GB21

Gallbladder Channel

Shoulder Well

肩井Jiān Jǐng

Contraindicated during pregnancy

Strong downward movement of Qi; the shoulder pulls on the uterine axis. Prohibited throughout pregnancy.

Anatomical location

At the highest point of the shoulder, at the midpoint of the line connecting GV14 (Dazhui) with the acromion.

Main function

Regulates Qi and Blood, relieves shoulder pain.

  • Crossing point with the Triple Energizer and Yang Wei Mai

Therapeutic indications

  • Shoulder pain
  • stiff neck
  • mastitis
  • shoulder and neck pain and stiffness
  • trapezius contracture
  • insufficient lactation
  • scrofula
  • hypertension
  • upper back pain
  • difficult labor at term
  • tension headache

Name and classical tradition

Jianjing, 肩井, is the "Shoulder Well." 肩 is the shoulder, 井 the well: the point lies in the deep depression of the trapezius, at the top of the shoulder, and the image of the mouth of a well is easy to recognize on palpation.

It was not always called this. The Suwen (Basic Questions), in the Qi Xue Lun (气穴论) chapter, records it as 肩解. It was the Zhenjiu Jiayi Jing (Systematic Classic of Acupuncture and Moxibustion), in the third century, that fixed 肩井, and that name became the standard. The character 解 in the old name has been interpreted in two ways: as "joint," what separates and bends, which is the more anatomical reading, or as "to dissolve," referring to the point's capacity to break up stagnation. The second is a modern gloss without a citation. The reference works also give it the name 膊井, "Arm Well."

Jianjing is a point where many channels meet: the Hand Shaoyang, the Foot Shaoyang, the Foot Yangming, and the Yang Wei Mai.

Location of point GB21, Shoulder Well
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View point on the 3D modelGB21 on the anatomy
Needling techniqueOblique insertion 0.5-0.8 cun downward.
Depth0.5-0.8 cun
MoxibustionApplicable (5-10 minutes, indirect moxa)
PrecautionsAvoid deep needling so as not to cause pneumothorax.
Cover of the guide “Protocols for the 20 most common patterns”

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Protocols for the 20 patterns you see most in practice

Each pattern with its tongue, its pulse, the treatment principle and the points to tonify and disperse. Made for the treatment table, not the bookshelf.

Do you use GB21 with your patients?

In the Clinic you record it in the patient's file, next to the tongue, the pulse and the measurements, so at the next session you know exactly what you used. The Atlas is built in.

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