10 yrs. ago I had anal cancer and chemo and radiation combined got rid of it..then 9 yrs. ago I had breast cancer, a lumpectomy (no noids). At the beginning of all this my CEA was normal. After and for the past few years it fluctuates like from 3.6 to 3.9 to 4.2 to 3.8, once it was 5 a few years ago and 6 mos ago it was 3.9. Pet scan is clear. I just found out I have gastritis. About one a month I get nausea, vomiting and diarrhea... and now going to try nexium. Question...could gastritis cause elevated CEA...Most of the time when I had my blood work checked I had been sick a day or to before with my recurring stomach flu like symptons. Thanks.