A uterine hemorrhage is bleeding from the uterus. Menstruation, commonly called periods, are natural and cyclical uterine hemorrhages from the hormonal regulation of the female reproductive system . In case of excessive menstrual bleeding in quantity or duration, it is called menorrhagia, which may be responsible for anemia or iron deficiency. Uterine bleeding may also be possible outside the menstrual period: this is called breakthrough bleeding, which is caused by uterine tumors such as polyps or fibroids, or bleeding disorders. Uterine bleeding is common after childbirth, miscarriage, or abortion. A hemorrhage occurring in pregnant women may be indicative of a problem during pregnancy and requires emergency consultation, especially in late pregnancy. Also after childbirth, a postpartum hemorrhage may occur.