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In brief: Sciatic pain. Yes. Ice is an excellent anti-inflammatory option. Try alternating moist heat to relax muscles and ice to reduce swelling. Physical therapy and stretching exercises are important additions to reduce the pain and prevent recurrence of the pain.
If you have had a cortisone injection, you are asked to ice the area 20 minutes out of each hour for 6 hours, then 20 minutes on and 20 minutes off as needed for 1-2 days. Any excessive time of icing can cause freezing of the blood in the back. This can cause permanent scarring.