Leg pain after standing for a long time may have the following causes: 1, chronic strain and inflammation of the muscles and fascia of the legs. If the frequent standing, prolonged standing, there is a chronic injury to the muscles and fascia of the legs, resulting in leg pain symptoms. 2, lower limb vascular disease. The actual fact is that you can find a lot of people who have been in the business for a long time. When there is a lumbar disc herniation can appear after prolonged standing, the lumbar disc herniation compression nerve and lead to leg pain symptoms, then the relevant CT, nuclear magnetic examination to further confirm the diagnosis.