I will work a lot better than naproxin with my experience and of course get it looked at to see if it's muscle, nerve or disc.
If its muscle then use ice and maybe anti inflammatory for a while. Ice 30 minutes on, 30 minutes on repeat 3x in a row 3x a day.
If it's nerve such as siatica again ice the same and if that doesn't do much in 2-3 days look into prednisone.
If it's disc then you need to not put pressure on it and try decompression. It could take several months to heal.
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