BL25 (Dà Cháng Shū, “Dà Cháng Shū”) is the Back-Shu point of the Bladder Meridian. It is located on the lower back, 1.5 cun lateral to the lower border of the spinous process of the fourth lumbar vertebra (L4). The classical texts locate this point below the sixteenth vertebra. It regulates the intestines, clears damp-heat, alleviates stagnation, strengthens the lumbar spine and legs, and treats conditions of dryness in the Large Intestine.
On the lower back, 1.5 cun lateral to the lower border of the spinous process of the fourth lumbar vertebra (L4). The classical texts locate this point below the sixteenth vertebra.
Perpendicular-oblique insertion towards the spine, 1.0 to 1.5 cun. Deep perpendicular insertion is not advised to avoid injuring the kidney.
Regulates the intestines, clears damp-heat, alleviates stagnation, strengthens the lumbar spine and legs, and treats conditions of dryness in the Large Intestine.
Abdominal distension, rumbling in the abdomen, gushing diarrhea with undigested food, dysentery, white dysentery, food not digesting, twisting pain in the lower abdomen, cutting pain around the navel, difficulty with urination and defecation, constipation, intestinal wind, abdominal fullness with rumbling, abdominal gas distension that refers to the spine, eating a lot but remaining thin (a condition called 'shí huì'), lumbar pain, spinal rigidity making it difficult to bend forward or backward, intestinal colic, intestinal abscess, 대변불금 (daebyeonbulgeum - fecal incontinence), intestinal hernia.
As the Back-Shu point of the Large Intestine, BL25 is a primary point for any intestinal disorder, effectively treating both diarrhea and constipation by regulating the organ's function. Its location on the lower back also makes it an essential local point for lumbar pain and stiffness, especially when the pain is accompanied by digestive complaints. According to Li Dong-yuan, it is the key point for treating conditions arising from dryness affecting the Large Intestine.
Classical text; the translation was prepared with AI and is not clinical advice.
《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 ↗
大腸腧 在十六椎下兩旁。 開脊中二寸。 （針三分灸三壯）治大小便難According to this text, BL25 lies on both sides below the sixteenth vertebra, 2 cun from the spine's centre; needle 3 fen, moxa 3 cones, and it records use for difficult urination and defecation.
《醫學入門》 Yīxué Rùmén — Introduction to Medicine, Li Chan, 1575 · 经穴起止 · Source: Wikisource ↗
大肠俞十六节外一寸半。 针三分，灸三壮。 主腰痛，肠鸣胀满，绕脐中痛，二便不利，或泄痢食不化，脊强腹肿According to this text, BL25 lies 1.5 cun lateral to the sixteenth vertebra; needle 3 fen, moxa 3 cones. It records use for low back pain, borborygmi and distension, pain around the navel, difficult urination and defecation, diarrhoea with undigested food, stiff spine and abdominal swelling.
《醫宗金鑑·刺灸心法要訣》 Yīzōng Jīnjiàn · Cìjiǔ Xīnfǎ Yàojué — Golden Mirror of Medicine: Essential Teachings on Acupuncture & Moxibustion, Wu Qian et al., 1742 · 卷七 · 背部主病針灸要穴歌 · Source: jicheng.tw ↗
大腸俞治腰脊疼，大小便難此可通，兼治泄瀉痢疾病，先補後瀉要分明The verse records that BL25 was used for pain of the lumbar spine and to open difficult urination and defecation, and also for diarrhoea and dysentery, stressing that tonifying should come first and draining after.
《千金翼方》 Qiānjīn Yìfāng — Supplement to the Thousand Gold Prescriptions, c. 682 · 卷26 · Source: Wikisource ↗
大腸中風者，臥而腸鳴不止，灸大腸俞百壯，服續命湯The text records that in large-intestine wind-stroke, with the patient lying down and unceasing borborygmi, BL25 was moxibusted with 100 cones and Xuming decoction given.
BL25 is one of 67 points on the Bladder Meridian. Nearby points:
BL25 (Dà Cháng Shū) is located on the lower back, 1.5 cun lateral to the lower border of the spinous process of the fourth lumbar vertebra (L4). The classical texts locate this point below the sixteenth vertebra.
BL25 regulates the intestines, clears damp-heat, alleviates stagnation, strengthens the lumbar spine and legs, and treats conditions of dryness in the Large Intestine. Common clinical indications include abdominal distension, rumbling in the abdomen, gushing diarrhea with undigested food, dysentery, white dysentery, food not digesting, twisting pain in the lower abdomen, cutting pain around the navel, difficulty with urination and defecation, constipation, intestinal wind, abdominal fullness with rumbling, abdominal gas distension that refers to the spine, eating a lot but remaining thin (a condition called 'shí huì'), lumbar pain, spinal rigidity making it difficult to bend forward or backward, intestinal colic, intestinal abscess, 대변불금 (daebyeonbulgeum - fecal incontinence), intestinal hernia.
Perpendicular-oblique insertion towards the spine, 1.0 to 1.5 cun. Deep perpendicular insertion is not advised to avoid injuring the kidney.
BL25 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).