Patients with lumbar pain, and trigger the appearance of leg swelling, mostly may be due to the following reasons: 1, prolonged maintenance of a posture for too long or prolonged sedentary, poor local blood circulation, vascular lesions or varicose veins and other diseases, will induce patients to appear leg swelling. 2, is due to lumbar disc herniation, and lumbar spinal canal stenosis caused by. Both herniated discs and lumbar spinal stenosis can cause nerve damage and pressure changes in the spinal canal. The nerve of the sinus spine will reflect to the lumbar region and cause pain in the patient. The nerve of the leg is compressed and affects the blood vessels, causing vasoconstriction and poor blood return to induce swelling in the leg. 3. The swelling in the leg is induced by heart failure, renal insufficiency and thyroid insufficiency.