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Alternate names: 大冲 dà chōng, Large Surge; 太冲 tài chōng, Great Thoroughfare; 足厥阴之源 zú jué yīn zhī yuán, Source of Foot Reverting Yin

Channel: LR, Foot Reverting Yīn (jué yīn) Liver Channel

Modern location: An acupoint located on the dorsal aspect of the foot, in the space between the first and second metatarsal bones, slightly distal to their tarsometatarsal articulations.

Classic location: One and a half to two cùn below the base of the great toe, in the depression where the pulsating vessel can be felt. (Zhēn Jiǔ Dà Chéng)

Local anatomy: The dorsal venous network of the foot, and the first dorsal metatarsal artery. The branch of the deep peroneal nerve.

Action: Extinguishes liver fire and clears liver yáng; discharges damp-heat in the lower burner; soothes the liver; rectifies qì; courses the network vessels and quickens the blood.

Modern indications: Headache; dizzy vision; painful red swollen eyes; deviated mouth; rib-side; enuresis; mounting qì (shàn qì, inguinal hernia); flooding and spotting; menstrual irregularities; epilepsy; retching counterflow; child fright wind; wilting-impediment (wěi bì) of the lower limbs.

Classic indications: Genital pain; retracted genitals; saber and pearl-string lumps; fright wind; food diarrhea; painful swollen throat; dryness of the upper esophageal opening; lateral knee pain; limp aching lower legs; painful red eyes; lumbar pain; smaller abdominal fullness; pain in the umbilical region; cold feet; difficult defecation; jaundice; thunderous rumbling in the intestines; retching counterflow with no food intake; strangury (lìn); vacuity taxation water swelling; profuse, incessant postpartum sweating; amenorrhea.

Needle stimulus: Needling: 0.3‒0.5 cùn perpendicular insertion. Moxa: 3 cones; pole 3‒7 min.

Needle sensation: Localized numbness and distension.

Point groups: Stream (shù) (earth) and source point (yuán xué); one of Mǎ Dān-Yáng's twelve heavenly star points.

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