Table 1.

The severity of colitis is classified according to the National Cancer Institute’s Common Terminology Criteria for Adverse Events

Grade	Colitis—clinical presentation
1	Asymptomatic
2	Abdominal pain, mucus, blood in stool
3	Severe pain, fever, peritoneal signs
4	Life-threatening consequences such as perforation, ischemia, necrosis, bleeding, toxic megacolon
5	Death