Fenglong Acupoint (ST40)

1. Location of Fenglong (ST40)

• Meridian: Stomach Meridian of Foot-Yangming.
• International Code: ST40.
• Anatomical Location: On the lower leg, 8 cun superior to the lateral malleolus, approximately one finger-breadth lateral to the anterior crest of the tibia, in the groove between the tibialis anterior and extensor digitorum longus muscles.

How to locate: Measure 8 cun (proportional to the patient’s own body) upward from the prominence of the lateral malleolus, and about one finger-breadth lateral to the tibia — the point lies in a noticeable muscular depression.

2. Meaning of the Name "Fenglong" (丰隆)

• “Feng” (Wind) implies movement and turbulence.
• “Long” (Thunder) symbolizes strong force and disruption.
  → The name implies: This point disperses turbid phlegm like thunder disperses clouds. It is one of the most important points for resolving phlegm in the entire body.

3. Therapeutic Effects of Fenglong (ST40)

Main functions:

• Resolves phlegm and dampness.
• Tonifies the Spleen and regulates Qi.
• Opens the chest and clears the mind.
• Harmonizes the Stomach.

Commonly treated conditions:

4. Methods of Stimulating ST40

• Acupuncture: Insert needle perpendicularly 1.0–1.5 cun. A sensation of heaviness or radiating warmth may indicate effective needling.
• Acupressure: Use the thumb to apply firm circular pressure for 1–3 minutes. Combine with slow breathing.
• Moxibustion: Apply moxa heat above the point to dispel cold, dry dampness, and invigorate the Spleen.

⚠️ Precautions: Avoid needling if the area is infected, inflamed, or if the patient has unconfirmed acute conditions.

5. Point Combinations with ST40

6. ST40 in Traditional Chinese Medical Theory

In TCM, "phlegm" is not only the visible mucus but also includes invisible turbid substances known as "internal phlegm" or "substantial phlegm" — often involved in mental disorders, chronic diseases, or metabolic issues.
Fenglong (ST40) is the primary empirical point for clearing such phlegm throughout the body.