Hi, Diseases and other conditions that may cause such signs and symptoms include: Celiac disease Crohn's disease (a type of inflammatory bowel disease) Hyperthyroidism (overactive thyroid) Irritable bowel syndrome Medication side effects Ulcerative colitis. If more-frequent bowel movements are also accompanied by any of the following signs or symptoms: Changes in the consistency, volume or appearance of your bowel movements, such as repeatedly passing narrow, ribbon-like stools or loose, watery stoolsAbdominal painBlood, mucus or pus in your feces, consult physician.....