All the tests done for ibs show that there is no disease seen and hence ibs is a functional disorder of the gi tract. My question is why should one diagnose ibs with the exclusion tests done only on the colon and endoscopy and a few other tests ex blood tests? Whenever we go to the gi docs all they do is a colonscopy or an endoscopy or a few blood tests and tell you dear there is no disease seen in these organs and hence you have ibs or functional d or functional c. But how much research/studies or tests been really done on the S/I to see if this organ is diseased or even functioning well. Maybe the S/I holds the key to solving ibs problems, since other gi organs seem to be ok and no one really knows for sure what is going on or going wrong in the S/I and it is the S/I which does most of the digestion, so in my opinion the S/I should be researched and tested more throughly.