When is chemotherapy before surgery recommended for rectal cancer?

Neoadjuvant treatment happens before the operation. For rectal cancer, chemotherapy may be given alone or as part of a wider plan that includes radiotherapy, depending on the tumour’s position, depth, lymph nodes, scan findings, and molecular features. Starting treatment before surgery can address cancer cells beyond the visible tumour and may allow time to assess response. Some people have surgery first or receive a different sequence. A multidisciplinary team combines imaging, endoscopy, biopsy information, and your health when recommending an approach.

Ask whether pelvic MRI, chest or abdominal imaging, colon evaluation, and tumour testing are needed for planning. Discuss bowel symptoms, nutrition, existing medicines, work, and fertility before treatment begins. Clarify how bowel function and tumour response will be checked and how the timing of surgery will be decided. Report new difficulty passing stool or urine, persistent vomiting, dehydration, or fever to your care team. Learn more about [Rectal Cancer](/conditions/rectal-cancer/) and [Chemotherapy Before Surgery](/treatments/systemic-therapy/neoadjuvant-chemotherapy/).

Seek urgent advice for increasing abdominal swelling, severe or persistent abdominal pain, repeated vomiting, inability to pass stool or gas, heavy rectal bleeding, fever, or marked weakness. Emergency help is needed for collapse, severe breathing difficulty, or confusion. These signs can indicate obstruction, infection, bleeding, or treatment effects and should not wait for a routine review.

What do my MRI and other scans show about the tumour and lymph nodes? Is chemotherapy being combined with radiotherapy? What is the goal of treatment before surgery? How will response and bowel function be monitored? Which changes should prompt an urgent call?