A few months ago my bowel movements changed suddenly from smooth and soft to lumpy and soft, sometimes with variations in color. I am not constipated, and often have two or more easy bowel movement a day. The change was coincidental with my starting to take CystoProtek, which is supposed to help heal bladder lining, but when I stopped taking CystoProtek the bowel movements did not return to normal so it was probably just a coincidence. I am interested in finding out what can cause clumpiness in movements that are otherwise soft and easy to pass. I am 77 years old, in case that has any relevance.