(Family Features) Symptoms of inflammatory bowel disease (IBD) range from diarrhea and abdominal pain to nausea, fever, loss of appetite, fatigue and, at times, rectal bleeding. No single test can confirm IBD, which includes Crohn’s disease and ulcerative colitis. IBD affects nearly 1 in 100 people living in the United States, according to a study led by the Crohn’s & Colitis Foundation. There are currently no cures for IBD.