I Have Muscle Tenderness And Pain On My Left Side,

I have muscle tenderness and pain on my left side, over my ribcage. The tenderness and pain start at the center of my rib cage and extend around to my spine. I have felt this way for three days. The pain comes and goes over time. When I get home from work, had supper, it started, extended over night and until I woke up in the morning. By late morning or early after noon the pain and tenderness ebbs.