Baihuanshu BL-30

Chinese: 白环俞

Pinyin: Bái Huán Shū


At the level of the 4th posterior sacral foramen, 1.5 cun lateral to the posterior midline. 

How to locate

First identify the Tuffier's line which connects the highest points of the iliac crest. The spinous process  of the 4th lumber vertebra (L4) mostly falls on this line. 

Then palpate in an inferior direction, passing  L5, and reach the most superior 1st sacral foramen. Palpate further down for three sacral foramens and locate the 4th one in a depression.

Locate Baihuanshu BL-30 at the same level of the 4th sacral foramen and 1.5 cun lateral to the posterior midline. 

Points located between Fufen BL-41 and Zhibian BL-54 are in the lateral branch of the Bladder Channel, while these between Fengmen BL-12 and Baihuanshu BL-30 are in the medial branch.

Main actions

  1. Benefits the anus
  2. Strengthens the lower back and legs
  3. Regulates menstruation
  4. Stops seminal emissions or leukorrhea


Vertically 0.5–1.5 cun. 

Commentary for Baihuanshu BL-30

The point's name BaiHuan (White Ring) refers to 'Anus', because BL-30 is mostly used for anus disorders, such as haemorrhoids, prolapse and spasm of anus and incontinence of stools.  

It also strengthens the lower back and legs, working as a local point to invigorate Qi so as to stop pain of the lumbar region, sacrum, hip and coccyx. 

Finally it regulates the Uterus and genito-urinary system by strengthening Qi there. Therefore BL-30 treats various menstruation problems, seminal emissions or leukorrhea.