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Colonic Diseases
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Digestive System

Colonic Diseases

The colon, or large intestine, is essential for digestion, yet a variety of disorders—from colorectal cancer to irritable bowel syndrome—can disrupt its function, requiring individualized treatment approaches.

Overview

The colon, also known as the large intestine, is a long, hollow tube at the end of the digestive tract where the body forms and stores stool. Disorders of the colon can impair its ability to work properly.

Common Colonic Disorders

  • Colorectal cancer
  • Colonic polyps – extra tissue growing in the colon that can become cancerous
  • Ulcerative colitis – ulcers of the colon and rectum
  • Diverticulitis – inflammation or infection of pouches in the colon
  • Irritable bowel syndrome – an uncomfortable condition causing abdominal cramping and other symptoms

Treatment & Management

Treatment for colonic diseases varies greatly depending on the specific condition and its severity. Options may include dietary modifications, medications, and, in some cases, surgery.

Frequently Asked Questions

Irritable bowel syndrome is a functional disorder that causes pain, cramping, gas, diarrhea, or constipation without causing visible damage or inflammation to the digestive tract. In contrast, inflammatory bowel diseases like ulcerative colitis or Crohn disease cause chronic, visible inflammation, ulcers, and structural damage to the intestinal lining, which can be seen on an endoscopy or tissue biopsy.
While a high-fiber diet is recommended to prevent diverticular disease and maintain general colon health, during an acute diverticulitis flare-up, doctors typically recommend a temporary clear liquid or low-fiber diet to rest the bowel and reduce inflammation. Fiber is gradually reintroduced once pain and infection resolve.
Seek medical attention promptly if you experience rectal bleeding or blood in your stool, unexplained weight loss, persistent changes in bowel habits lasting more than a few weeks, unexplained iron deficiency anemia, severe abdominal cramping, or the feeling that your bowel never completely empties.
Major medical guidelines recommend that average-risk adults begin routine colorectal cancer screening at age 45. Those with a first-degree relative who had colorectal cancer or advanced polyps, or individuals with chronic inflammatory bowel disease, often need to begin screening at age 40 or 10 years earlier than the youngest affected family member's diagnosis.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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