Cardiogenic edema generally has the edema caused by heart failure, especially right heart failure caused by the reduction of the return blood volume and blood pooling in various tissues and organs throughout the body. Its characteristics are as follows: 1. The edema usually starts from the low-hanging part of the body and gradually develops upward into generalized edema, firstly manifesting as sunken edema of both lower extremities, most obvious in the ankle bone, and gradually forming bilaterally and symmetrically; 2. It is also combined with decreased urine output and weight gain; 3. It can also be combined with some other manifestations, such as hepatic and jugular venous reflux sign, jugular vein anger, hepatomegaly, pleural fluid, ascites, cerebral edema, etc.