Sitting for a long time the calf stomach swelling, to consider the lower limbs due to venous reflux obstruction or reflux obstruction caused by. In this case, you can see the possibility of the patient’s lower limbs appear swollen, once the lower limbs reflux obstruction, then there will be leg swelling, and even in the venous system will form the possibility of thrombus, in the lower limbs after the formation of venous thrombus, once dislodged into the cardiac cavity, and then into the pulmonary artery, may lead to an extremely serious disease, called pulmonary artery embolism. Pulmonary artery embolism is a disease that causes the patient to cough, cough up sputum, cough up blood, have difficulty breathing or even chest pain and other symptoms, and it is an extremely critical disease, and once a pulmonary artery embolism occurs, it can be life-threatening. So it is not possible to sit in one place for too long, you should sit for a period of time to get up and move around, in order to prevent the formation of blood clots in the veins of the lower extremities.