Edema in the elderly may be caused by physiological reasons, or it may be caused by pathological factors such as heart disease or kidney disease. 1. Physiological factors: the elderly due to the weaker exercise ability to maintain a position for a long time will affect the venous return, will make the tissue interstitial water increased, showing the symptoms of edema, generally increase the exercise will be recovered on their own. 2. Pathological factors: (1) heart disease: cardiovascular lesions in the elderly can cause cardiac insufficiency, resulting in decreased venous return of blood to the lower extremities, showing symptoms of edema, and the need for timely treatment of heart disease. (2) Kidney disease: when the elderly suffer from acute and chronic nephritis and other kidney diseases, it will reduce the glomerular filtration function, in addition to the combination of proteinuria will lead to hypo-proteinemia, resulting in edema, the need for timely treatment of kidney disease. Edema in the elderly is recommended to take the appropriate medication under the guidance of a doctor to treat the primary disease.