I m 50yr old female, hypothyroid, overweight, going through perimenopause. Past 2 days I have felt soreness in stomach area - center area right below sternum. Not pain, just a bit sore. Soreness is constant but mild. No nausea or diarrhea. Able to take deep breaths just fine. Could it just be the way I sit at my desk at work? Sometimes I find myself slumping forward as I work at my computer.