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Blood stasis (also blood stagnation and blood stasis syndrome) (BS) is a concept in traditional Chinese medicine (TCM), described as a slowing or pooling of the blood due to a disruption of heart qi. Blood stasis is also described by practitioners of TCM in terms of yin deficiency, qi deficiency and qi stagnation. For non-practitioners of TCM it is sometimes explained in terms of hematological disorders such as hemorrhage, congestion, thrombosis or local ischemia, and in terms of tissue changes. TCM practitioners believe it is an important underlying pathology of many disease processes[1] despite the fact that objective, consistent methods for measuring the presence of blood stasis syndrome are not readily available.[2] Blood stasis is associated with justifications for acupuncture and herbal treatments.[3]