Katsumada Galangal Seed Classic Formulas … Natural Herb Library

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Dries dampness and awakens the Spleen ... Cao Dou Kou is used for a heavy, obstructed middle burner with poor appetite, loose stool, and greasy damp stagnation.
Moves Qi and relieves fullness ... it helps when abdominal distension, epigastric oppression, and stagnant dampness create a blocked, swollen feeling.
Warms the middle and stops nausea or vomiting ... the aromatic seed is chosen when cold-damp digestive upset rises upward instead of descending normally.

Digestive damp-obstruction combinations with Hou Po, Chen Pi, and Mu Xiang ... classic aromatic strategy for fullness, nausea, and stagnant middle-burner Qi.
Cold-damp vomiting pairings with Gan Jiang and Ban Xia ... used when the Stomach is cold, heavy, and prone to retching.
Loose-stool and poor-appetite combinations with Bai Zhu or Cang Zhu ... traditional approach when dampness and weak transformation coexist.

TCM teaching describes Cao Dou Kou as pungent and warm, entering the Spleen and Stomach to dry dampness, move Qi, warm the middle, and stop vomiting.
Later materia medica discussions separate Cao Dou Kou more clearly from other cardamom-like aromatics, even though older texts sometimes used overlapping names.