The swelling of the body is considered to be the occurrence of generalized edema. Mechanisms of edema production: First, sodium and water retention. Second, elevated capillary permeability. Third, elevated capillary osmolarity. Fourth, decreased plasma colloid osmotic pressure. Fifth, obstruction of lymphatic fluid return. The common causes of tissue edema are: first, cardiogenic edema, such as heart failure, constrictive pericarditis. Second, nephrogenic edema, such as acute and chronic nephritis, nephrotic syndrome. Third, hepatogenic edema, liver cirrhosis, liver necrosis. Fourth, malnutrition edema, anemia, advanced cancer, burns with hypoproteinemia, etc. Fifth, drug-related edema, such as corticosteroids, etc. Sixth, ginseng edema, ginseng toxicosis can cause edema, proteinuria, hypertension. Seventh, endocrine diseases, mucinous edema caused by hypothyroidism. Eighth, limited edema. Ninth, idiopathic edema, edema without a clear cause, such as premenstrual tension syndrome, etc.