The Lower Great Hollow — Xiajuxu (ST-39) is the Lower He-Sea point of the Small Intestine, a deep connector between the Stomach channel and the Small Intestine below. It regulates digestion in the lower belly, treats disorders of the lower limb, and bridges the gap between two great organ systems.
Contraindications
Xiajuxu (ST-39) is a safe and well-tolerated point. There are no special contraindications; use standard clean needling technique and stay within the recommended depth.
Name & story
The name 下巨虚 Xiajuxu means "Lower Great Hollow" — a companion to Shangjuxu ST-37, the "Upper Great Hollow". Together they frame a wide, open territory along the shin, and the "hollow" refers to the natural depression on the outer lower leg where both points are found. Lower and Upper, they mirror each other like two gates on the same road — one governing the Large Intestine above, and Xiajuxu guarding the Small Intestine below. The name quietly tells you something important: this is a deep, receptive point, an opening rather than a peak.
Point family & character
Xiajuxu (ST-39) sits on the Stomach Meridian (ST) but its most important identity is as the Lower He-Sea point of the Small Intestine channel (SI). In classical theory, the six Fu organs each have a Lower He-Sea point — a place on the leg where the organ's Qi "gathers and enters" the sea. For the Small Intestine, that meeting place is here, on the Stomach channel of the leg, making ST-39 the key point to directly influence the Small Intestine from below.
Five-element dynamics
The Stomach Meridian (ST) belongs to the Earth element, rich and abundant in Qi and Blood (Xue) — and Xiajuxu, sitting along that channel, shares that quality of fullness. The Small Intestine is a Yang organ whose job is to separate the pure from the impure: clear fluids and nourishing essences are sent upward, while turbid waste is passed down. When this sorting function fails — through Heat, Dampness, or Qi Stagnation — pain, diarrhoea, or dysentery follow. Xiajuxu, as the Lower He-Sea of the Small Intestine, directly steadies this separating function, helping the organ do its quiet, essential work.
Location
Find it on the outer lower leg: it lies 9 Cun below the tibiofemoral joint line, or 3 Cun below Shangjuxu ST-37. It sits about two finger-breadths lateral to the front ridge of the shin bone — one finger-breadth lateral to Tiaokou ST-38, which lies just beside it.
Anatomy & fascia
The point lies on the lower leg, in the region of the tibialis anterior muscle, lateral to the anterior crest of the tibia.
Needling
Insert the needle perpendicularly (straight in). The Qi sensation often travels down along the leg.
The golden tip
To support the lower digestive system or ease discomfort in the lower leg, locate ST-39 on the outer shin: about 9 Cun below the knee crease, two finger-breadths out from the front edge of the shin bone. Press firmly and steadily for 1–2 minutes on each leg, or gently warm the area with a heat pack. This is especially comforting when the belly feels cramped, heavy or unsteady, or when the legs feel tired and achy.
For education only — not medical advice. Consult a qualified practitioner.