Firstly, it is necessary to avoid infusing solutions that irritate the venous wall, remove venous catheters early, and actively treat varicose veins; secondly, some anticoagulant and anti-platelet aggregation drugs such as heparin and aspirin can be used for prevention. For patients who have undergone major surgery, postpartum women, or those with chronic diseases requiring long-term bed rest, they should be encouraged to perform active movements of the lower limbs while in bed, and do deep breathing and coughing exercises. If necessary, passive ankle joint pedal movements can be performed, and wearing graduated compression stockings or...