Swollen feet are found in pregnant women for the following reasons: First, if the swelling is on one side of the foot, it may be due to inflammation, trauma, mosquito bites, and blood clots on one side of the limb. Secondly, if the swelling is bilateral, it is necessary to analyze whether it occurs before 20 weeks or after 20 weeks. If it appears before 20 weeks, it is possible that chronic kidney disease or other systemic diseases existed before pregnancy, and pregnancy aggravates this abnormality. At this time, the primary disease should be treated, and diuretic and decongestant drugs should be applied. If the swelling of the feet occurs after 20 weeks, and it is bilateral, accompanied by the increase of foam in the urine and the increase of blood pressure, it may be pre-eclampsia, also known as hyperemesis gravidarum. At this time, it is necessary to treat hyperemesis or preeclampsia in order to reduce the swelling. Of course, some pregnant women may experience swelling of the feet in late pregnancy without an increase in blood pressure, which is usually less of a problem with rest, and adequate evaluation is recommended.