I am kumar,residing in chennai.For the past 25 years I am suffering with digestive issues such as indigestion ,severe constipation,falling of mucus from stools,watery stools initially.I got endoscopy done 4 times and also colonoscopy done on one occasion.These tests indicated nothing serious other than non specific proctocolitis,IBS,Gastritis etc.I got stool tests done on 4 occasions and also culture test done on one occasion.In one of the tests presence of giardia was detected.But I have chronic loss of appetite,malabsorption of food,severe weight loss.My doctor who conducted endoscopy, was a general surgeon, who opined that due to accumulation of pathogenic microbes in the intestine is causing these digestive issues.I am afraid whether these long unsettled digestive issues may cause more serious problems such as cancer. Kindly advice.