The most common symptom is diarrhea, which occurs in 92 percent of cases, followed by abdominal pain (82%) and rectal bleeding (64%). About 46% of cases include fever and 36% involve nausea and vomiting. Less often, nausea and vomiting may be present. Weight loss has been reported. Onset of diarrhea generally occurs about 6–7 weeks after starting immune<unk><unk>  therapy. Grading colitis and diarrhea The extent of diarrhea is graded based on severity, from 1 to 5. Grade 1 diarrhea is defined by an increase in the number of stools below four per day (compared with baseline). Grade 2 diarrhea is defined by an increase of 4–6 bowel movements per day. Grade 3 diarrhea is defined by an increase by 7 or more bowel movements per day. Grade 4 diarrhea involves life-threatening consequences, such as shock, whereas grade 5 results in death. The extent of colitis is also graded based on severity, from 1 to 5. Grade 1 colitis does not result in any symptoms, while grade 2 colitis leads to abdominal pain, mucous and blood in the stools. Grade 3 colitis is defined by severe pain, peritoneal signs and ileus. Grade 4 colitis is defined by life-threatening consequences, including perforation, ischemia, necrosis, bleeding, or toxic megacolon. Grade 5 colitis results in death.
Checkpoint inhibitor induced colitis
Radiation enteropathy
Radiation colitis
Alkylating antineoplastic agent
Lymphocytic colitis
Microscopic colitis
Immunosuppressive drug
NSAID hypersensitivity reactions