The causes of leg swelling are mainly considered to be related to prolonged standing or sitting, neurological lesions, inflammation, vascular diseases, tumor growth or trauma. 1. Prolonged standing or sedentary: If you stand or walk for a long time, or sit for a long time during a long trip, the venous return of the lower limbs can be affected, which will cause leg swelling, and the symptoms can be relieved after lying down and elevating the lower limbs. 2. Neurological lesions: If the peripheral nerves of the lower limbs are damaged or the lumbar spine is compressed, it will easily affect the sensation of the legs, which will lead to the symptoms of leg swelling. 3. Inflammation: Inflammation of the legs, such as fasciitis and other inflammatory stimuli, can easily lead to an increase in inflammatory exudate, resulting in leg swelling, and even accompanied by pain. 4. Vascular disease: when there are varicose veins or venous thrombosis in the lower limbs, it will easily affect the blood return, thus resulting in the feeling of leg swelling. 5. Tumor growth: if there is tumor growth in the lower limbs, such as bone tumor, the tumor is easy to produce occupying effect and oppress the surrounding tissues, so it triggers the symptoms of leg swelling and pain. 6. Trauma: If the leg is impacted by external force, resulting in local injury, it is easy to have the phenomenon of increased tissue exudate, thus triggering the manifestation of leg syndrome. Long-term leg swelling, it is recommended to seek medical attention to clarify the cause, but also need to rule out the possibility of diabetic complications and gout and other diseases, it is recommended that targeted treatment under the guidance of a professional physician, so as not to affect the function of the movement.