Fenglong (ST40): The Acupoint for Phlegm, Digestion, and Mental Clarity
Published 2026-06-02 · 371 words · Acupressure
Fenglong (ST40) is a key acupoint on the Stomach Meridian of Foot Yangming. Located on the lower leg, it is known as the 'Luo-Connecting' point of the Stomach Meridian, linking it with the Spleen Meridian. In Traditional Chinese Medicine (TCM), Fenglong is primarily used to harmonize Stomach Qi, transform phlegm-dampness, and clear the Shen (spirit).
Fenglong is located on the anterolateral aspect of the lower leg, 8 cun (body inches) above the external malleolus (ankle bone), in a depression between the tibia and fibula.
To find Fenglong, measure 8 cun upward from the tip of the lateral malleolus along the anterior border of the fibula. The point lies in a natural depression that can be felt when pressing into the muscle.
Fenglong is renowned for its wide range of therapeutic applications, particularly those involving phlegm, digestive issues, and mental disturbances. Key indications include:
In TCM theory, Fenglong is the primary point for transforming phlegm (化痰). It harmonizes the Stomach and Spleen, regulates Qi flow, and clears dampness. It is also used to calm the Shen when phlegm obstructs the heart or mind, leading to symptoms like confusion, palpitations, or insomnia.
Fenglong can be stimulated using acupressure, acupuncture, or moxibustion. For acupressure, apply firm, steady pressure with the thumb or index finger for 1–3 minutes. Massaging in a circular motion may enhance the effect. Avoid pressing if there is a local skin injury, infection, or if the area is bruised.
Acupressure on Fenglong is generally safe, but should be performed gently during pregnancy. If you have a bleeding disorder or are taking anticoagulants, consult a qualified TCM practitioner before applying strong pressure.
References
1. Huangdi Neijing (Yellow Emperor's Inner Classic) – Lingshu, Chapter 10: Describes Luo-connecting points including Fenglong (ST40) and its indications for phlegm and digestive disorders.
2. Zhenjiu Dacheng (Great Compendium of Acupuncture and Moxibustion) – 1601: Details Fenglong's location, functions, and clinical applications for cough, asthma, and mental restlessness.
3. Bencao Gangmu (Compendium of Materia Medica) – 1596: Although primarily herbal, it references the concept of phlegm and the role of acupoints in transforming phlegm-dampness.
4. A Manual of Acupuncture (Deadman, Al-Khafaji, & Baker, 2007): Modern English reference confirming location and indications of Fenglong (ST40).