Here are some brief notes about Yin Deficiency from my (co-written) book: Fundamentals of Chinese Medicine (PMPH 2015)Screen Shot 2015-08-16 at 10.37.19 AM

Yin deficiency heat involves the appearance of more (predominant) heat even when there is no increase in the actual amount of heat in the body. The relative appearance of more heat is due to the insufficiency of yin qi with a subsequent failure to restrain yang qi. Again, this is important in treatment, because strongly clearing heat from the body can easily damage yin further and thus aggravate the condition. Therefore, the main treatment principle here is to supplement yin while also gently eliminating

heat.