Upper limb and facial vascular varices, edema and cyanosis are symptoms of superior vena cava syndrome, also known as superior vena cava obstruction syndrome, which is a syndrome caused by venous obstruction in the superior vena cava or its surrounding lesions, resulting in obstruction of blood flow in the superior vena cava, resulting in varices, edema and cyanosis in the upper limbs and face. Physical examination of varicose, edema and cyanosis of upper extremities and facial vessels: In addition to the manifestations of primary diseases, the following can be seen clinically: 1. cyanosis and non-sunken edema of head and neck and upper extremities caused by obstruction of superior vena cava, accompanied by dyspnea; 2. elevated venous pressure of upper extremities; 3. angry varicose veins of chest wall, when the obstruction is above the entrance of the odd vein, the varicose veins are limited to the chest and the direction of blood flow is normal; if the obstruction is at the opening of the odd If the blockage is at the opening of the odd vein, the direction of blood flow is reversed and the varicose veins are distributed in the chest and abdominal wall; 4.If there is tracheal and esophageal compression or the laryngeal nerve is involved, there may be difficulty in breathing and swallowing or hoarseness; 5.When the cerebral venous pressure rises rapidly, it may lead to the increase of intracranial pressure and cause cerebral edema, headache, vertigo, coma, and death due to cerebral hypoxia, respiratory distress and respiratory center failure. Superior vena cava syndrome is diagnosed in anyone with the above clinical manifestations and elevated venous pressure in the upper extremities (usually up to 2.94-4.9 kPa), while the venous pressure in the lower extremities is normal. This is the main point that distinguishes this syndrome from right heart failure or constrictive pericarditis. In the latter two cases, because both upper and lower vena cava blood return is obstructed, both upper and lower extremity venous pressure is increased, and hepatomegaly and lower extremity edema often appear first, because the cause of obstruction of upper vena cava return in heart failure or pericardial constriction is not mechanical obstruction, so most of them show jugular vein anger. The venous pressure difference between the upper and lower extremities is an early sign of superior vena cava syndrome and may appear before the onset of typical clinical manifestations.