Which description best matches the diarrhea commonly seen with ulcerative colitis?

• A. Bloody
• B. Green and frothy
• C. Gray with observable fat
• D. Clay-colored

Answer: (A)

Bloody diarrhea is most consistent with ulcerative colitis because the disease causes continuous inflammation and ulceration of the colonic mucosa. When the mucosa is inflamed and eroded, small blood vessels bleed into the stool, so patients often pass stools that are blood-tinged or contain visible blood along with mucus. This bleeding is a hallmark feature and reflects the colonic mucosal injury central to UC.

Descriptions like green and frothy, gray with visible fat, or clay-colored stool don’t fit UC as well. Green and frothy can point to rapid transit with bile or gas, or certain malabsorption issues; gray with fat suggests steatorrhea from fat-malabsorption conditions; clay-colored stool implies lack of bile pigments from biliary obstruction. In UC, the key image is blood-streaked or blood-containing stool accompanying diarrhea, sometimes with mucus and urgency.