The common causes of particularly pronounced venous vascularity in the left abdomen include portal hypertension, Buga syndrome, etc. The treatment includes medication such as thrombolytic drugs and surgical treatment. 1. Portal hypertension: portal hypertension is a clinical syndrome of elevated pressure in the portal vein due to various reasons. Prolonged lesions lead to the establishment of collateral circulation, which can result in the expansion of the venous blood vessels in the left abdomen, which is clearly visible. The main clinical symptoms are ascites, esophagogastric varices, and splenomegaly. Treatment includes medication such as propranolol, carvedilol, furosemide, etc. If the condition is serious, it can be treated by surgery, such as portal-body vein shunt, portal-serial vein dissection. 2. Bugart’s syndrome: Bugart’s syndrome is often caused by obstruction of the hepatic vein or the inferior vena cava above its opening, which can also lead to elevated portal vein pressure, hepatic stasis and enlargement, and the establishment of collateral circulation, which can lead to obvious venous vascularization of the left abdominal area. The main symptoms are ascites, bilateral lower extremity edema, and esophagogastric fundus varices. Drug treatment includes urokinase, low molecular heparin, etc. Serious condition can be treated by surgery such as jugular intrahepatic portal vein shunt and liver transplantation. When the patient is not feeling well, he should complete the examination and follow the doctor’s instruction after the diagnosis is clear.