Swelling of the feet is a common clinical symptom after pregnancy, but generally, foot swelling is not directly related to preterm birth. However, sometimes, if pathological factors cause foot swelling, it may lead to preterm birth.

The most common cause of foot swelling during pregnancy is the increased size of the uterus compressing the veins and arteries in the pelvis, causing obstruction of venous return, which leads to swelling of the feet. However, this is a physiological change and does not cause preterm birth.

Pathological factors, such as hypertension during pregnancy or renal diseases during pregnancy, might cause generalized edema. If the condition is severe, medical intervention for medically induced preterm birth may be required. However, it is the primary disease that causes preterm birth, not the swelling of the feet.