What Causes Early Labor?

The causes of preterm labor may be because of the mother, the fetus, or the placenta. Maternal factors that may cause preterm labor include pregnancy-induced hypertension, diabetes, heart or renal disease, an incompetent cervix, premature rupture of the membranes, and maternal infection. Fetal factors include fetal infection, multiple pregnancy, and an excessive amount of amniotic fluid. Problems with the placenta include placenta previa, a placenta that has formed in the lower uterine segment, or abruptio placenta, the premature separation from the wall of the uterus.