The early stage of venous thrombosis usually has no specific symptoms, but may be characterized by local swelling, pain, superficial varicose veins and so on. 1. Local swelling: venous thrombosis can block the vein, resulting in local venous return obstruction, which leads to local blood stasis, resulting in local tissue edema, edema can further squeeze the local lymphatic vessels, resulting in obstruction of lymphatic return making the swelling obvious. 2. Pain: venous thrombosis can block the veins, leading to ischemia and hypoxia of the patient’s tissues, resulting in ischemic pain. In addition, the swelling caused by venous thrombosis can also squeeze and irritate the nerves, resulting in pain. 3. Superficial varicose veins: After the formation of venous thrombosis, the local venous blood return obstacle will easily make the stagnant blood spread to other veins, resulting in the increase of blood in the superficial veins, which can lead to superficial varicose veins. There are no obvious symptoms in the early stage of venous thrombosis, so if you suspect venous thrombosis, you should consult the hospital in time, and actively diagnose and treat it, and cooperate with the doctor to carry out thrombolytic therapy if necessary.