I am kumar, male, aged about 56 years and residing in chennai. I am suffering with digestive disorders such as lack of appetite, indigestion, severe underweight, malnutrition, slight watery stools, rapid graying of scalp and facial hair, eczema on face, constipation, and a feeling of heaviness in the stomach. I had undergone endoscopy 4 times and colonoscopy once and RUT test. Nothing was revealed except gastritis, IBS, non specific proctocolitis and GERD. I had undergone stool tests on 4 0ccasions but only once giardia lamblia was detected. Even stool culture test did not reveal anything. Is there any test to determine nature of microbiota in the intestine. I am severely under nourished and underweight. I do not feel like taking food. One gastro doctor at chennai suggest for cat scan of abdomen. I am afraid to undergo this test as I am scared of exposure to radiation. Can any one suggest some good probiotics and probiotics to cure this nuisance disease permanently. Will chronic giardiasis of long duration cause cancer? Can any good doctor advice me a good and permanent cure. Thanking you,