I keep reading about “yin deficiency” and “Kidney deficiency”. Isn’t that a partial diagnosis? I know too if I am right that 4 needle acupuncture is only for excess/deficiency. Hum. Yin deficiency. OK does that involve a particular organ ? Would that be cold, wet ? What does “yin deficiency” entail? Can a professional help me here? Please let me know if I am not being clear enough. Kidney deficiency. Kidney deficiency of what ?