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If a
cancer in the colon is causing symptoms, it probably already has
been present for some time, since very small cancers usually
don’t cause any problems. And so, we really want to find
these cancers before they cause symptoms. This means that
we must look for polyps and cancers in people who have no
evidence of cancer. We try to focus on those who at least
statistically are more likely to develop colon or rectal
cancer. This is the reason we recommend colonoscopy for
patients once they turn 50, because these cancers are more
common as you get older. For African Americans, screening is
recommended to begin at age 45 or even earlier, because the
incidence is higher. And if you have a family history of
cancer, screening should begin earlier.
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Cancer Home Page
Even
though screening is our primary recommendation for diagnosing
colorectal cancer, there are going to be patients who have
symptoms before a cancer is found. If you have any of these
symptoms, it does not necessarily mean you have colon cancer,
but you almost certainly should be checked for this possibility.

There can
be a change in your usual bowel habits. If you typically
have bowel movements “like clockwork” every morning, or twice a
day, or every other day, and then you start having more or less
frequent bowel movements, perhaps sometimes diarrhea and
sometimes hard, or if you notice that the stools start coming
out real “thin”, like the thickness of pencil, or if you just
become more constipated, these symptoms should be evaluated,
since sometimes they occur because of a cancer.
Rectal
bleeding should always be taken seriously
to determine the cause. Bleeding might be noted simply as some
blood on the toilet paper when you wipe after a bowel movement.
It might be noted as a pinkish tinge to the water in the toilet
bowl after a bowel movement. You might notice blooding dripping
from your rectum near the end of bowel movement. You might
notice blood clots mixed in with the stool, or what looks like
streaks of blood on the surface of the stools. Blood that has
come from higher up in the intestinal tract may be altered, so
that it looks maroon, or even black (this is called melena).
In any of these cases, you should contact your doctor to
determine the source of the blood. There are a number of
different possible explanations, including hemorrhoids, anal
fissures, benign polyps, diverticulosis, ulcers, inflammatory
disease of the intestines, malformations of the vessels in the
bowel, or various types of cancer.
The other
signs and symptoms listed are less specific for the possibility
of colon cancer, such as abdominal pain, weakness and fatigue,
or unexplained weight loss. But such symptoms should be
discussed promptly with your doctor to determine the cause.
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Suggested next pages
Etiology
of Colon Cancer
Diagnosis of Colon Cancer
Treatment of Colon
Cancer
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Cancer Home Page
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