this is a form of lung atrophy (fèi wěi). although the symptoms are primarily related to the lungs, the condition is actually caused by heat from deficiency in the stomach, which rises in rebellion and scorches the lung yin. it may also be understood by reference to the theory of the five phases, wherein the ‘mother’ (stomach) transmits the problem to the ‘child’ (lungs).

the lungs are the most delicate of the yin organs and serve as a canopy for the trunk. they depend on the earth (spleen/stomach) for nourishment and for some of its fluids. if, over an extended period of time, the lungs do not receive proper nourishment or moisture, they shrivel up or ‘atrophy.’

the rebellious qi from the stomach prevents the lung qi from descending properly, and results in coughing and wheezing. the scorching of the lung yin causes shortness of breath and depletes the fluids. the depletion of the fluids leaves only saliva or a thick, viscous sputum that becomes lodged in the throat and causes a dry, uncomfortable sensation. the dry mouth, and the tongue and pulse signs, are classic indications of heat from deficiency leading to internal dryness.