Excerpted from Bensky:  Chinse Herbal Medicine Materia Medica, 3rd ed

• Regulates the qi, adjusts the middle, and relieves the diaphragm:  for Spleen or Stomach stagnant qi patterns with such symptoms as epigastric or abdominal distention, fullness, bloating, belching, and nausea and vomiting.  this herb promotes the movement of qi in general while specifically directing it downward.  It is therefore commonly used in treating many different types of nausea and vomiting.*
• Dries dampness and transforms phlegm:  an important herb for phlegm-damp coughs with a stifling sensation in the chest and/or diaphragm, and copious, viscous sputum.  Also used for damp turbidity obstructing the middle with a stifling sensation in the chest, abdominal distention, loss of appetite, fatigue, loose stools, and a thick, greasy tongue coating.  An important qi-level herb for both the Spleen and Lung channels, it is especially appropriate for disorders involving both channels.*
• Helps prevent stagnation:  used with tonifying herbs to prevent their cloying nature from causing stagnation.*