Syndromes summarize the whole reaction condition about pathological and physiological changes at a certain stage of disease. A complete diagnosis of syndrome usually includes two parts

the element of disease location and the element of disease nature. The diagnostic basis of the syndrome element is a constituent part of a group of symptoms

namely clinical features of symptoms. By establishing database about pathogenesises of Chinese medical symptoms

through analysing and selecting

the researchers found clinical features of specific symptoms of blood stasis including（ menstruation and lochia） blood clots

（ complexion

lip

tongue nature

nail bed

menstruation and lochia）dark purple

（ skin and tongue nature） ecchymosis

（ abdomen and forehead） prominent veins

（ skin） red collaterals like gossamer

（ head

chest

flank

gastral cavity and abdomen） stabbing pain

（ head and chest） fixed pain

and（ pain in chest

flank

gastral cavity and abdomen） exacerbation at night. In clinical practice

any one of clinical features of above 8 symptoms can directly identify the element of disease nature about blood stasis.