Soreness in the lower extremities while standing or during exercise can be caused by lumbar pathology. First, a lumbar disc herniation can cause this symptom, and stenosis of the lumbar spinal canal can also cause pain in the legs after standing as well as walking. Secondly, other diseases, such as scarring of the foraminalis medialis muscle at the junction with the sciatic nerve, can irritate the sciatic nerve and cause pain in the legs after standing or moving around. In case of the above mentioned causes, it is recommended to go to the hospital for an MRI of the lumbar spine to rule out lumbar disc herniation and lumbar spinal stenosis.