Hello, thanks for the query. by looking at your husband s age and paleness , should rule out any malignancy. all the gastro intestinal tract malignancies are can not be diagnosed with endoscopy and colonoscopy... i suggest you to do capsule endoscopy or if you are in developing countries you can do barium studies.. can try dewarming by giving single dose of anti helmenths, because hook warm infestation can cause anemia and low iron levels and about the lymphoma history you had given it looks like thalassemia which can be treated by iron infusion in some minor types,, Hope this will help feel free to ask further