Cancer-related diarrhea can be seen in patients with carcinoid tumors, carcinoid syndrome, gastrointestinal tumors, and hormone-producing tumors. Patients undergoing high-dose chemotherapy and patients receiving radiation therapy to abdominal and pelvic areas are more susceptible to diarrhea. Radiation-induced diarrhea is seen most often with radiation to abdominal and pelvic fields. Acute radiation enteritis can be seen in up to 70% of patients, depending on treatment and patient predisposing factors. Late-onset effects, manifested as chronic enteritis, can occur months or years after treatment.
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