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Pain in back and chest at age of 77 yrs requires investigation to find the cause whether it is related to stomach like gastritis;hiatus hernia;gastric ulcer ;or it from the back due to spine either dorsal spine spondylisis or nerve root compression
unfolding of aorta
or some swelling in or around lungs .First get basic investigation like X-ray of dorsal spine then let him take antacids like Ranitidine
300mg twice a day.It will control gastritis .Once you find the cause may be you can go ahead with further treatment by Ayurvedic form of medicine.