As I understand it, a "syndrome" is more a collection of symptoms than any one particular diagnosis.I'll use this example only because I know more about it: In addition to irritable bowel syndrome, I also have polycystic ovarian syndrome. The symptoms for PCOS are many: being overweight, having male pattern hair growth, depression, inability to concieve, irregular or absent periods, acne, and a host of other things. I have PCOS, but I don't have all of the symptoms. I'm not overweight, I'm not depressed, and I don't have acne. But I still have PCOS, because a syndrome is a collection of symptoms. You can have all, or a few, but it's the presence of them (in addition to some other tests to rule out other things) that the doctors use to diagnose you. In polycystic ovarian syndrome, get this: you don't even have to have cysts in your ovaries to have it!I guess what I'm trying to say is: I'm not a doctor, obvoiusly. But if I had to bet on it, I'd say that you could still have IBS without being overwhelmingly D or C. You could talk to a Dr. about it.