BL30 (Bái Huán Shū, “White Ring Shu”) is an acupuncture point on the Bladder Meridian. It is located in the sacral region, 1.5 cun lateral to the midline, at the level of the fourth posterior sacral foramen, which corresponds to the space below the 21st vertebra in classical counting. It strengthens the lumbar spine and knees, regulates the lower jiao, dispels wind and cold, resolves dampness, and treats disorders of urination, defecation, and the reproductive system.
In the sacral region, 1.5 cun lateral to the midline, at the level of the fourth posterior sacral foramen, which corresponds to the space below the 21st vertebra in classical counting.
Perpendicular or oblique insertion towards the midline, 1.0 to 1.5 cun. Care should be taken to avoid deep insertion into the sacral foramen.
Strengthens the lumbar spine and knees, regulates the lower jiao, dispels wind and cold, resolves dampness, and treats disorders of urination, defecation, and the reproductive system.
Lumbosacral pain, hernia pain, difficult urination and defecation, numbness in the hands and feet, hip pain, leg and knee problems, malaria with heat, cold pain in the lumbar spine, inability to lie down for long periods, vacuity taxation wind, restricted movement of the back, muscle spasms and contractures, vacuity heat and blockage, lumbosacral spasmodic pain, inability to bend forward or backward, difficulty sitting up, yellow urine, heavy sensation and inability to lift the lumbar and sacral region, red and yellow urine, seminal emission from dream, nocturnal emission due to fright, white vaginal discharge.
BL30 is a key local point for disorders of the lumbosacral region, pelvis, and genitourinary system. Its indications for pain, stiffness, and weakness in the lower back and hips make it essential for treating sciatica and sacroiliac joint dysfunction. Furthermore, its classical use for hernia, seminal emission, and vaginal discharge highlights its role in regulating the lower jiao and addressing reproductive and urinary issues rooted in local stagnation or deficiency.
Classical text; the translation was prepared with AI and is not clinical advice.
《黃帝明堂灸經》 Huángdì Míngtáng Jiǔjīng — The Yellow Emperor's Bright Hall Moxibustion Classic, Tang · 卷中 · 揹人形第六 · Source: jicheng.tw ↗
白環俞 二穴，在二十一椎下兩旁各一寸半，灸三壯。 主腰脊急強不能俯仰，起坐難，手足不仁，小便黃，腰尻重不舉也The text records that BL30, 1.5 cun on each side below the twenty-first vertebra, was moxibusted with 3 cones for stiffness of the lumbar spine preventing bending, difficulty rising from sitting, numbness of hands and feet, yellow urine and heaviness of the lower back and buttocks.
《十四經發揮》 Shísì Jīng Fāhuī — Exposition of the Fourteen Channels, 1341 · Source: Wikisource ↗
白環俞：在第二十一椎下，伏而取之It is located below the twenty-first vertebra and is found with the patient lying prone, according to this text.
《針灸逢源》 Zhēnjiǔ Féngyuán — Sources of Acupuncture & Moxibustion, Li Xuechuan, 1815 · 卷四 · 經穴考正 · 足太陽膀胱經穴考 · Source: jicheng.tw ↗
白環腧 在二十一椎下兩旁開脊中二寸。 （針五分禁灸）治腰脊痛不得臥According to this text, BL30 lies on both sides below the twenty-first vertebra, 2 cun from the spine's centre; it is needled 5 fen, moxibustion is forbidden, and it was used for lumbar and spinal pain preventing lying down.
BL30 is one of 67 points on the Bladder Meridian. Nearby points:
BL30 (Bái Huán Shū) is located in the sacral region, 1.5 cun lateral to the midline, at the level of the fourth posterior sacral foramen, which corresponds to the space below the 21st vertebra in classical counting.
BL30 strengthens the lumbar spine and knees, regulates the lower jiao, dispels wind and cold, resolves dampness, and treats disorders of urination, defecation, and the reproductive system. Common clinical indications include lumbosacral pain, hernia pain, difficult urination and defecation, numbness in the hands and feet, hip pain, leg and knee problems, malaria with heat, cold pain in the lumbar spine, inability to lie down for long periods, vacuity taxation wind, restricted movement of the back, muscle spasms and contractures, vacuity heat and blockage, lumbosacral spasmodic pain, inability to bend forward or backward, difficulty sitting up, yellow urine, heavy sensation and inability to lift the lumbar and sacral region, red and yellow urine, seminal emission from dream, nocturnal emission due to fright, white vaginal discharge.
Perpendicular or oblique insertion towards the midline, 1.0 to 1.5 cun. Care should be taken to avoid deep insertion into the sacral foramen. Caution: Several classical sources, including the Jia Yi Jing and Qian Jin Yao Fang, explicitly forbid moxibustion on this point. The Zi Sheng Jing adds that after needling, one should avoid sexual activity and heavy lifting.
BL30 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).