question: I feel on my bottom and am heavy set person. I didn t feel much pain day but am experiencing pain on upper side of the back above waist area. I can sit slouched and feel some comfort but when I try to straighten up both sides hurt real bad. When I cough or laugh it well hurt real bad and sometimes when I move well get so tight. It feels like someone has a tight grip on the sides of my upper waist. Not sure if this could be a strain in muscles or could I have cracked ribs?