Andrew said: Good question! The debate here is what to treat, root or branch. The answer depends upon practitioner preference. What do you see as being predominant- the deficiency or the damp? Some practitioners peel away pathology like peeling an onion… treat the damp first then tonify the root. Others might say forget the damp and just tonify the spleen, eventually the damp will resolve. I would say most TCM style practitioners would treat both simultaneously (my preference). So, you might consider a formula with some spleen qi or yang tonifying herbs and some dampness moving/drying herbs.
Spleen deficiency and yin deficiency are not similar. I wonder if you are thinking of spleen deficiency and yin “excess”? However, TCM does not talk about yin excess. It is a bit of semantics, I know. Yin is a nourishing and healthy body substance. When it accumulates to a pathological level it is no longer considered yin. Instead, it turns into damp or phlegm which then obstructs. The goal is to understand what happened first. Two possibilities: 1. Slow, chronic organ or ming men decline then leads to substances not transforming properly and ends with damp/phlegm accumulation. 2. External dampness invades and if the damp lingers long enough, organ function begins to decline. If you are not sure, the short-cut is to treat both simultaneously and you will probably have a good treatment plan!