Consider physiological factors and pathologic factors, such as lumbar disc herniation, lumbar spinal stenosis, rheumatoid arthritis, varicose veins and other causes. 1. Physiological factors: for example, standing for a long time or in one position for too long can cause poor blood return to the lower limbs, resulting in sore legs, which can be relieved by resting and elevating the lower limbs. 2. Lumbar intervertebral disc herniation: the herniated nucleus pulposus compresses the nerves, resulting in soreness and sometimes numbness in the lower limbs. 3. Lumbar spinal stenosis: osteophytes or hypertrophy of ligamentum flavum compresses the spinal nerves, resulting in lower limb pain and limping. 4. Rheumatoid arthritis: joint inflammation stimulates the surrounding tissues to appear soreness, joint swelling, morning stiffness. 5. Varicose veins: blood reflux obstacle, blood serum protein infiltration into the tissue gap, leg pain. In addition to the above reasons, there are also lower extremity venous thrombosis, muscle strain, too much exercise, etc., the appearance of two leg pain after rest did not get better recommended to go to the hospital for further examination.