Edema

increased blood pressure or venous obstruction

increases capillary filtration pressure so that more interstitial fluid is formed at the arteriolar ends of capillaries

increased tissue protein concentration

decreases osmosis of water into the venular ends of the capillaries, usually a localized tissue edema due to leakage of blood plasma. also can be caused by allergic reaction and hypothyroidism

decreased plasma protein concentration

decreases osmosis of water into the venular ends of capillaries. caused by liver disease, kidney disease, or protein malfunction

obstruction of lymphatic vessels

infections by filaria roundworms by mosquito, blocks lymphatic drainage