pivot), one of the two parts of the Huang Di Nei Jing (Yellow Emperor's Inner Classic), dating to approximately 200 BCE-200 CE. Chapter 4 (Xie Qi Zang Fu Bing Xing) specifically states that when disease is in the Fu organs, one should select the He-Sea points, establishing the "合治内腑" (He-Sea points treat internal Fu organs) principle.

The specific list of points and their organ correspondences appears in the Ling Shu and was later elaborated in the Zhen Jiu Jia Yi Jing (Systematic Classic of Acupuncture and Moxibustion) by Huang Fu Mi around 259 CE, which further explained why the San Jiao's lower point is on the Bladder meridian. The Su Wen (Plain Questions) chapter on coughing (Ke Lun) reinforced this by stating that coughs of the Fu organs should be treated with He-Sea points, while coughs of the Zang organs use Shu-Stream points.

Comparison

Zusanli ST-36

足三里

Fu Organ: Stomach
Meridian: Stomach (own meridian)
Location: 3 cun below the knee, one finger-width lateral to the tibia
Key Indications: Stomach pain, nausea, vomiting, digestive weakness, general tonification

Shangjuxu ST-37

上巨虚

Fu Organ: Large Intestine
Meridian: Stomach (not own meridian)
Location: 6 cun below the knee, one finger-width lateral to the tibia
Key Indications: Appendicitis, dysentery, diarrhea, constipation, intestinal abscess

Xiajuxu ST-39

下巨虚

Fu Organ: Small Intestine
Meridian: Stomach (not own meridian)
Location: 9 cun below the knee, one finger-width lateral to the tibia
Key Indications: Lower abdominal pain, diarrhea, small intestine disorders

Yanglingquan GB-34

阳陵泉

Fu Organ: Gallbladder
Meridian: Gallbladder (own meridian)
Location: In the depression anterior and inferior to the head of the fibula
Key Indications: Hypochondriac pain, bitter taste, jaundice, gallstones, also Influential point for sinews

Weizhong BL-40

委中

Fu Organ: Bladder
Meridian: Bladder (own meridian)
Location: Midpoint of the popliteal crease (back of knee)
Key Indications: Urinary disorders, lower back pain, clears summer-heat, skin disorders

Weiyang BL-39

委阳

Fu Organ: San Jiao (Triple Burner)
Meridian: Bladder (not own meridian)
Location: Lateral to Weizhong BL-40, medial to the biceps femoris tendon
Key Indications: Urinary retention, edema, San Jiao Qi transformation disorders

He Zhi Nei Fu

合治内腑

The foundational principle meaning "the He-Sea points treat internal Fu organs." This classical dictum from the Ling Shu establishes that these specific points are the primary acupoints for treating disorders of the hollow Yang organs. It reflects the understanding that channel Qi becomes deep and abundant at these locations, making them ideal for influencing internal organ function.

Six Fu Correspondence

六腑对应

Each of the six Fu organs has one designated Lower He-Sea point. The Stomach, Gallbladder, and Bladder use their own meridian's He-Sea (合穴) points. The Large Intestine and Small Intestine share points on the Stomach meridian because they functionally "belong to the Stomach." The San Jiao's point is on the Bladder meridian because both organs are involved in water metabolism.

Qi Descends to Lower Limbs

六腑皆出足之三阳

The Qi of all six Fu organs descends and converges on the three Yang meridians of the leg. This is why all Lower He-Sea points are located below the knee - the channel Qi at this level is deep, abundant, and strongly connected to the internal organs. Like rivers joining the sea, the Qi gathers and becomes more powerful at these locations.

Tong Jiang Fu Qi

通降腑气

These points are used to promote the descending and moving function of the Fu organs. Since Fu organs should continuously receive, transform, and discharge, the Lower He-Sea points help restore proper movement and flow when there is stagnation, accumulation, or rebellious (upward-moving) Qi in these organs.

Practical Application

Point Selection by Organ: In clinical practice, practitioners select the appropriate Lower He-Sea point based on which Fu organ is affected. For stomach disorders (gastritis, nausea, vomiting), use Zusanli ST-36. For large intestine problems (constipation, diarrhea, appendicitis), use Shangjuxu ST-37. For gallbladder issues (cholecystitis, hypochondriac pain), use Yanglingquan GB-34. For bladder disorders (urinary retention, painful urination), use Weizhong BL-40.

Diagnostic Use: These points can also assist in diagnosis. Tenderness or unusual sensations at a Lower He-Sea point may indicate pathology in the corresponding organ. For example, marked tenderness at Shangjuxu ST-37 may suggest appendicitis or other large intestine disorders.

Combination Strategies: Lower He-Sea points are commonly combined with Front-Mu points (on the abdomen) and Back-Shu points (on the back) for comprehensive treatment of Fu organ disorders. For acute conditions, they may be paired with Xi-Cleft points for stronger therapeutic effect.

Clinical Relevance

The Lower He-Sea Points remain among the most clinically important point categories in modern acupuncture practice, particularly for gastrointestinal disorders. Research has shown these points are frequently used in treating conditions such as postoperative ileus (paralysis of intestinal movement after surgery), with studies finding that these three Stomach meridian points account for 44% of acupoint usage in treating this condition.

Common clinical applications include: Zusanli ST-36 for stomach pain and general digestive weakness; Shangjuxu ST-37 for intestinal abscess, dysentery, and inflammatory bowel conditions; Xiajuxu ST-39 for lower abdominal pain and diarrhea; Yanglingquan GB-34 for gallbladder inflammation and bitter taste in the mouth; Weizhong BL-40 and Weiyang BL-39 for urinary disorders and San Jiao dysfunction causing fluid retention.

An important practical advantage is that these points, located on the lower legs, are easily accessible even in patients who have undergone abdominal surgery or have abdominal sensitivity, making them valuable in perioperative care.

Common Misconceptions

Confusion with regular He-Sea Points: The most common misunderstanding is conflating Lower He-Sea points with the standard He-Sea (合穴) points of the Five Shu point system. While three points (ST-36, GB-34, BL-40) serve both functions, the categories are distinct. The Five Shu He-Sea points exist on all twelve main meridians, while Lower He-Sea points specifically relate to treating the six Fu organs and only number six points total.

Assuming all points are on their own meridians: Many students assume each organ's Lower He-Sea point would be on that organ's corresponding meridian. In fact, only Stomach, Gallbladder, and Bladder have points on their own meridians. Large Intestine and Small Intestine points are on the Stomach meridian, and San Jiao's point is on the Bladder meridian. This reflects the classical understanding of functional relationships between organs rather than simple anatomical correspondence.

Thinking these points only treat digestive issues: While primarily used for Fu organ disorders, these points have broader applications. For example, Yanglingquan GB-34 is also the Influential point for sinews and treats musculoskeletal conditions; Weizhong BL-40 is a key point for lower back problems.

Organizing Principle

The Lower He-Sea Points are organized around one central principle: each of the six Fu (hollow) organs has its Qi converging at a specific point on the lower leg, and these points are the primary treatment sites for that organ's disorders.

The organizing logic follows the relationships described in classical texts: the Stomach, Gallbladder, and Bladder naturally have their He-Sea points on their own meridians because these meridians run through the legs. However, the Large Intestine, Small Intestine, and San Jiao meridians run through the arms, meaning their regular He-Sea points (at the elbow) cannot effectively reach the abdominal organs. Therefore, additional "lower" points were designated - the Large Intestine and Small Intestine connect via the Stomach meridian (since both "belong to the Stomach" functionally), while the San Jiao connects via the Bladder meridian (since both manage water metabolism).

Clinically, these points are selected based on which Fu organ is affected. For example, stomach pain would indicate Zusanli ST-36; appendicitis or intestinal abscess would call for Shangjuxu ST-37 (Large Intestine); and gallbladder disorders would require Yanglingquan GB-34.

Classical Sources

Ling Shu (Miraculous Pivot)

Chapter 4 - Xie Qi Zang Fu Bing Xing

胃合于三里,大肠合于巨虚上廉,小肠合于巨虚下廉,三焦合于委阳,膀胱合于委中,胆合于阳陵泉

The Stomach joins at Zusanli, the Large Intestine joins at Shangjuxu, the Small Intestine joins at Xiajuxu, the San Jiao joins at Weiyang, the Bladder joins at Weizhong, the Gallbladder joins at Yanglingquan.

Ling Shu (Miraculous Pivot)

Chapter 4 - Xie Qi Zang Fu Bing Xing

合治内腑

The He-Sea points treat the internal Fu organs.

Ling Shu (Miraculous Pivot)

Chapter 2 - Ben Shu

六腑皆出足之三阳,上合于手者也

The six Fu organs all emerge at the three Yang meridians of the foot, and join above with the hand [meridians].

Su Wen (Plain Questions)

Chapter 38 - Ke Lun (On Cough)

治腑者治其合

To treat the Fu organs, treat their He-Sea [points].

Modern References

The lower He-sea points playing a significant role in postoperative ileus in colorectal cancer treated with acupuncture: based on machine-learning

Zhang X, et al. (2023)

Frontiers in Oncology research showing Lower He-Sea points account for 44% of acupoint usage in treating postoperative ileus.

Lower He-sea sequence and indication specificity analysis regarding Zusanli (ST 36), Shangjuxu (ST 37) and Xiajuxu (ST 39)

PubMed research (2016)

Analysis of the relationship between point sequence and anatomical organ positions.

Concept and terminology study on Xiahe points (lower confluent point)

Zhao JS, China Academy of Chinese Medical Sciences (2010)

Zhongguo Zhen Jiu article analyzing the terminology and conceptual clarity of Lower He-Sea points.