The feeling of swelling in the lower body in the 5th month of pregnancy is considered to be due to the increase of the fetus, which leads to the increase of the uterus and the compression of the lower body, resulting in the obstruction of the reflux and the feeling of swelling, and the increase of the uterus during the growth of the fetus, which involves the abdominal ligament and leads to pulling pain, all of which are physiological manifestations and do not require special treatment. You should pay attention to rest, do not overexert yourself, stand for a long time, and try to take rest in the left side. After pregnancy, most of the uterus will be right-sided, which will compress the abdominal aorta. Long-term right-side lying will easily lead to poor blood circulation, which will restrict the supply of nutrients to the fetus and affect the growth of the fetus, resulting in fetal ischemia and lack of oxygen in the uterine cavity.