Swollen feet in the seventh month of pregnancy may be normal, such as those caused by obstruction of venous return in the lower extremities, or abnormal, such as gestational hypertension and kidney disease. 1. Obstruction of venous return in the lower limbs: seven months of pregnancy, fetal growth and development is relatively fast, the uterus is enlarged more obviously, the enlarged uterus on the surrounding tissues and the blood system to produce compression, which will trigger circulatory disorders, obstruction of venous return in the lower limbs, the accumulation of blood and fluids in the lower limbs of the lowest parts of the body, there will be a swollen feet performance, which is generally a physiological phenomenon. 2. Gestational hypertension: gestational hypertension during pregnancy, vasospasm of blood vessels after the increase in blood pressure will lead to a large amount of protein loss, thus causing swelling of the feet, swelling will not be limited to the ankles, it will spread upward to the calves, thighs, perineum and other parts of the body. 3. Kidney disease: seven months pregnant with nephritis, nephrotic syndrome, renal failure and other diseases, the ability of the kidneys to excrete water decreased, and activation of the renin-angiotensin-aldosterone system resulting in water and sodium retention, there will also be swollen feet. There are more reasons for swollen feet in the seventh month of pregnancy, and it is recommended to consult a doctor for timely examination in serious cases.