Colorectal cancer: a largely preventable disease
Colorectal cancer develops from abnormal growths called polyps on the inner lining of the large intestine. Because most polyps grow slowly and remain asymptomatic for years, routine screening is considered the most reliable way to catch them before cancerous changes occur. Colonoscopy is currently the standard procedure for both detection and removal.
Why polyps form: age, diet, genetics and gut bacteria
Age remains a primary risk factor for colon polyps, though younger adults are increasingly being diagnosed. A diet high in processed meat and animal fat but low in fiber is associated with elevated risk, as are chronic inflammatory bowel diseases such as ulcerative colitis and Crohn’s disease.
Genetics also play a significant role. Inherited conditions like familial adenomatous polyposis (FAP) can dramatically increase susceptibility. Researchers also suggest that an imbalance in gut bacteria may contribute to chronic inflammation and abnormal tissue growth in the colon lining.
The four warning signs to watch for during bowel movements
Rectal bleeding is one of the most common signals. Bright red blood may appear on toilet paper or in the bowl; some bleeding is only detectable through stool testing. Although hemorrhoids are a frequent cause, persistent or unexplained rectal bleeding should always be medically assessed.
Tissue protruding from the anus during a bowel movement — often appearing as soft, reddish tissue that may retract afterward — can indicate a polyp near the rectum. Only a medical examination can determine the exact cause, and this symptom should never be ignored.
Persistent changes in bowel habits — including long-lasting diarrhea, constipation, frequent urgency, or alternating episodes of both — may suggest that larger polyps are interfering with normal bowel function. If such changes persist for several weeks without a clear explanation, medical evaluation is recommended.
Abdominal pain or cramping can occur when larger polyps partially block the intestine or become irritated during bowel contractions. Pain that continues or worsens over time warrants prompt attention from a healthcare professional.
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