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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See where last year's Voice 2013 finalists are now... Team Danny singer Andrea Begley (controversially) beat Leah McFall in last year's final to win the series. Andrea, who was mentored by Danny O'Donoghue, went on to release her debut album in October.