Swollen feet with craters when pressed are the result of poor venous return in the lower extremities. There are many reasons for poor venous return in the lower extremities, such as thrombosis of the lower extremity veins, thrombosis of the inferior vena cava, and cardiac insufficiency. In addition, there are many other causes of hypoproteinemia that lead to edema of the lower extremities. When edema is detected, cardiac ultrasound and vascular ultrasound should be performed to find out whether the veins of the lower extremities are open, whether there is cardiac insufficiency, and whether there is hypoproteinemia. After the cause of the condition is clearly defined, treatment can be given to address the cause of the condition, such as anticoagulant treatment for venous thrombosis, cardiac insufficiency, cardiac diuresis, and supplementation of proteins in cases of hypoproteinemia.