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Since you have the symptoms from quite some time and also weight loss
, we need to take this further by a procedure called colonoscopy
, this will give us an idea about the changes happening internally in the intestines and the mucosa, we can look for any growth , tissue changes , blood , and any malabsorption
This is a safe test and hardly any complications ,it is surely recommended in your case and I will ask you to go ahead for it, so that we can find the exact cause for your symptoms and treat it specifically