How do you tell the difference between ulcerative colitis and Crohn's disease?

Location for one. It can be difficult to tell between the 2 at times. Location is important. Ulcerative colitis always involves the colon starting with the rectum. Crohns can follow any distribution in the gut and often involves the small intestine, especially the terminal ileum. There are also differences when tissue specimens are viewed under the microscope. There are blood tests which can be helpful too.
Location. Ulcerative colitis (uc) and crohn's disease (cd) are both inflammatory bowel diseases that share many characteristics and symptoms. In uc, the rectum/large intestine are usually involved, and the inflammation is continuous. In cd, the small intestine is more likely to be involved, and the inflammation skips around to different locations they can be differentiated with a colonoscopy and endoscopy.

Related Questions

What are symptoms of Crohn's disease and ulcerative colitis?

See below . Ibd usually presents with lots of diarrhea (mucousy, bloody or just loose). Some have bad pain, cramping, nausea, wt loss etc. Read more...
Many possibilities. There are many potential symptoms: weight loss, diarrhea, abdominal pain, vomiting, iron deficiency, fatigue, blood in the stool, arthritis, fever. Any of these could be symptoms. Its a tricky disease unfortunately. Read more...

What is the disparity between Crohn's disease and ulcerative colitis?

Difficult problem. Both crohn's and ulcerative colitis are difficult problems with diagnosis made at biopsy. The surgical procedures include resection, ostomy, anastomosis and are added when medical therapy alone is not able to control. Neither disease is curable, both are managed with medication and diet with avoidance of irritants like gluten, fat, lactose. Bile binders can help. Be well. Read more...
Unclear question. If by disparity you mean "the difference between" then: ulcerative colitis affects just the large intestine(colon) and causes bloody diarrhea and abdominal pain. The inflammation is superficial on the bowel lining. Crohns causes deep inflammation through the whole bowel wall and affects anywhere in the GI tract from lips to anus.Symptoms of crohns can be more severe and can cause bowel obstruction. Read more...