Swollen feet in late pregnancy may be caused by physiological reasons such as uterine enlargement or pathological reasons such as kidney disease, which need to be analyzed specifically. 1. Physiological causes: swollen feet occur in late pregnancy due to the enlargement of the uterus and the compression of the inferior vena cava, resulting in impaired venous return to the lower extremities. You can elevate your legs appropriately to increase blood return and relieve the symptoms of swollen feet. 2. Pathological causes: renal disease can cause sodium retention in the body, the main symptom is edema, nephrotic syndrome is often the first foot edema. Swollen feet in late pregnancy may also be related to other reasons, it is recommended to go to the regular hospital for relevant examinations to clarify the cause of the disease and treatment.