If a woman is pregnant and she has regular contractions and the cervix dilates before her 37th week of pregnancy, she is said to be in preterm labor. Preterm labor is usually a spontaneous event in which the body starts the process. Occasionally a caregiver (doctor, midwife) will initiate preterm labor in order to deliver the baby early if there is a pregnancy complication that puts the baby or mother at risk.
Spontaneous preterm labor can be caused by cervix complications, by an abnormal placenta, a genital tract infection, by bacteria that causes the amniotic sac to become weak leading to premature rupture of the bags, or when chronic illness of the mom-to-be threatens the pregnancy. Chronic illnesses can also be at fault, such as severe asthma, diabetes, or sickle cell anemia.
Preterm Labor Risk Factors