Chemotherapy-Induced Diarrhea: Symptoms, Causes, Treatment

Management depends on the cancer medicine and severity. Immunotherapy-related diarrhea can require a different pathway, so one prescription should not be generalized to every patient.

Related reading: Dehydration and fluid-loss warning signs.

Stools may become more frequent and watery with cramps or urgency. Thirst, low urine, dizziness, fever or blood requires prompt communication with the team.

Drugs such as irinotecan and fluoropyrimidines can affect the bowel. Antibiotics, infections, laxatives and diet may contribute; reduced immunity makes infection assessment particularly important.

Risk depends on drug type, dose, combinations, abdominal radiotherapy, bowel disease, age and nutritional status. Previous episodes warrant an advance management plan.

Assessment records frequency relative to usual bowel habits, timing, medicines and food, and checks hydration. Blood counts, electrolytes, kidney tests and stool studies may be needed.

Care replaces fluid and electrolytes and uses dietary changes and team-directed medicines; intravenous treatment or admission may be necessary. Do not automatically start loperamide with fever, blood or severe pain.

Dehydration, electrolyte imbalance, malnutrition or kidney injury may require treatment delay or modification. Diarrhea with neutropenia can be dangerous and should not await a routine visit.

Obtain a written plan and contact details before treatment, track symptoms and maintain hygiene and food safety. Follow team instructions for upcoming doses, particularly oral therapy, without independent changes.