Is edema due to kidney yin deficiency or kidney yang deficiency?

The syndrome types of edema are complicated, which are clinically divided into yang water and yin water. The clear water content is (1) feng shui flooding. (2) Water wet impregnation. (3) Damp-heat stagnation can be divided into three categories. Yin and water are divided into (1) spleen-yang deficiency. (2) Kidney-yang decreased. There is also yang deficiency that can not be cured after a long illness, and there is also a syndrome of yin deficiency, which has become deficiency of both yin and yang.