I either strained a muscle or my chest muscles are inflamed again. Nothing new I have does this before 1 time even went to the hospital because I thought it was a heart attack. This happened last night around 8pm and I still hurt. All this hurting just because I wanted to stretch last night. I guess it was to big of a stretch because within 2 mins the muscles started to hurt. I'll be happy in a day or 2 when the pain stops.