Qi and Yin deficiency (QYD)

Qi and Yin deficiency is a pathological syndrome (Zheng) within Traditional Chinese Medicine (TCM) characterized by the concurrent depletion of vital energy (Qi) and body fluids or essence (Yin). It is not a singular molecular target, such as a receptor or enzyme, but rather a holistic clinical classification used to describe a state of multi-system physiological imbalance often observed in chronic illnesses (Wang et al., 2014, Evidence-Based Complementary and Alternative Medicine). Clinically, it manifests as fatigue, spontaneous sweating, dry mouth, and a weak, rapid pulse, frequently associated with conditions like Type 2 diabetes and chronic heart failure (Zhu et al., 2019, Journal of Diabetes Research). Modern pharmacological research suggests that this syndrome correlates with dysregulation in energy metabolism, oxidative stress, and immune dysfunction. Therapeutic strategies focus on 'tonifying' and 'nourishing' through polyherbal formulas like Shengmai San, which have been shown to influence mitochondrial efficiency and inflammatory pathways (Liu et al., 2018, Frontiers in Pharmacology). Because it represents a systemic state rather than a specific protein, it is considered an 'incorrect' entry if searched for as a conventional drug target, though it remains a significant focus for integrative medicine and systems biology research.

Other names

Qi-Yin deficiency syndromeDeficiency of both Qi and YinDual deficiency of Qi and YinQi-Yin Liang Xu

In Traditional Chinese Medicine, the mechanism is to tonify Qi (restore energy/function) and nourish Yin (replenish fluids/substance). Molecularly, treatments for this syndrome often modulate mitochondrial function, reduce oxidative stress, and regulate the hypothalamic-pituitary-adrenal (HPA) axis.