UB 40

Acupuncture Point Theory

UB 40 Acupuncture Point Applications and Theory

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The acupuncture point "UB 40" , 委中, is represented by "Wei Zhong" in pinyin and "Bend Middle" in english and may be found:

Midpoint of the transverse crease of the popliteal fossa, between the tendons of biceps femoris and semitendinosis.


Of many possible clinical applications, it may be considered to influence the following issues/symptoms:

  • As the Lumbar Command Point, useful for all lumbar related issues: acute low back pain, sprain, muscle spasms, etc.
  • Main point for heat conditions such as summer heat, heatstroke and heat exhaustion.  Nightsweats in some cases from deficiency.
  • Main point for all skin related issues: itching, oozing, inflammation, eczema, etc.
  • Good local point for hip, leg a/or knee pain.

UB 40 has some precautions to be considered (see our precautions list).

Avoid Moxa (MX)
No moxa, not even pole/stick moxibustion.


Ub 40 has the following theoretical associations which serve as important guideposts in designing an effective treatment protocol:

Explore ub 40 functional groupings theory - Command Point and/or Lower He Sea, or read all point categories and related theory.

A single acupuncture point is not commonly thought of as an empirical way to influence a TCM diagnostic pattern. UB40, however, is a strong candidate to be incorporated into an acupuncture protocol for patients who exhibit: Summer Heat

UB 40 may potentially be used, in coordination with a well designed acupuncture treatment protocol, to influence the following conditions: Back Pain, Heat Stroke, Itching, Knee Pain, Night Sweats (Sleep Hyperhidrosis) and/or Skin Problems (Rash)

While not necessarily valid clinically, EX Heding (Knee issues - pain, stiffness, tension), EX Xiyan ( All knee disorders - pain, inflammation, etc.…), KD 10 (Clears damp or damp-heat in the lower warmer - ur…), LV 8 (Tonify LV Yin and Blood, clears excess heat patte…), ST 35 (Knee problems.  Often used with heding and the me…), UB 38 (Similar functions to the bladder points on the sa…) and UB 39 (Harmonize the triple warmer, damp heat conditions…) are nearby.

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