Patients standing for a long time leg numbness, commonly due to lumbar diseases, lower limb vascular lesions and other causes, as follows: First, lumbar diseases: patients suffering from lumbar disc herniation, lumbar spinal stenosis or lumbar spondylolisthesis and other diseases, prolonged standing will cause continuous pressure on the nerve, legs will appear numbness, accompanied by lumbar pain and lumbar spine activity restrictions, through the lumbar spine nuclear magnetic or CT scan examination can confirm the diagnosis, change the posture, bed Change of posture, bed rest and lumbar traction will significantly relieve the symptoms. Secondly, lower limb vascular lesions: such as varicose veins, prolonged standing will cause serious obstruction of venous return, patients suffering from varicose veins and other diseases, the obstruction will be more serious, the lower limbs appear stasis, the nerves will have serious ischemia, hypoxia, muscle metabolism level will also change, so the legs will appear numb feeling. Regular activity of the leg muscles to accelerate blood circulation in the lower extremities, can make the leg numbness symptoms gradually reduce, or even completely disappear. Normally, you should avoid standing and sitting for a long time to protect the leg muscles nerves and lumbar spine.