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Blood stasis (also blood stagnation) is an important underlying pathology of many disease processes according to traditional Chinese medicine (TCM). Described in TCM theory as a slowing or pooling of the blood due to a disruption of heart qi, it is often understood in terms of hematological disorders such as hemorrhage, congestion, thrombosis or local ischemia (microclots), and in terms of tissue changes. Pharmacologist Li Lianda received a National Science and Technology Progress Award for his work on the scientific basis of blood stasis.
In TCM, the spleen and kidneys govern the movement and transformation of qi and fluid and these organs cooperate with each other to participate in the metabolism of water. A functional disorder of the spleen or kidneys would lead to qi stagnation and blood stasis.