I can understand your concern but your question is a bit incomplete.
You haven't mentioned which side pains. Does it pain on any particular side or both sides or in the middle.
Do you smoke?
It could be gastritis, pleurisy etc. More detailed history and examination can hint at what's wrong and that will be needed to be confirmed by certain tests.
As of now, I would suggest you drink lots of water, take a capsule pan-l once a day half an hour before food.
Avoid smoking, drinking.
Avoid tea/coffee/ carbonated beverages.
Consult a physician near you for further evaluation and management of your case.
Dr. Anil Kumar Jain.