BL 40 Acupuncture Point

Bladder 40, or Urinary Bladder 40, Abbreviated as BL 40 or UB 40, Transliterated Weizhong in Chinese, Middle of the Crease in English.

BL 40 Acupuncture Point Location:

Midpoint of the transverse crease of the popliteal fossa, between the tendons muscle biceps femoris and muscle semitendinosus.

BL 40 Acupuncture Point Indications:

  • Lumbar pain, spasms and weakness of the lower extremities
  • Erysipelas, rash, general pruritus, furuncle, carbuncle on the back
  • Abdominal pain, vomiting, diarrhea
  • Enuresis, dysuria

BL 40 Acupuncture Point Benefits:

Clears Heat, resolves Dampness, benefits the lumbar area and knees, cools the Blood, clears Summer-Heat, activates the meridian, relieves pain.


He-Sea point of the Urinary Bladder
Command Point of the low back


BL 40 is an excellent point for any low back condition, acute or chronic. It is also known to help skin conditions. He-Sea points are where the qi of the meridian collects and goes deep into the body. He-sea points are known to indicated treat rebellious qi and diarrhea.