Understanding Rectal Bleeding
Rectal bleeding is a surprisingly common complaint, and the way it presents can vary. Some people notice blood mixed with stool, others see blood in the toilet bowl or on the toilet paper after wiping. When the blood is bright red, it usually originates from the anus or rectum, which is the final portion of the large intestine just before the anus.
Many benign and malignant conditions of the colon, rectum, and anus can cause rectal bleeding. However, there is one critical point that must be emphasized: in any patient presenting with rectal bleeding, malignant diseases of the colon, rectum, or anus must be ruled out.
Why Benign Findings Are Not Enough
Finding a benign condition such as hemorrhoids during examination is not sufficient to eliminate the suspicion of cancer. Benign anorectal conditions are extremely common in the general population, and their presence does not guarantee that the bleeding is harmless. It is not uncommon for a patient with rectal bleeding to be found to have visible hemorrhoids, while the actual source of the bleeding is a tumor located higher in the rectum. Unfortunately, this scenario sometimes leads to delayed diagnosis, with patients treated with hemorrhoid creams for months before the true cause is identified.
How Cancer Is Ruled Out
The standard approach to evaluating rectal bleeding involves a digital rectal examination and endoscopic evaluation. The extent of the endoscopic examination depends on the patient’s age and individual risk factors.
For individuals under the age of 45 who have no known risk factors for colorectal cancer and are found to have a benign condition that could explain the bleeding, it may be sufficient to perform a limited endoscopic examination of the rectum and anus. This is called a rectoscopy.
For patients over 45 or those with risk factors such as a family history of colorectal cancer, a complete colonoscopy is usually recommended. Colonoscopy allows the doctor to visualize the entire colon and remove any polyps that could become cancerous in the future.
When to See a Doctor
Any episode of rectal bleeding deserves a thorough evaluation, regardless of how minor it seems. The color of the blood, the amount, and whether it is accompanied by pain or changes in bowel habits all provide important clues, but none of these factors can rule out a serious cause on their own.
If you are experiencing rectal bleeding, contact our team to schedule an evaluation. For more information about colorectal health and screening, see our guide on colorectal cancer prevention.
