There are many reasons for edema on the body, mainly including: 1, older age, poor gastrointestinal peristalsis, malabsorption, and various causes, poor appetite, reduced intake, thus causing malnutrition, hypoproteinemia, massive exudation of tissue fluids, resulting in edema, and ascites and pleural effusions; 2, narrowing and occlusion of the inferior vena cava or deep venous thrombosis of the lower extremities, as a result of poor venous return to the lower extremities, which It leads to edema of the lower limbs; 3. Cardiac insufficiency or renal disease, diminished pumping function of the heart or reduced function of the kidneys, which leads to poor blood circulation and impaired urination, and edema; 4. Hypothyroidism, when the condition is serious, produces characteristic non-sagittal edema known as mucus edema, which often occurs in the facial area and the tibialis anterior.