Sitting in a car, especially for a long time in the car appeared in the feet edema, the vast majority of reasons because of the bilateral lower limbs of the blood reflux is not good and appeared, and this situation and heart disease, kidney disease and other systemic diseases have no relationship. Sitting in a car for a long time leg edema, especially bilateral symmetrical edema, easy to happen in the elderly, especially the double lower limb blood vessels have atherosclerosis and double lower limb blood vessel elasticity is not good on the body, then you need to elevate the bilateral lower limbs. If necessary, ultrasound of the arteries or veins of both lower limbs should be performed to detect the presence of thrombus at the same time. If a thrombus is present it is necessary to actively search for the cause, whether this thrombus is a proximal or distal thrombus. The distinction between proximal and distal thrombosis is made on the basis of the knee; if it is a proximal thrombus, anticoagulation is required, and if it is a distal thrombus, dynamic observation is all that is required, without active anticoagulation. Whether it is a proximal or distal thrombosis, the cause needs to be sought to prevent serious adverse consequences.