Legs with pits that do not rise are called sunken edema of the lower extremities, which is a common clinical manifestation that requires clarification of its cause based on the patient’s other comorbid symptoms and imaging examinations. The common causes are as follows: 1. Cardiac insufficiency is a common cause of sunken edema of the lower extremities, and patients often have a history of combined heart disease, paroxysmal dyspnea at night, exertional dyspnea, etc. 2. Liver insufficiency causing sunken edema of the lower extremities proves that liver function has reached the decompensated stage, and patients are often combined with coagulation dysfunction, ascites, abnormal estrogen metabolism and other manifestations of liver insufficiency. 3. . renal insufficiency is also a common cause of lower limb edema, patients mostly have chronic glomerular disease and interstitial kidney disease in the past.4. venous insufficiency of lower limbs, this kind of edema caused by low degree, no clear other symptoms, can be clearly diagnosed by deep vein ultrasound of lower limbs. The common clinical causes are the above-mentioned manifestations, so the causes need to be clarified before symptomatic treatment.