Pressure and percussion pain in the kidney area is caused by various diseases in the kidney area, and pressure and percussion on the kidney area with the hand will produce painful phenomena. The common causes of renal vein thrombosis include two types of diseases: first, blood hypercoagulable state, common diseases causing blood hypercoagulable state include nephrotic syndrome; severe dehydration in infants and children; pregnancy or oral contraceptives; congenital thrombosis such as congenital antithrombin III deficiency, congenital protein C deficiency, etc.; systemic lupus erythematosus myelofibroplasia, etc. Second, damage to the vein wall common diseases causing damage to the vein wall include renal cell The common diseases that cause damage to the vein wall include renal cell carcinoma invading renal vein; renal trauma; adjacent organ tissue lesions compressing renal vein, such as enlarged lymph nodes, abdominal aortic aneurysm, etc. Pressure pain and percussion pain in the renal area is one of the clinical manifestations of renal vein thrombosis. The clinical manifestations of RVT may have no special clinical manifestations and may have some clinical symptoms such as fever (17%), acute back pain (10%-64%), renal pressure and percussion pain, sudden onset of hematuria (74%), elevated blood creatinine, and enlarged kidneys (43%) on ultrasound examination. The possibility of RVT should be noted when these symptoms are found in patients with nephrotic syndrome. However, the majority (75%) of RVT is without typical clinical manifestations (chronic or subclinical type), and there is no obvious relationship with fluctuations in the condition of nephrotic syndrome. Renal vein thrombosis is a series of pathological changes and clinical manifestations caused by thrombosis within the main trunk and/or branches of the renal vein, resulting in partial or total obstruction of the renal vein. Renal vein thrombosis can occur unilaterally or bilaterally, either in a single branch of the trunk or in multiple branches, or in conjunction with thrombosis of other organ vessels. Acute renal vein trunk thrombosis can be complicated by acute renal failure, while the clinical manifestations of chronic renal vein thrombosis are not obvious because there is sufficient time to form collateral circulation to improve renal venous return, and the majority of renal insufficiency is reversible.