There is sometimes confusion about distinguishing between Crohn’s disease and ulcerative colitis. This may be referred to as indeterminate colitis especially if the inflammation and ulcerations are present in the colon and rectum only without the typical penetrating features and skip lesions that Crohn’s patients may have. When Crohn’s is present in the colon, this is referred to as Crohn’s colitis, NOT as someone having both ulcerative colitis and Crohn’s disease.
As such, in recent years, Crohn’s and ulcerative colitis (and the specific locations the disease presents in) are being referred to as spectrum, or continuum, of inflammatory bowel diseases, rather than two separate diseases. Doctors focus more on the location of the disease and how it is presenting rather than categorizing as specifically Crohn’s or ulcerative colitis.