Bupleurum Root

Herb actions

Chai Hu's classic role in Shao Yang disorders, the stage where a pathogen is trapped between the body's surface and its interior, is harmonizing the exterior and interior. It resolves the alternating chills and fever, dizziness, ringing in the ears, flank pain, irritability, and vomiting that often occur together with this pattern. It spreads Liver qi and relieves stagnation, addressing dizziness, chest and flank pain, emotional instability, and an irregular menstrual cycle, along with epigastric and flank pain, abdominal bloating, and nausea when the Liver and Spleen fall out of harmony. It raises sinking qi, restoring the Stomach and Gallbladder's clear qi, the light, upward-moving qi that nourishes the head and senses, to its normal place. Qi collapse happens when qi loses the strength to hold that upward movement, or to hold organs and fluids in position, allowing bleeding, discharge, or exhaustion to develop. It also disperses Wind-Heat, easing the Phlegm and congestion that can accompany a Wind-Heat pattern.

Flavor and nature

Chai Hu's bitter flavor gives it a draining, descending directionality, clearing Heat and settling alternating fever and chills characteristic of Shao Yang illness. Its cool nature works alongside the bitter flavor, tempering the Heat that's created from qi stagnation. A secondary acrid flavor adds movement, dispersing stagnation and pushing it back out toward the body's exterior, which is how Chai Hu resolves a pattern caught between exterior and interior and eases the chest and flank pain of Liver qi stagnation. When that stagnation resolves, clear yang is able to rise.

How Daodi uses it

Liver qi stagnation is the pattern Chai Hu addresses most often in our formulas, particularly when a patient's mood shifts alongside her menstrual cycle, breast distention appears before bleeding starts, or a stifling sensation in the chest builds under stress. It acts as the primary qi mover in a formula, typically paired with Blood-nourishing herbs.

Herb pairings

• Bai Shao-Bai Shao nourishes Liver Blood and softens the Liver, moderating the dispersing pull of Chai Hu's bitter and acrid flavors so that spreading Liver qi doesn't further deplete Blood.

• Dang Gui-Dang Gui nourishes and moves Blood, harmonizing an irregular menstrual cycle that develops when Liver qi stagnation and Blood deficiency occur together.

• Bai Zhu-Bai Zhu tonifies Spleen qi, supporting the Spleen when Liver qi stagnation crosses over and disrupts digestion.

• Bo He-Bo He's light, dispersing quality extends Chai Hu's qi-spreading action toward the chest and flanks, easing the emotional constraint that comes with Liver Blood stagnation.

• Xiang Fu-Xiang Fu moves Liver qi directly, reinforcing Chai Hu's own qi-spreading action wherever stagnation runs deeper than Chai Hu alone resolves.