I am a patient of acute acidity and now my ESR is on higher side and I often feel pain in left side and in centre of my stomach just below the ribs. Inspite of various tests, I am not able to know that why this pain occurs. I am suffering this pain for the last six months. Although it is tolerable, but whenever I eat food I feel some stiffness on my left side also. I have examined all my blood test , thyroid etc. except ESR all reports are normal. Please advice what should I do and this pain refers to, whether it could be serious.