Pinellia Rhizome

Herb actions

Drying Dampness and transforming Phlegm is at the center of Ban Xia's actions, addressing cough with copious, easily expectorated sputum and the digestive sluggishness that comes from Damp-Phlegm. Ban Xia descends rebellious Stomach qi and stops vomiting, calming nausea that arises when Phlegm-Dampness in the Stomach pushes qi upward instead of allowing it to move down as it should. It dissipates nodules and reduces distention, easing pressure and fullness in the chest and epigastrium and breaking up Phlegm that clumps and accumulates through the body. Applied topically as a powder, it also reduces swelling in sores and skin lesions.

Flavor and nature

Acrid flavor gives Ban Xia its capacity to move and disperses accumulation. Its Warm nature adds heat to that movement, drying the Dampness that collects into Phlegm. Phlegm-Dampness in the Spleen and Stomach is one of the main patterns Ban Xia addresses, arising when the Spleen fails to transform fluids properly and thin mucus or thick sputum accumulates in its place. An acrid flavor is normally associated with outward or upward movement, yet Ban Xia's action moves downward, descending rebellious Stomach qi. Ban Xia helps to restore the Spleen's transformation of fluids and the Stomach's downward movement, drying and dispersing the Phlegm-Dampness in the abdomen.

How Daodi uses it

Formulas addressing Phlegm-Dampness, whether it shows up as nausea, a heavy sensation in the epigastrium, or a lump-in-the-throat sensation that comes and goes with emotional strain, call for Ban Xia. It works alongside qi-moving herbs to clear the Phlegm that has settled into the body. Its drying, descending action clears accumulated Dampness from the Middle Jiao so that other herbs in the formula can take effect.

Herb pairings

• Chen Pi-Chen Pi's qi-moving, drying action supports Ban Xia's transformation of Phlegm, addressing both the sputum and the Spleen qi stagnation that produces it.

• Fu Ling-Fu Ling strengthens the Spleen and leaches Dampness at its source, while Ban Xia dries and transforms Phlegm that has already formed.

• Sheng Jiang-Sheng Jiang warms the Stomach and awakens the Spleen to harmonize digestion, working alongside Ban Xia's drying, descending action to settle nausea more completely.

• Hou Po-Hou Po moves qi and relieves fullness in the chest and abdomen, pairing with Ban Xia to open the combined Phlegm and qi stagnation behind a lump-in-the-throat sensation.

• Zi Su Ye-Zi Su Ye disperses constrained qi in the chest and diaphragm, complementing Ban Xia's drying action in patterns where Phlegm and stagnant qi obstruct together.