You may have a chronic GI disorder such as ulcerative colitis, Crohn's disease or celiac disease. Or you may have a functional bowel disorder; two of the most common are irritable bowel syndrome with constipation (IBS-C) and chronic idiopathic constipation (CIC).IC has similar symptoms, such as hard stools, and infrequent and incomplete bowel movements, but is usually not associated with pain. Although idiopathic means the cause is unknown, potential factors may include changes in water balance and motility in the colon.