A taxation pattern indicates that yang and yin are both deficient. Yang fails to warm, move, and transform, while yin fails to nourish, anchor, contain, and moisten the yang.
In chapter 6 there are three different patterns and formulas described.
Each contains abdominal urgency or tightness as one of the key symptoms. Yet each pattern is slightly different.
Chapter 6 Line 13 For deficiency taxation with abdominal urgency, palpitations, nosebleed, abdominal pain, dream emission, soreness and pain of the four limbs, vexing heat of the extremities, and dryness of the mouth and throat, xiao jian zhong tang is indicated.
Xiao jian zhong tang treats a pattern where the yin fails to contain the yang which becomes excessive and starts to float up and out.
The weak yang fails to control the heart yang which leads to palpitations. The rising heat causes nose bleed, vexing heat in the extremities. The rising heat damages the yin and fluids even more. The yang fails to transform the yin fluids which causes dryness of the mouth and throat. The demise of yin and fluids causes dryness, which leads to abdominal urgency and pain, soreness and pain of the extremities, and dryness of the mouth and throat.
Chapter 6 Line 14 For deficiency taxation, abdominal urgency, and the various kinds of insufficiency, huang qi jian zhong tang is indicated.
By looking at the nature of huang qi we can understand this formula. Huang qi is a both a yang and yin herb. It is yang in that it raises the tai yin spleen clear qi to the 100 vessels. Which is a way of saying it tonifies and nourishes the whole body. It is also a yin herb in that it nourishes the clear qi needed to nourish the whole body.
Chapter 6 Line 15 For deficiency taxation manifesting with lumbar pain, lesser abdominal hypertonicity, and inhibited urination, ba wei shen qi wan is indicated.
In this line urination is mentioned and not in the other lines giving the impression that this is a key symptom. Weak yang is failing to transform yin fluids and cold has closed the bladder. Excessive yin dryness is causing back pain and tightness in the abdomen.
Shen qi wan also treats excessive urination due to cold failing to transform fluid which drop out the lower burner as excessive urination.
Chapter 13 Line 3 For men with dispersion-thirst yet with profuse urination who drink one dou of water and urinate one dou, shen qi wan is indicated.