Yes you can but with a huge risk.
Seeing blood in the toilet, on the outside of your stool, or with wiping after a bowel movement is common. Fortunately, most of the causes of such rectal bleeding are not life-threatening; common causes include hemorrhoids and anal fissures. However, the only way to be certain of the cause is to be evaluated by a healthcare provider.
WHEN TO SEEK HELP — Most people with minor rectal bleeding do not have colon cancer or another serious condition. However, it is not possible to know the cause of rectal bleeding without an examination. Thus, ANYONE who notices rectal bleeding should talk to their healthcare provider to determine if an examination is needed.
RECTAL BLEEDING CAUSES — Seeing a small amount of blood after wiping, on the outside of your stool, or in the toilet is most commonly caused by hemorrhoids or an anal fissure.
Hemorrhoids — Hemorrhoids are swollen blood vessels in the rectum or anus that can be painful, itchy, and can sometimes bleed. Painless rectal bleeding with a bowel movement is a common symptom of hemorrhoids. Bright red blood typically coats the stool or blood may drip into the toilet or stain toilet paper.
Anal fissure — An anal fissure is a tear in the lining of the anus, the opening where feces are excreted. Anal fissures can cause bleeding and a sensation of tearing, ripping, or burning during or after a bowel movement.
Other causes of rectal bleeding — There are many other causes of rectal bleeding, including colon cancer, colon polyps, colitis, and diverticulosis.
In addition, bleeding from higher in the digestive tract, such as the stomach, can produce black, tarry bowel movements because stomach acid turns blood black. Bismuth (such as in Pepto Bismol) and iron supplements can also make the stool appear black. Passing blood from the rectum that is dark red or includes clots usually indicates bleeding from higher in the colon than anal fissures or hemorrhoids would produce.
RECTAL BLEEDING TESTS — The best test for rectal bleeding depends upon your age, symptoms, and past medical history.
Rectal examination — Sometimes a clinician can detect the cause of rectal bleeding with a rectal examination. In younger people, this examination may be all that is necessary.
Anoscopy — Anoscopy allows a clinician to inspect the anus and lower rectum. It can be done in the office and does not require sedation.
Sigmoidoscopy — During a sigmoidoscopy, a clinician can examine the rectum and most of the lower large intestine Sigmoidoscopy can be done without sedation.
Colonoscopy — A colonoscopy is a procedure in which a physician examines the entire colon, usually while the patient is sedated.
WHY SHOULD I WORRY ABOUT RECTAL BLEEDING? — While most rectal bleeding is caused by the non-serious causes mentioned above, bleeding can also be caused by cancerous or precancerous conditions. Precancerous polyps near the end of the colon can mimic bleeding from hemorrhoids. These are generally present in the colon for years before they become cancerous, and they can be removed very safely from the colon, preventing progression to cancer.
Colon cancer may be diagnosed in patients who have ignored bleeding for years because they assumed it was from hemorrhoids. Polyps and colon cancer become more common with aging, and thus investigation of bleeding is most important, and is usually most intensive, in patients over the age of approximately 40 to 50 years.