The possible causes are:
Acid reflux : this seems the most likely cause. Such pains can be associated.
Chronic cholecystitis : the pain is usually associated with indigestion, flatulence and often with fever and vomiting. A pain from the gall bladder may be aggravated by deep breathing or sneezing as the diaphragm touches the gall bladder.
Pleurisy : An inflammation of the lining of the lungs. This is a likely cause but it is usually associated with some sort of cough and often sputum. Without this, it is less likely.
Costochondritis: If the pain is aggravated by touching, it could be due to costochondritis, an inflammation of the cartilage joint of the ribs.
You should discuss with yor doctor about these causes and ask for tests to rule them out, in particular cholecystitis.
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