The phenomenon of swollen legs in the second trimester is common during pregnancy, because the enlargement of the uterus in the second trimester will lead to obstruction of venous return, and the phenomenon of swollen legs will occur. During this period, you should pay attention to proper rest, do not sit or stand for a long time, usually try to take a rest in the side lying position, when sitting for too long you can put your legs flat, which is conducive to promoting blood circulation. You should also pay attention to adjusting your diet, pay attention to not eating too salty food, and control the salt intake, otherwise it will aggravate the leg swelling. You should also pay attention to check blood pressure, in the middle and late stages of pregnancy, blood pressure increases, which can also lead to obstruction of reflux and affect the kidneys, which can lead to swollen legs, so you need to use antihypertensive drugs to control blood pressure and relieve symptoms.