Depends. Do you mean ibs to be irritable bowel syndrome? That is a condition of abdominal bloating & cramping with alternating diarrhea & constipation. May be malfunction of the muscle wall of the intestine. Colitis is an actual inflammatory process of the wall or lining of the colon with diarrhea, fevers, colon ulcers & bleeding. Can be from infection or other inflammation. Needs medication to treat.
Colitis is 1form IBS. Ibs is a broad classification of various inflammatory diseases of the bowel that may include the small or large intestines and rectum and anus. Inflammation of the colon (colitis) is one part of the large intestine. However colitis is not always associated with ibs and may be due to other causes such as infection or ischemia or trauma. Ibs may affect the ileum and have nothing to do with colitis.