Whether swollen feet in 36 weeks of pregnancy is normal or not needs to be analyzed according to the causes, and it is not normal if it is caused by varicose veins of the lower limbs, high blood pressure and other diseases. The common causes of foot edema during pregnancy include physiological causes and pathological causes. Physiological causes mainly include swelling of the feet due to the growing fetus compressing the veins of the lower limbs. Long-term sedentary, shoes and socks are too tight and other bad habits, can also cause swelling of the lower limbs will easily lead to swelling of the lower limbs, generally in the adjustment of the habit of edema will also be improved accordingly. Pathological causes include insufficient protein intake, malnutrition, varicose veins of the lower extremities, hypertension and other causes, pregnant women, in addition to edema, often accompanied by generalized edema, elevated blood pressure, leg pain and leg pain and other manifestations. When severe swelling of the feet occurs, it is necessary to consult a doctor in a timely manner, and treatment should be carried out under the guidance of the doctor.