Do you have any other symptoms? Could be a strained intercostal muscle (muscles in between your ribs). Does the pain move or improve when you change position? I had horrible pain once on the left side of my chest that just came out of nowhere. Ended up being a strained muscle but MAN I never felt pain like that before! Hope you feel better.
I had that recently. It hurt in my back on the lower left.(everytime I took a breath)
I thought it was a kidney stone but turned out to be pneumonia. I had NO cough or congestion at all. I did have a fever.
2 courses of anti-b's and I'm all better
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