Swelling of the feet and lower legs is mostly due to impaired venous return, or venous blood reflux, or edema under the skin due to blocked lymphatic vessels. There are also systemic systemic diseases, such as cardiac insufficiency causing a decrease in ejection fraction, so the peripheral tissue fluid increases, which can cause swelling in the legs and feet, because this is at the lowest part of the body, so it is most likely to have water and sodium retention and tissue fluid edema. If there are problems with the lymphatic vessels, such as inflammation of the lymphatic vessels or lymph node dissection, which can affect the return of lymphatic fluid, lymphoma will appear in the feet and lower legs, which will then appear as thickened, orange peel-like skin that is soft and depressed when pressed, and will recover when the hand is lifted. If there is a combination of infection, redness and swelling may occur, and if there is a venous problem, there may be an obstruction of venous return or a reflux of venous blood, which may also lead to swelling of the feet and calves.