Which is better for back pain - heat or ice?

Every now and again I'll pull a muscle in my back, which happened this past Sunday. Seemed like it was getting better but is pretty tight this morning. Is it better to put heat on it, or ice? Guessing heat but want to be sure. I do have pain killers from a back spasm last year, but really don't want to... show more Every now and again I'll pull a muscle in my back, which happened this past Sunday. Seemed like it was getting better but is pretty tight this morning. Is it better to put heat on it, or ice? Guessing heat but want to be sure. I do have pain killers from a back spasm last year, but really don't want to dip back into those so want to try and fix this naturally before my son's scouting camp out on Friday....
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