阴虚 is paired with
阳虚 (yang deficiency) as the two fundamental deficiency patterns in TCM.
阴 represents cooling/moistening substance; its depletion yields a 'false heat' pattern — hot palms and soles, night sweats, insomnia, red tongue with little coating. Standard tonics include
六味地黄丸 (Liu Wei Di Huang Wan), one of the most famous patent medicines in Chinese history.
