Women who have already had an ectopic pregnancy or have had previous tubal surgery are also at higher risk. A very rare cause of early bleeding is molar pregnancy . It results in the growth of abnormal tissue, rather than an embryo. It may require treatment with suction curettage or with drugs. The causes of bleeding in the second half of pregnancy are different from those in early pregnancy.
Common conditions causing minor bleeding include inflammation of or growths on the cervix .
Bleeding can also be serious and pose a threat to the health of the woman or the fetus. It may require treatment in a hospital. The two most common causes are placental abruption and placenta previa. Preterm labor can also cause vaginal bleeding. If the placenta becomes detached from the uterine wall before or during labor, vaginal bleeding may occur.