Jugular vein thrombosis is damage to the lining of the jugular veins. It is caused by slow blood circulation in the neck and stagnant circulation.People in their 30’s are likely to get jugular vein thrombosis. The main causes are venous puncture or trauma, superior vena cava syndrome, tumors and so on. 1. Venous puncture or trauma to the internal jugular vein: This is the most common cause of jugular vein thrombosis. Trauma or venous sheaths damage the endothelial cells of the vein. The venous sheath is a foreign body relative to the vein and combines to cause thrombosis of the internal jugular vein. 2. Superior vena cava syndrome: Obstruction of superior vena cava reflux and increased pressure in the superior vena cava leads to thrombosis of blood in the vein. 3. Tumor, etc.: causing thrombosis of internal jugular vein. At the same time, if there is lung cancer tumor can also be compressed, the blood return of internal jugular vein is obstructed thrombosis. In addition, some internal diseases, such as easy embolism, 30 years old is also prone to jugular vein thrombosis. If you have jugular vein thrombosis at the age of 30, you need to consult a doctor as soon as possible, complete the examination, make a clear diagnosis and then follow the doctor’s instructions to be treated accordingly, to avoid delaying the condition.