Severe back pain when breathing?

I would guess you have a strained muscle since you say it hurts with all movement. Most likely, it's the trapezius, which runs from your jaw (explains the yawning pain) to your midback and out to the side.

The doctor will listen to your chest, feel your back to check for muscle spasm and tenderness, and may do an x-ray or other study if it's indicated.

But I suspect that he will tell you to put heat on it and take ibuprofen.

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