The causes of swollen feet in late pregnancy include obstruction of venous return, low-protein, high-salt diet, and high blood pressure during pregnancy, etc. It is recommended to reduce walking appropriately. 1. Obstructed venous return: this is the main cause of swollen feet in late pregnancy. As the uterus gradually gets bigger during pregnancy, it compresses the veins from the pelvis to the lower limbs, resulting in obstruction of blood flow to the lower limbs, which leads to swelling of the lower limbs in pregnant women. In this case, it is recommended to reduce walking appropriately. 2. Low-protein, high-salt diet: pregnant women in late pregnancy, if the long-term low-protein, high-salt diet, can also cause swelling of the feet, when the body’s intake of protein content is relatively low, the colloid osmotic pressure of the capillaries will also be reduced, and therefore prone to the phenomenon of oedema, it is recommended that pregnant women walk less, so as not to exacerbate the symptoms of swelling of the feet. 3. Hypertension during pregnancy: due to systemic vasospasm, the endothelium of the capillaries is destroyed, which leads to increased osmotic pressure of the blood vessels, and therefore edema and elevated blood pressure. It is recommended to walk as little as possible, so as not to raise blood pressure after exertion, which is not conducive to the relief of swollen feet. It is not recommended to stay in bed for a long period of time when swollen feet occur during pregnancy. Walking in moderation is good for maintaining the health of the pregnancy, and it can also prevent the fetus from gaining weight too fast. If you have swollen feet during pregnancy and can’t get relief from moderate walking, it is recommended that you consult a doctor, under the guidance of the doctor, complete the relevant examinations, identify the cause and treat the symptoms.