Sciatic nerve pain and foot numbness are considered to be caused by compression of the sciatic nerve. The site of compression may be the popliteal fossa, such as popliteal cysts, or the pear-shaped muscle syndrome, and lumbar spine diseases, such as lumbar disc herniation, lumbar spine tumors and other compression. If you want to see a doctor at the orthopedic department of the hospital, you can analyze the site of compression with the preliminary examination. If it is considered to be popliteal fossa, improve the MRI of knee joint. If it is considered to be a lumbar spine disease, improve the magnetic resonance examination of the lumbar spine, and then do the corresponding treatment according to the results of the examination. If it is an obvious popliteal cyst compression, it can be surgically removed. If it is a herniated lumbar disc compression, you can try conservative treatment first if it is not serious, such as bed rest, traction, and the nerve-nourishing drug methylcobalamin. In the case of more severe lumbar disc herniation, minimally invasive surgery, such as foraminoscopic removal of the nucleus pulposus, can be chosen.