Hello, Thank you for contacting HCM I understand your concern, I am Dr Arun Tank, Infectious Disease Specialist answering your query. ESR is erythrocyte sedimentation rate, and LDH is lactate dehydrogenase. ESR is the marker of the nonspecific inflammation, as you have CA stomach it may be raised because of the inflammation associated with it. Some tumors produce LDH, it is a one type of enzyme which arises from the cancer producing cells. So once you get treatment for the cancer, this marker will start disappearing. X ray are normal but cancer producing cells are much smaller and cant be detected in the x ray. That is why your X ray is appearing normal. You can ask for further queries here on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious Disease specialist We wish you a best health at health care magic.