Swollen legs and feet of pregnant women are the most common symptoms during pregnancy, especially in the second trimester. This situation is divided into physiological and pathological, if it is physiological, in most cases after resting can be relieved, usually in the daytime is more serious, the early rise of the time is more mild, this situation does not need special treatment, this and the uterus enlargement compression of the inferior vena cava reflux obstruction of the phenomenon of oedema has a certain relationship. This situation usually try to do low-salt, low-fat diet, do not stand for a long time, usually try to put the feet flat, conducive to blood circulation, reduce the phenomenon of edema. Hypertensive disorders during pregnancy, pregnancy combined with kidney disease can also cause lower limb edema.