Hello! Thank you for the query. Large intestine main function is to absorb water from the stool. If you remove a part of it, the stool gets less solid, and even diarrhea can appear. This is normal as digestive tract needs to get used to shorter intestine. Such situation can be present for a month or two. Other possible reason of your symptoms is gastrointestinal infection. It is more possible if you have been using antibiotics after the surgery. If there are also any abdominal pains or cramps, diarrhea and constipation alternately, partial bowels obstruction due to intestinal junction tightness should be considered. I suggest you to visit your surgeon for physical examination. In case of any doubts, stool tests and abdominal X-ray should be done. Hope this will help. Regards.