Menstruation coming out with a lump of blood clots may be a normal condition, or it may be caused by uterine fibroids, endometrial polyps and other diseases. 1. Normal condition: If women are emotionally stressed, overworked or over-exercised during menstruation, the hormones in the body may not be stable, which may lead to the shedding of the uterine lining or an increase in the amount of menstruation, etc., and the situation of menstruation with a lump of blood may occur. 2. Uterine fibroids: uterine fibroids may also cause an increase in menstrual flow, so a lump of blood clots during menstruation may also be related to uterine fibroids. 3. Endometrial polyps: mainly manifested as increased menstrual flow, bleeding between periods, prolonged menstrual period, etc., so the phenomenon of clots may also occur. As you can see, a pile of blood clots out of menstruation may be normal or abnormal, women also need to pay more attention to menstruation with or without other changes, or other symptoms. If there is a change, you should consult a doctor and follow the doctor’s instructions to identify the cause of the disease and then targeted treatment.