Patients with venous thrombosis of the upper extremities can self-judgment through observation and symptoms. In patients with upper extremity venous thrombosis, the subclavian vein is mostly thrombosed. The vein is a channel for blood return, and because the thrombus is blocking the vein, arterial blood is unable to return after flowing through the distal end, and the patient can be observed to have swelling in the upper extremity, which mostly spreads from the fingers to the entire upper extremity. Venous stasis can also be seen in the form of a blue-purple coloration of the skin. As the swelling worsens, the patient may experience pain in the upper extremities, which in milder cases is only a soreness and distension, but the pain is significantly aggravated by strenuous activity of the upper extremities, and varicose veins of the upper extremities may be detected after the onset of phlebitis. Varicose veins of the upper extremities can also be detected after the onset of the disease. Phlebitis is accompanied by an increase in skin temperature and fever. Patients with varicose veins of the upper extremities need to go to the hospital in time to avoid delays.