Loose stools can be indicative of IBS, but I would consider other causes first.
Inflammatory bowel disease, colitis, infection, pancreatitis, and malabsorption can also lead to these symptoms.
Workup to consider would include a colonoscopy, CT scan of the abdomen as well as stool studies to exclude malabsorption or infection. A blood test for celiac disease can also be considered.
These options can be discussed with your GI physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
www.kevinmd.com