What is the fastest and most effective way to reduce swollen legs is not true. Swollen legs can be caused by lower extremity venous blockage, chronic nephritis, diabetes and other diseases. Lower extremity vein blockage can be treated by venous valve repair, chronic nephritis or diabetes can be treated by taking platelet inhibiting drugs or hypoglycemic drugs under the guidance of doctor. 1. Lower extremity vein blockage: when patients suffer from lower extremity vein blockage, it may block blood circulation, resulting in poor blood return, which causes leg swelling, patients can be treated by venous valve repair. 2. Chronic nephritis: Chronic nephritis will have a decrease in glomerular filtration rate, which will lead to sodium retention, thus causing swelling of the legs, and the patient can take medicines such as captopril under the guidance of the doctor for treatment. 3. Diabetes: diabetic patients with diabetic nephropathy complications, or diabetic lower extremity circulatory disorders, can lead to the phenomenon of leg swelling, patients can take metformin and other drugs under the guidance of the doctor for treatment. Patients should be under the guidance of the doctor’s advice for medication, remember not to take it privately, so as to avoid adverse effects.