The nerves are compressed and people then experience the symptoms of pain, weakness, and numbness. Other conditions, such as spinal stenosis, spondylolisthesis, or piriformis syndrome can also cause sciatica symptoms by irritating the sciatic nerve.
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Quanera Hayes, Allyson Felix, Shakima Wimbley and Phyllis Francis of the United States celebrate winning gold in the Women's 4x400 Metres Relay final during day ten of the 16th IAAF World Athletics Championships London 2017 at The London Stadium on August 13, 2017 in London, United Kingdom.(Matthias Hangst/Getty Images)