Problems with the lumbar spine that involve the sciatic nerve can produce symptoms of calf pain. Problems in the lumbar spine are commonly caused by degeneration, hyperplasia, collapse of the lumbar spine and narrowing of the intervertebral space, lumbar disc herniation, lumbar spondylolisthesis, lumbar spinal stenosis, etc., which may lead to compression and stimulation of the nerve roots of the sciatic nerve in the lower extremity, resulting in congestion, edema, and inflammatory reactions of the nerve roots and corresponding symptoms in the sciatic nerve travel area, including soreness and pain in the lower leg. The sciatic nerve is the main nerve of the lower extremity and has sensory and motor functions. When there is abnormal sensation, it will lead to soreness and pain in the lower leg, and if there is abnormal motor function, it will lead to muscle weakness, resulting in lower extremity activities being affected.