Abdominal cramps and diarrhea (often bloody)
Mild
<4 bowel movements per day
No systemic symptoms
Few extraintestinal manifestations
Occasional constipation and rectal bleeding
Moderate<unk>  extends to splenic flexure
Severe
Frequent BM
Anemia
Fever
Weight loss
Frequent extraintestinal manifestations
Pancolitis
<4 bowel movements per day
No systemic symptoms
Few extraintestinal manifestations
Occasional constipation and rectal bleeding<unk>  extends to splenic flexure
Frequent BM
Anemia
Fever
Weight loss
Frequent extraintestinal manifestations
Pancolitis
Ulcerative colitis
Infectious colitis
Stercoral colitis
Ischemic colitis
Crohn's disease
CMV colitis
Irritable bowel syndrome
Crohn's colitis