Swollen feet in the fourth month of pregnancy is considered to be caused by compression of the inferior vena cava and obstruction of reflux, or it may be hypertensive disorders in pregnancy.
1. Compression of the inferior vena cava: In the fourth month of pregnancy, the fetus grows rapidly and the uterus enlarges significantly, leading to compression of the inferior vena cava and obstruction of venous return at the distal end, resulting in swollen feet and legs.
2. Hypertensive disorders during pregnancy: Increased blood pressure in the fourth month of pregnancy leads to the function of the kidneys being affected, the renal blood flow and glomerular filtration rate decreases, resulting in swelling of the feet, and in severe cases, it can involve the calves, thighs and other parts of the body.
There may be other causes of swollen feet in the fourth month of pregnancy, and it is recommended to consult the hospital in time, complete the relevant examinations, clarify the cause of the disease, and then treat it as soon as possible, so as to minimize the adverse effects of the disease.