“He” means confluent. Weizhong is the He-sea point of the Urinary Bladder Meridian. The point is below Weizhong (BL40), being the place where the qi of the meridian reconverges. Hence the name Heyang (Confluent Yang).
Two cun directly below Weizhong (BL40), between the medial and lateral heads of the musculus gastrocnemius.
Profuse uterine bleeding.
Aching and soreness of the lower extremities.