BL34 (Xialiao, “Lower Crevice”) is an acupuncture point on the Bladder Meridian. It is located in the sacral region, over the fourth posterior sacral foramen, medial to BL30 (Baihuanshu). It regulates the lower jiao, benefits urination and defecation, and strengthens the lower back.
In the sacral region, over the fourth posterior sacral foramen, medial to BL30 (Baihuanshu).
Perpendicular insertion 1.0 to 1.5 cun into the fourth sacral foramen.
Regulates the lower jiao, benefits urination and defecation, and strengthens the lower back.
Lower abdominal pain, borborygmus, diarrhoea, constipation, blood in the stool, difficult urination, leucorrhoea, lumbosacral pain.
A local point for disorders of the lower jiao (bowel, bladder and genital region) and for sacral pain; often used together with the other sacral foramina points.
Classical text; the translation was prepared with AI and is not clinical advice.
《針方六集》 Zhēnfāng Liùjí — Six Collections on Needling, Wu Kun, 1618 · 卷之五·紛署集 · 背自第一椎兩旁夾脊各一寸五分下至節凡四十四穴第八 · Source: jicheng.tw ↗
下窌二穴，主腰痛不能轉側，大小便不利，寒濕內傷，腸鳴注泄，便血，婦人漏下蒼汁，陰中痛引小腹The text records that BL34 was used for low back pain preventing turning, difficult urination and defecation, internal damage from cold-damp, borborygmi with watery diarrhoea, blood in the stool, and in women a dripping greenish discharge and genital pain pulling on the lower abdomen.
《醫學綱目·刺灸》 Yīxué Gāngmù · Cìjiǔ — Outline of Medicine: Needling and Moxibustion, Lou Ying, 1565 · 卷之八·陰陽臟腑部 · 穴法下 · Source: jicheng.tw ↗
下髎二穴，在第四空夾脊陷中，足太陰厥陰少陽所結之會。 針入二分，留十呼，灸三壯It is located in the fourth foramen beside the spine, according to this text, where the foot taiyin, jueyin and shaoyang bind together; BL34 is needled 2 fen, retained 10 breaths, with 3 moxa cones.
《普濟方·針灸門》 Pǔjì Fāng · Zhēnjiǔ Mén — Formulas for Universal Relief: Acupuncture & Moxibustion Section, Zhu Su, 1406 · 卷四百十三 · 針灸門 · 膀胱 · Source: jicheng.tw ↗
下髎（在第四空俠脊陷者中。 灸五壯。 主腰痛引少腹。 女子下蒼汁不禁The text records that BL34, in the depression of the fourth foramen beside the spine, was moxibusted with 5 cones for low back pain radiating to the lower abdomen and, in women, uncontrollable greenish discharge.
BL34 is one of 67 points on the Bladder Meridian. Nearby points:
BL34 (Xialiao) is located in the sacral region, over the fourth posterior sacral foramen, medial to BL30 (Baihuanshu).
BL34 regulates the lower jiao, benefits urination and defecation, and strengthens the lower back. Common clinical indications include lower abdominal pain, borborygmus, diarrhoea, constipation, blood in the stool, difficult urination, leucorrhoea, lumbosacral pain.
Perpendicular insertion 1.0 to 1.5 cun into the fourth sacral foramen. Caution: Traditionally avoided or used with caution in PREGNANCY (strong qi/blood-moving or labour-promoting action).
BL34 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).