what cause premature labor
1 This could lead to premature rupture of the membranes and preterm labor. 2  Problems with the placenta , such as placenta previa or placental separation, may cause preterm labor. 3  Injury to your abdomen or uterus may also cause some cases of preterm labor.  You are pregnant with 2 or more babies.
1 A large uterus or a short cervix can cause you to go into labor early. 2  A chronic illness , such as high blood pressure, diabetes, or obesity, can cause early labor.  An infection , such as a urinary tract infection or vaginal infection, can weaken the membranes (linings) of the amniotic sac around your baby.