I had this and doctor put me on PPI's to heal possible ulcer.
Hi SH53,
Do you have any other symptoms (pain, diarrhea, vomitting, etc.)? Are there any patterns to the nausea? Does it happen in relation to meals or does it get worse after meals or on an empty stomach? Do fatty or fried foods make it worse? Does anything make it better? Have you tried a low-fat (under 35 mg) diet for a week or so?
Nausea alone is a symptom of too many things to list.
All the best,
Sam