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Ma Dan Yang was a practitioner of Daoism in the 12th century. As a young man he developed great skill in acupuncture and moxibustion (Zhen Jiu 针灸). He left behind an ode to 12 miraculous acu-points, today known as Ma Dan Yang Acupuncture. If you want to learn a few acupuncture points that produce consistent results in treating a variety of illnesses, learn these! This article presents Ma Dan Yang’s ode to the fifth acu-point, Weizhong (BL 40) .
委中 Weizhong “Middle Bend” BL-40
Weizhong is located in the center of the transverse crease of the flexed knee, between the veins. For Yao (Lumbus) pain, inability to raise up and a deep, heavy pulling sensation in the spine. Sore, aching sinews which do not extend. Wind-Bi which returns irregularly, difficulty in bending and extending the knee. When the needle enters, there is relief. 委中曲(瞅)里。横纹脉中央。腰痛不能举。沉沉引脊梁。 酸痛筋莫展。风痹复无常。膝头难伸屈。针入即安康。 Notes: The Weizhong (BL 40) acu-point especially cures Yao (lumbar/waist), back, leg and knee problems. 承注:委中一穴,专治腰背腿膝之疾。
Weizhong “Middle Bend” BL-40
- Low back pain and inability to lift or straighten (bleed)
- Ache and pain of the sinews and joints
- Wind-Bi (rheumatic type pains which comes and goes)
- Difficult to stretch and bend knee
Actions:
- Benefits the Lumbar Area and Knees
- Activates the Channel – Alleviates Pain
- Cools the Blood
- Clears Summer Heat; Stops Bleeding & Diarrhea
- Benefits the Bladder
Other Modern Indications:
- Skin Conditions, Eczema, Toxins etc
- Distension or Pain in the Bladder;
- Difficult , Dark Urination
- Hemorrhoids (w/ BL57) – can bleed
- Pain Along the Channel
- Ceaseless Nosebleed
- Knee Pain
- Axillary Swelling; Pain in back of Shoulder or Scapula

Wei Zhong is located in the center of the transverse crease behind the knee when it is flexed.