Sitting for a while up leg pain walk for a while on the good consider for leg muscle chronic strain, patellofemoral arthritis, lumbar disc herniation, sciatic nerve compression and other reasons. 1. Chronic strain of the leg muscles: with the prolongation of time the leg will be strain, chronic inflammation, prolonged sitting can lead to slow blood circulation in the legs, inflammatory metabolites can be stimulated on the surrounding tissue nerve endings pain symptoms, but after walking for a while after the blood circulation in the legs to speed up the inflammatory substances are metabolized, no longer stimulate the surrounding tissues, the pain symptoms will be relieved. 2. Patellofemoral arthritis: Sitting for a long time will increase the pressure on the patellofemoral joint, resulting in pain symptoms around the kneecap. After walking, the pressure on the patella is reduced and pain symptoms are relieved. 3. Lumbar disc herniation: the lumbar disc herniation can compress the lumbar nerve, leading to the patient’s side of the leg pain, mostly from the buttocks to the distal end of the radiating pain. When the lumbar pain disappears, the leg pain symptoms will also be reduced. 4. Sciatic nerve compression: patients with lumbar disc herniation, intraspinal tumor, lumbosacral radiculitis, etc. can compress the femoral nerve and cause numbness and pain in the lower limbs. If the leg pain is serious or the pain is not relieved for a long time, it is recommended to go to the hospital in time for examination and targeted treatment.