Colon polyp

Disease Description (Causes and Symptoms)

• Definition summary: A colon polyp is a growth (benign tumor) that develops in the colonic mucosa, and adenomatous polyps account for the majority. Polyps vary in shape (pedunculated, sessile, flat, etc.) and size.
• Causes and pathophysiology: Polyps form as colonic mucosal cells proliferate abnormally due to gene mutations, and some adenomas gradually progress from dysplasia to cancer (adenoma–carcinoma sequence). Risk factors include a high-fat, high-meat diet, insufficient fiber intake, excessive alcohol consumption and smoking, family history (including hereditary polyposis), and increasing age.
• Main symptoms: Most are asymptomatic and are discovered incidentally during endoscopic examinations. When symptoms occur, they may include hematochezia or occult blood (traces of blood in the stool), mucus in the stool, abdominal pain, diarrhea or constipation, and symptoms of intestinal obstruction if the polyp is very large.
• Progression speed (general reference): Most polyps grow over several years, and progression to cancer usually takes several years (generally several years to 5–10 years). Some studies report that some adenomas may progress relatively quickly (within several years, e.g., 3–5 years).

Treatment Methods

• Basic principles: Detected polyps are removed (resected) whenever possible. Histopathological features are confirmed through biopsy to determine additional treatment and the interval for follow-up monitoring.
• Endoscopic treatment: Most polyps are removed during colonoscopy by electrocautery polypectomy using a snare, forceps, or similar instruments. Flat or large polyps may require endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD).
• Surgical treatment: Open or laparoscopic resection may be considered when complete removal by endoscopy is not possible, invasive cancer is suspected on biopsy, cancer remains at the resection margin, or extensive polyposis (multiple polyps) or hereditary polyposis is suspected.
• Medication/preventive approaches: There is evidence that aspirin or some medications may lower the risk of colorectal cancer, but they are not recommended for all patients. The decision should be made in consultation with the treating physician based on the individual’s risk.
• Lifestyle management: Limit red meat, processed meat, and fat intake; increase dietary fiber intake (such as grains, fruit, vegetables, and seaweed); stop smoking and limit alcohol consumption; and exercise regularly. Adequate fluid intake is recommended when increasing fiber intake.
• Precautions: Complications such as bleeding and perforation may occur after polyp removal (the risk increases especially when taking anticoagulants). Additional treatment or follow-up examinations at short intervals may be needed depending on the pathology results after removal.

Checklist Before an Outpatient Visit (Including Items to Bring and Example Questions)

• Recommended items to bring
  • A list of all medications currently being taken (especially anticoagulants, antiplatelet agents, NSAIDs, etc.), including supplements and herbal medicines
  • Previous colonoscopy findings and biopsy results (copies, if available)
  • A record of family history (whether immediate family members have had colorectal cancer or multiple polyposis)
  • A record of changes in symptoms (frequency of bleeding, stool form, frequency and color, weight changes, abdominal pain, etc.)
  • Allergies and history of previous surgery or anesthesia
• Check in advance at the outpatient visit
  • Recent fecal occult blood test results, if available
  • Recent abdominal imaging results (CT, CT colonography, etc.), if available; bring them if possible
• Example questions (items for the patient to write down)
  • "Have you had blood mixed in your stool during the past several months? How often did it occur?"
  • "Does anyone in your family have a history of colorectal cancer or multiple polyposis?"
  • "Are you currently taking an anticoagulant (e.g., warfarin or a NOAC), aspirin, or clopidogrel?"

General Example Questions to Ask the Doctor

• "What are the pathological findings of my polyp (type, size, histologic formation, and degree of dysplasia)?"
• "Was my polyp completely removed? Is there anything abnormal at the resection margin (a need for additional resection)?"
• "What follow-up colonoscopy interval is recommended in my case?"
• "What should I do if complications such as bleeding or perforation occur after polyp removal?"
• "Are there any particular points I should be careful about regarding diet, exercise, or medications?"

Examples of Disease-Specific Customized Questions

• "Based on the number and size of my polyps and the pathology (e.g., tubular adenoma, villous features, high-grade dysplasia, etc.), what is the personalized interval for my follow-up examinations?"
• "Given my family history or finding of multiple polyps, do you recommend genetic testing or additional examinations to determine whether I have hereditary polyposis (e.g., familial adenomatous polyposis or Lynch syndrome)?"

(Note: The interval for follow-up monitoring and treatment choices vary depending on the number, size, and histologic type of the polyps, completeness of resection, and individual risk factors. The final decision is made with the treating specialist based on the pathology results.)