The main symptoms of blood stasis constitution include darker tongue, rough skin and menstrual cramps. Tongue: People with blood stasis usually have petechiae on the tongue, darker tongue, more tortuous veins under the tongue and black color performance. Skin: People with blood stasis have rough skin with grayish color, lips and nails with purple color, dark facial skin and purple spots under the skin. Dysmenorrhea: The basic pathology of dysmenorrhea caused by blood stasis is stagnation of Chong Ren, poor circulation of qi and blood, obstruction of menstrual blood flow in the uterus, and pain when there is no circulation. Clinical symptoms include severe pain in the abdomen before or during menstruation, refusal to press on the painful area, dark purple blood clots, reduction of pain after the clots, dark purple tongue or petechiae, and sunken stringy or astringent pulse. If the above symptoms occur, it is recommended to go to a regular hospital in time and be treated by a Chinese medicine practitioner.