Guide — Oncology
Colorectal Cancer Nursing Care
One of the most common — and most preventable — cancers, because screening removes precancerous polyps before they turn malignant. Nursing care emphasizes screening, recognizing the warning signs, and supporting patients through resection and possible ostomy.
9 min read · Oncology
Educational use only. Diagnosis, staging, and treatment selection are provider-directed and individualized. This guide is educational background for nursing care. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Overview
Most colorectal cancers are adenocarcinomas that develop through the adenoma-to-carcinoma sequence — a benign polyp slowly becomes malignant over years. That slow timeline is why screening with polyp removal is so effective. Tumors spread by direct extension, to regional lymph nodes, and to the liver (the most common metastatic site). The CEA tumor marker is used to monitor treatment response and recurrence (not for screening).
Key Concepts
Risk factors
Age (≥45), family history and inherited syndromes (FAP, Lynch/HNPCC), inflammatory bowel disease (ulcerative colitis > Crohn’s), adenomatous polyps, a high-red/processed-meat low-fiber diet, obesity, smoking, and alcohol.
Right-sided vs left-sided presentation
Right (ascending) colon: wider lumen, liquid stool — presents insidiously with occult bleeding and iron-deficiency anemia, fatigue, and a mass. Left (descending)/rectal: narrower lumen, formed stool — presents with a change in bowel habits, narrowed (pencil) stools, obstruction, and visible rectal bleeding. Unexplained iron-deficiency anemia in an older adult is colorectal cancer until proven otherwise.
Screening
Colonoscopy is the gold standard (visualizes and removes polyps; every 10 years if normal from age 45). Stool tests — FIT (fecal immunochemical) or FIT-DNA — are alternatives; a positive stool test requires a follow-up colonoscopy. (See the screening reference.)
Treatment
Surgical resection (colectomy) is the mainstay; some tumors require a temporary or permanent colostomy. Chemotherapy (e.g., FOLFOX) ± targeted therapy and radiation (for rectal cancer) are added by stage.
Assessment Findings
Ask about a change in bowel habits (new constipation/diarrhea, narrowed stools), rectal bleeding or blood in stool, abdominal pain/cramping, unexplained weight loss, and fatigue. Check for iron-deficiency anemia and a palpable abdominal mass. Review screening history and family history. Post-op, assess the incision, bowel function, and any new ostomy/stoma.
Nursing Priorities
Perioperative care
Support bowel prep and pre-op teaching, then post-op monitor for return of bowel function, ileus, infection, and bleeding, manage pain, and advance diet as tolerated.
Ostomy care & assessment
If a stoma is created, assess it: a healthy stoma is pink/red and moist; report a dusky, pale, or black stoma (ischemia). Protect peristomal skin, teach appliance care, and support adaptation (see the ostomy reference).
Monitor anemia & nutrition
Track hemoglobin (chronic occult blood loss), support nutrition, and watch for obstruction. Trend CEA as a treatment/recurrence marker.
Support treatment
Provide chemotherapy side-effect care (e.g., oxaliplatin neuropathy/cold sensitivity, diarrhea), neutropenic precautions, and skin care for pelvic radiation.
Therapeutic Communication Considerations
Bowel symptoms and an ostomy are embarrassing and body-image-altering for many patients. Be matter-of-fact and reassuring, protect privacy and dignity, and normalize their concerns about odor, leakage, sexuality, and returning to normal activities. Involve a wound-ostomy-continence (WOC) nurse and ostomy support groups. Encourage screening conversations with family given the hereditary risk.
Patient & Family Education
Stress screening starting at age 45 (earlier with family history/IBD) and reporting warning signs — change in bowel habits, rectal bleeding, unexplained anemia or weight loss. Teach a high-fiber diet, limiting red/processed meat and alcohol, not smoking, and staying active. Provide thorough ostomy self-care teaching, signs of stoma problems, and follow-up surveillance (colonoscopy and CEA).
NCLEX Pearls
- ✦Colonoscopy is the gold-standard screening AND prevention — it removes polyps before they become cancer (start at 45).
- ✦Right-sided = occult bleeding + iron-deficiency anemia/fatigue; left-sided/rectal = change in bowel habits, pencil stools, visible bleeding, obstruction.
- ✦Unexplained iron-deficiency anemia in an older adult = colorectal cancer until proven otherwise.
- ✦CEA is a tumor marker for monitoring treatment/recurrence — NOT a screening test.
- ✦Assess a new stoma: pink/red and moist is healthy; dusky, pale, or black signals ischemia — report it.
- ✦A positive FIT/stool test must be followed by a colonoscopy.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with Oncology Nursing Society (ONS) · National Comprehensive Cancer Network (NCCN) · American Society of Clinical Oncology (ASCO). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →