What causes leg swelling due to lower limb venous thrombosis?

The main causes of leg swelling due to lower extremity venous thrombosis are as follows: 1. **Impeded Blood Flow**: Venous thrombosis blocks the venous return pathways in the lower limbs, limiting local venous return and subsequently causing tissue edema, which manifests as leg swelling. 2. **Microcirculation Disorders**: The formation of venous thrombosis disrupts blood flow and venous return in the lower limbs, leading to microcirculatory disturbances that exacerbate leg swelling. 3. **Blood Viscosity Effects**: Increased blood viscosity can lead to vascular thrombosis, plaque formation, and occlusion, further impairing circulation and worsening leg edema. 4. **Damage to Deep Venous Valves**: Deep venous thrombosis may damage the deep venous valves, resulting in valvular insufficiency that prolongs leg swelling. If related symptoms occur, prompt medical attention should be sought, and treatment should follow the recommendations of qualified healthcare professionals.