REN-20 (Hua Gai) Florid Canopy

What does REN-20 Hua Gai do?

REN-20 unbinds the chest and regulates and descends qi — a sternal point at the sternal angle, and its name is a classical name for the Lung itself.

• Unbinds the chest — opening a constrained chest
• Regulates and descends qi — settling rebellious qi, behind its use for cough and asthma

The name is a name for the Lung. “Hua Gai” means Florid Canopy or Flowery Canopy — and “the florid canopy” is a classical epithet for the Lung, the organ that spreads over and covers the others like a canopy. So REN-20 is a chest point whose very name invokes the Lung, and its cough-and-asthma indications follow directly. It sits high on the breastbone, over the region of the lungs, among the sternal Ren points.

At a definite bony landmark. REN-20 lies at the sternal angle (the angle of Louis) — the ridge where the manubrium meets the body of the sternum, level with the 2nd ribs and the 1st rib space. This is one of the most reliable landmarks on the front of the chest, felt as a distinct transverse ridge; the 2nd rib joins the sternum right there, which is how the rib spaces are counted.

On the name. “Hua Gai” — Florid Canopy, the Lung, as noted above.

Source: Sacred Lotus sources & references (channel, action, location and translation records; the neighbouring sternal Ren points queried against our own data), cross-referenced against multiple online sources.

What is REN-20 Hua Gai used for?

REN-20 is used for pain and fullness in the chest and sides, asthma, and cough. Our own indication record is reproduced here in full.

• Pain and fullness in the chest and intercostal (side) region
• Asthma (wheezing, laboured breathing)
• Cough

Chest and breath, fitting a “Lung” point. Chest-and-side pain and fullness are the chest-unbinding action; asthma and cough are the descend-qi action reaching the lung — and the point named for the Lung carries exactly the lung indications. It is a tightly respiratory list.

An honest and important note. Asthma is a serious condition requiring medical management; a severe attack is life-threatening. Acupuncture is not a substitute for inhalers or medical asthma care. Chest pain or fullness requires assessment to exclude cardiac and other serious causes. A cough lasting more than three weeks, or with blood or breathlessness, requires assessment. This record documents classical use only.

How it is combined. With REN-17 Shan Zhong and the sternal Ren points, and with LU-01 Zhong Fu and LU-07 Lie Que for the lung. All held here.

Source: Sacred Lotus sources & references (indication and action records; the LU-01, LU-07 and REN-17 records queried from our own data), cross-referenced against multiple online sources.

Where is REN-20 Hua Gai located?

REN-20 is on the midline of the upper breastbone, at the sternal angle, level with the first rib space.

• On the anterior midline
• At the sternal angle — the palpable ridge where the manubrium meets the body of the sternum
• Level with the 1st intercostal space (the 2nd rib joins the sternum at the angle)

The sternal angle is the landmark, and a reliable one. Running a finger down from the top of the breastbone, the first distinct transverse ridge is the sternal angle; REN-20 sits on the midline there. Because the 2nd rib attaches at the angle, this landmark is the starting point for counting rib spaces on the whole front of the chest. It is one space above REN-19 Zi Gong and below REN-21 Xuan Ji.

On the name. “Hua Gai” — Florid Canopy, the Lung, as noted above.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged; the REN-21 record queried from our own data).

• A Manual of Acupuncture (p. 520): On the midline of the sternum, level with the junction of the first intercostal space and the sternum.
• Chinese Acupuncture and Moxibustion (p. 240): On the anterior midline, at the midpoint of the sternal angle, at the level with the first intercostal space.

How is REN-20 Hua Gai needled?

Our own record states subcutaneous insertion of 0.3–0.5 inch, with moxibustion applicable — the flat technique the breastbone calls for. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: subcutaneous, 0.3–0.5 inch, threaded flat along the breastbone.
• Moxibustion: recorded as applicable.
• Why flat, not perpendicular: the sternum lies immediately beneath; and a possible sternal foramen (congenital hole in the breastbone) means a deep perpendicular needle could pass through toward the structures behind. The subcutaneous technique avoids both.
• Regional anatomy: the point lies over the sternal angle; the internal thoracic vessels run behind the sternum to each side; the aortic arch and great vessels lie behind the manubrium.

Hazard, stated proportionately. With subcutaneous needling over bone this is a low-hazard point — the breastbone shields the organs behind it, so there is no pneumothorax route here, unlike the intercostal chest points. The sternal foramen is why the needling is kept flat. Our record carries no arterial caution at REN-20, and it is not among the nine points that do.

What is not claimed. No study measuring a safe depth at REN-20 could be located, and none is needed at a subcutaneous depth over bone. No case report naming REN-20 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged; the nine arterial cautions queried from our own data), cross-referenced against multiple online sources; regional anatomy, including the sternal foramen note, from standard anatomical description.

Is there research on REN-20, and what should a reader know?

No trial isolates REN-20. Where the point appears it is one component of a chest or respiratory protocol, and a study that includes a point in a protocol is not evidence about that point.

What this page can state with confidence. REN-20 Hua Gai (“Florid Canopy”) is a sternal Conception-vessel point at the sternal angle — a definite bony landmark — that unbinds the chest and regulates and descends qi, with respiratory indications (cough, asthma, chest fullness). Its name is a classical epithet for the Lung, fitting its lung action. It is needled subcutaneously over the breastbone, with no pneumothorax risk.

A safety note. Asthma and chest pain are matters for medical care; this page records classical use and says so.

A note on searching for it. “REN 20”, “CV 20” and “Huagai” searches return protocol trials and unrelated material — and “Huagai” is itself the classical word for the Lung and a literary term, so it appears widely. Any claim attached to this point should be checked against what a study actually used.

Source: Sacred Lotus sources & references (action, indication and location records; the neighbouring sternal Ren points queried, against our own data).