Aunt with blood clots may be caused by shedding of large endometrial lining, endometrial polyps, submucosal fibroids and so on. 1. Large endometrial detachment: During menstruation, if the large endometrial lining in the uterine cavity is detached and mixed with menstrual blood to be discharged out of the body, it may cause blood clots in the aunt. 2. endometrial polyps: endometrial polyps patients, menstruation, the lesion site of the endometrium irregular shedding discharged, it may cause aunt blood with blood clots. 3. Submucosal fibroids: when a female patient has submucosal fibroids, if the endometrium sheds unevenly during menstruation and mixes with the menstrual blood, it may lead to clots in the blood of the aunt. It is recommended to go to the hospital to check whether the blood clots in the aunt are pathologic factors.