After varicose vein surgery, such as swelling and pain in the limb indicate that there may be a blood clot. Stagnant blood flow and hypercoagulable state of the blood can cause blood clots, which form after thrombosis. Common thrombus are deep vein thrombosis and superficial vein thrombosis. 1. Deep vein thrombosis: Common symptoms include: swelling, redness and heat, pain or pressure. It can be treated by oral anticoagulant medication and surgery, the medication includes warfarin, aspirin, etc. Surgical treatment includes catheter thrombolysis and percutaneous mechanical thrombectomy. 2. Superficial vein thrombosis: the main symptoms are: redness, swelling, hardness, elevated skin temperature and obvious pain. It can be treated by anticoagulant drugs such as warfarin and aspirin. If thrombus has been formed, it can be treated by some methods, such as: injection of low molecular heparin to soften the thrombus, external application of traditional Chinese medicine to relieve, and of course, surgery can also be used. If thrombus is suspected, it is recommended to go to the hospital in time, and ultrasonography can be used to confirm the diagnosis. After the diagnosis is made, the patient should follow the doctor’s instructions for treatment.