Nausea can be caused by a variety of conditions, including infection, GERD, an ulcer, or other upper GI disorders.
An upper endoscopy or upper GI series is recommended at this point. If there is concern about cancer, the endoscopy should be done.
I would also check blood tests looking for H Pylori, which is associated with ulcers or inflammation.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
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