Common symptoms of lower limb deep vein thrombosis ① sudden swelling, pain, red or pale color of lower limb or lower leg ② local pressure pain in lower leg or pain when walking ③ long-term swelling of lower leg, aggravated after activity or in the afternoon, reduced after rest or early in the morning ④ skin color of lower leg deepens in patches, accompanied by itching, or local pain, or even rupture for a long time What are the dangers of lower limb deep vein thrombosis? In early stage, the thrombus is unstable and easy to fall off, if not treated in time, the thrombus can cause pulmonary embolism after falling off, which can cause chest pain and cough in light cases and endanger life in heavy cases. Inadequate treatment at the later stage can lead to post-thrombotic syndrome, which can cause long-term swelling of the lower limbs and even skin breakdown for a long time. What should I do if I get the sequelae of lower limb deep vein thrombosis? First of all, you must choose a vascular surgery specialist in a regular hospital to consult. We will do ultrasound or deep vein angiography of lower limb and CT of iliac vein.