The main symptoms of superior vena cava syndrome include bruising of the veins of the head, face, neck and upper chest leading to edema and even cyanosis. Superior vena cava syndrome refers to a series of symptoms caused by a blockage of the superior vena cava and its branch vessels, which prevents blood from returning through the superior vena cava. As a result of the blockage of the superior vena cava, the patient may suffer from edema of the face and upper limbs, superficial cervico-thoracic vein varicose and dyspnea, and some patients may suffer from respiratory distress, coughing, difficulty in swallowing, hoarseness, etc. The symptoms of superior vena cava syndrome are classified into simple vena cava syndrome and simple vena cava syndrome. Superior vena cava syndrome is divided into two categories: simple and compound. Simplex: obstruction of the superior vena cava above or below the entrance to the singular vein, with edema of the head, face, neck, and upper chest. Complex: obstruction of both the singular vein and the superior vena cava, with severe symptoms of bruising, congestion, and unilateral edema, swelling, and distention of the lower extremities if accompanied by lower extremity obstruction. In some severe cases of superior vena cava syndrome, cerebral edema and increased intracranial pressure may even occur. Therefore, if the patient has the above symptoms, it is recommended to go to the hospital for examination and diagnosis in time and active treatment.