A 28-year-old client presents with a report of diarrhea. fecal urgency, LLQ pain, and weight loss. Their stool is often bloody. The client reports pain and stiffness in their elbows and knees. Which diagnosis does the care team suspect?

A. Diverticulitis: Diverticulitis typically presents in older adults with left lower quadrant abdominal pain, fever, and sometimes changes in bowel habits. While diarrhea can occur, chronic bloody stools and systemic symptoms like weight loss are not characteristic. Extraintestinal manifestations such as joint pain are uncommon in diverticulitis. B. Colon cancer: Colon cancer may cause changes in bowel habits, occult bleeding, and weight loss, but it is less common in young adults and usually does not present with recurrent diarrhea, fecal urgency, or widespread joint pain. The combination of bloody stools and systemic inflammatory symptoms points to an inflammatory bowel disease rather than malignancy. C. Ulcerative Colitis: Ulcerative colitis typically presents with bloody diarrhea, fecal urgency, cramping abdominal pain (commonly in the left lower quadrant), and weight loss. Extraintestinal manifestations, including arthritis affecting large joints such as elbows and knees, are common. The client’s age, symptom pattern, and joint involvement strongly support ulcerative colitis. D. Crohn Disease: Crohn’s disease can cause diarrhea, abdominal pain, weight loss, and extraintestinal symptoms. However, Crohn’s often involves the terminal ileum and presents with patchy, transmural inflammation. Bloody diarrhea is less prominent than in ulcerative colitis, and pain is more often right-sided or diffuse rather than strictly left lower quadrant.