Plum Pit Qi (mei he qi) was first described 1,700 years ago in Essentials from the Golden Cabinet (Jin gui yao lue) by Zhang Zhong-Jing:
Subsequent texts elaborated on the condition and gave it the name ‘Plum Pit Qi’. It is basically a feeling of something stuck in the throat that can neither be spit out nor swallowed, accompanied by a stifling sensation in the chest, and sometimes coughing. Clinically the patient may complain of phlegm lodged in the throat that she cannot cough out. Emotionally, this condition may result when a person is trapped in life circumstances that she can not stomach or swallow. Needless to say, this can affect both men and women.
The ingredients in the master formula Pinellia and Magnolia Bark Decoction (ban xia hou po tang) are: ban xia Pinelliae, hou po Magnoliae, fu ling Poriae, sheng jiang Zingiberis (raw ginger), and zi su ye Perillae.