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Urinary Bladder Meridian (Toot Tai Yang) Points

UB-40 (Wei Zhong)


Chinese Name:

Weizhong 委中

English translation:

Supporting Middle


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


  • He-Sea point of the Urinary Bladder
  • Command Point of the low back


  • Vomiting and diarrhea, abdominal pain, low back pain.
  • Wei and Bi syndromes of lower limbs (Bi syndrome of knee, Bi syndrome of hip, paralysis of lower limbs).
  • Hemiplegia, sciatica, spasms of gastrocnemius, skin disorders, erysipelas, leprosy, loss of consciousness, tidal fever, night sweats, epistaxis.
  • Sore throat, throat disoders, aching among lower teeth, hair loss, torticollis, seizures, lower abdomen hard, tympanites, incontinence of urine, cystitis.


Clears Heat, resolves Dampness, benefits the lumbar area and knees, cools the Blood, clears Summer-Heat, activates the meridian, relieves pain.


UB 40 is an excellent point for any low back condition, acute or chronic. It is also known to help skin conditions. He-Sea points are where the qi of the meridian collects and goes deep into the body. He-sea points are known to indicated treat rebellious qi and diarrhea.


Perpendicular insertion 1.0 - 1.5 cun, or prick the popliteal vein with the three-edged needle to cause bleeding.

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