Amit Kapoor
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14 Jun, 2025
ST-40 Fenglong: The Versatile Acupuncture Point Beyond Phlegm Resolution
Introduction
ST-40 Fenglong stands as one of the most clinically significant acupuncture points in Traditional Chinese Medicine, yet its therapeutic potential extends far beyond its well-known reputation as the primary "phlegm point" [1][2]. Located on the Stomach meridian of Foot-Yangming, this remarkable acupoint deserves recognition for its multifaceted clinical applications and profound therapeutic effects [3][4].
Point Location and Anatomy
ST-40 Fenglong is strategically positioned 8 cun superior to the tip of the external malleolus, approximately two finger-breadths lateral to the anterior border of the tibia [5][4]. More precisely, it sits at the midpoint between Dubi (ST-35) and Jiexi (ST-41), one finger-width lateral to Tiaokou (ST-38) [4]. The point is located on the bulge of the fibularis longus muscle, which gives meaning to its name "Fenglong" - literally translating to "Abundant Bulge" [1][2].
The term "feng" carries deeper significance beyond its anatomical reference, as it denotes the quality of Yang Ming channels being "rich in Qi and Blood," highlighting the point's capacity for invigorating the channels [1][2].
Primary Actions and Functions
1. Resolving Phlegm and Dampness
As the Luo-connecting point of the Stomach channel, ST-40 serves as the premier point for resolving phlegm throughout the body in all its manifestations [1][3][4]. This includes both substantial phlegm, such as abundant chest expectoration, lumps under the skin, thyroid nodules, and uterine fibroids, as well as non-substantial phlegm that clouds the mind and obstructs mental clarity [1][4].
2. Opening the Chest and Subduing Rebellious Qi
ST-40 demonstrates remarkable efficacy in opening the chest and promoting the descending of Lung-Qi [1][2]. This action makes it particularly valuable for treating asthma, not merely for its phlegm-eliminating properties, but for its ability to regulate Qi flow in the chest area [1]. Clinical practitioners often combine ST-40 with Neiguan (P-6) and Lieque (LU-7) for enhanced respiratory benefits [1][2].
3. Calming the Mind and Mental Health Applications
Perhaps one of the most underappreciated aspects of ST-40 is its profound effect on mental and emotional well-being [1][2]. Historical texts, including "An Explanation of Acupuncture Points" from 1624, specifically mention its use for eliminating phlegm from the Heart's orifices, particularly in treating Kuang syndrome (the manic phase of bipolar disorder) [1][2].
The point effectively addresses anxiety, fears, phobias, and various mental disturbances, whether caused by phlegm misting the mind or rebellious Qi [1][4]. Modern research supports these applications, showing that acupuncture at Fenglong can activate the cerebellum, precentral gyrus, and insular lobe brain regions [6].
4. Invigorating the Channels
As a Luo point, ST-40's pathway flows up the leg, joins with the Spleen channel, continues to the nape of the neck and head where it converges with other channel Qi, then flows down to the throat [1][2]. This extensive pathway explains its effectiveness in treating chronic neck pain when combined with Stomach disharmony [1][2].
Clinical Applications
Respiratory Conditions
· Asthma and wheezing [3][4][7]
· Cough with profuse sputum [1][4]
· Chest oppression and breathing difficulties [1][3]
Mental and Emotional Disorders
· Depression and anxiety [3][4][8]
· Manic-depressive episodes [1][3]
· Mental restlessness and inappropriate behavior [1][4]
Digestive Issues
· Stomach disharmony with epigastric tightness [1][2]
· "Butterflies in the stomach" sensation [1]
· Rebellious Stomach Qi [1][4]
Musculoskeletal Problems
· Chest and rib injuries [1][2]
· Chronic neck pain (when combined with Stomach issues) [1][2]
· Lower leg muscle atrophy and weakness [1][3]
Cardiovascular Applications
Through its influence on the Xu Li (Great Luo of the Stomach), ST-40 can affect heart rate and rhythm, making it valuable for treating irregular pulse patterns [1][2].
Needling Technique and Combinations
ST-40 should be needled perpendicularly 0.5 to 1.5 cun deep [5][4][9]. For phlegm-related conditions, the point is typically needled with reducing method [1]. Common point combinations include:
· ST-40 + P-6 (Neiguan): For chest problems, anxiety, and respiratory issues [1][4]
· ST-40 + LU-7 (Lieque): For asthma and lung conditions [1]
· ST-40 bilateral: For chronic neck pain with Stomach disharmony [1]
Modern Research and Evidence
Contemporary studies have validated many traditional uses of ST-40. Research demonstrates its effectiveness in treating vertigo through improved cerebral blood flow and activation of specific brain regions [6]. Additionally, studies on depression treatment frequently include ST-40 in acupoint prescriptions, supporting its traditional role in mental health applications [8].
Conclusion
ST-40 Fenglong exemplifies the sophisticated understanding of acupoint therapy in Traditional Chinese Medicine [1][2]. While universally recognized for resolving phlegm, its clinical versatility extends to mental health, respiratory function, digestive harmony, and cardiovascular regulation [1][3][4]. Understanding these diverse applications allows practitioners to harness the full therapeutic potential of this remarkable acupoint, moving beyond the singular focus on phlegm resolution to embrace its comprehensive healing capabilities [1][2].
The point's name "Abundant Bulge" truly reflects its abundant therapeutic possibilities, making it an indispensable tool in the acupuncturist's clinical arsenal [1]. As Giovanni Maciocia emphasizes, the phlegm-resolving effect should not overshadow ST-40's other valuable functions, each contributing to its status as one of acupuncture's most versatile and clinically significant points [1][2].
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1. https://giovanni-maciocia.com/st-40-fenglong/
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC11235460/
3. https://yinyanghouse.com/theory/acupuncturepoints/st40/
4. https://www.meandqi.com/tcm-education-center/acupuncture/stomach-channel/fenglong-st-40
5. https://www.mastertungacupuncture.org/acupuncture/traditional/points/st40
6. https://www.youtube.com/watch?v=IAn0ApdaceY
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC10163884/
Amit Kapoor
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