Exceptionally large menstrual clots may be associated with gynecological diseases such as uterine fibroids, adenomyosis, endometrial polyps, and so on, and may also be associated with blood system diseases. 1. Gynecological diseases: uterine fibroids, adenomyosis, endometrial polyps and other diseases will lead to an increase in the size of the uterine lining, affecting the uterine contraction, in which case the patient may experience particularly large clots, which are usually accompanied by prolonged menstrual periods. 2. Blood system diseases: such as coagulation disorders, thrombocythemia and other diseases may also occur in the case of large menstrual clots. If the patient has a particularly large menstrual blood clot, it is recommended to go to the hospital in time to clarify the cause, and then carry out standardized treatment, so as to avoid delaying the condition.