this video for Rectal and colon diseases and conditions

1. Rectal and Colon Diseases and Conditions
OVERVIEW
Many Americans have difficulty moving their bowels. Many things
contribute to this problem, including diet and activity level. Other causes
are unknown.
This article will describe some of the more common bowel problems.
Anatomyandphysiology
The large bowel consists of the colon (5 feet long) and the rectum (8
inches long). (Many times the rectum is referred to as the opening where
stool emerges, but that is actually the anus.) The rectum is just upstream
from the anus, and the large bowel is connected to the small bowel.
Anatomyof thelargebowel(colon).
The colon's main function is to process the 3 pints of liquid stool it
receives each day into a manageable amount of solid stool, ready for
elimination. The rectum coordinates this process. Normally, a person can
pass up to 200 grams of solid stool daily. However, there is a lot of
variation in the amount of stool a healthy person passes, and can vary
from 3 times a day to 3 times per week.

2. Functional disorders
Functional disorders are conditions in which the bowel looks normal but
doesn't work properly. These are the most common problems affecting the
colon and rectum. The direct cause is frequently unknown.
Constipation
Constipation is defined as small, hard, difficult, or infrequent stools.
Constipation may be caused by:
 Inadequate "roughage" or fiber in the diet
 Not drinking enough fluids
 Poor habits, especially delaying using the toilet
 Movement problems in the large bowel, including slow or
uncoordinated movement
A person who is constipated may strain during a bowel movement, or just
pass very hard stool. Passage of hard stool may lead to anal problems such
as fissures (painful cracks in the anal tissue lining) or hemorrhoids.
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Irritable bowel syndrome (sensitivecolon; spastic colon)
Irritable or sensitive bowel is a condition in which the colon muscle
contracts (tightens) in an abnormal fashion, which may lead to several
problems. Some patients have diarrhea, others have constipation, and
others alternate between constipation and diarrhea. The abnormal
contraction can lead to high pressure that builds up in the colon,
causing abdominal cramps, gas, bloating, and sometimes extreme urgency
(need to go the bathroom).
Treatment includes avoiding foods that make the problems worse,
tailoring diet to the particular symptoms, managing stress, and
medications.
Structural disorders

3. Structural disorders are those in which there is something abnormal that
may need to be removed, altered, or repaired by an operation. These may
include removing a portion of the colon for diverticulitis or for a cancer.
Anal disorders
Internal hemorrhoids
Internal hemorrhoids are normal blood vessels that line the inside of the
anal opening. We are born with them. They are thought to be the fine-
tuning mechanism that allows us to contain gas and avoid passing it until
we it is socially acceptable. When internal hemorrhoids become enlarged
as a result of straining or pregnancy, they may become irritated and start
to bleed. Occasionally, internal hemorrhoids can become large enough to
bulge outside the anal opening.
Hemorrhoids are swollen and inflamed veins around the anus or the lower
rectum.
Traditional care for internal hemorrhoids has included improving bowel
habits, using elastic bands to pull the hemorrhoids back into the rectum, or
removing them surgically. Devices that use sound waves can discover
exactly where the excessive blood flow is occurring into these vessels and
allow the doctor to specifically tie off the area. Another treatment is
the stapled hemorrhoidectomy, in which a special device is used to pull the
hemorrhoid tissue back into the body and staple it in place.

4. External hemorrhoids
External hemorrhoids are veins that lie just under the skin on the outside
of the anus. Usually, they do not cause any symptoms. Occasionally, a
blood clot can form and can be very painful. These are not dangerous
blood clots that can travel to other organs. The biggest concern they raise
is pain. Many times this will get better on its own. Sometimes, the clot is
removed under local anesthesia in the doctor's office.
Anal fissure
An anal fissure is a split or tear in the lining of the anus that occurs after
trauma. This can happen as a result of a hard stool or even diarrhea.
An anal fissure causes bleeding and intense burning pain after bowel
movements. The pain is caused by spasms of the sphincter muscle, which
is exposed to air by this tear. The pain with bowel movements has been
described as the feeling of passing razor blades.
Fissures are the anal problem that is misdiagnosed most commonly. They
are frequently mistaken for hemorrhoids.
Fissures often heal on their own. If they don't improve, your doctor can
recommend an ointment or medication that will relieve the pain. In certain
cases, surgery may be recommended if the tear does not heal because of
excessive sphincter spasm.
An anal fissure is a split or tear in the lining of the anus. A perianal abscess
is a pocket of pus that results from a blocked, infected anal gland.
Perianal abscess
The anal region has tiny glands on the inside of the anus that open and
probably help with the passage of stool. When one of these glands

5. becomes blocked, an infection may develop and there may be an abscess
(a pocket of pus). Treatment includes draining the abscess, usually under
local anesthesia in the doctor's office.
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Fistula-in-ano
In about 50% of cases after a perianal abscess has been drained, a tunnel
develops from the gland on the inside of the anus to the skin around the
anus. This is called a fistula-in-ano. Fistulas drain mucous fluid onto the
skin and blood. They rarely heal on their own and usually need surgery.
Other perianal infections
Hair in the region between the anal area and the tailbone can burrow
under the surface and cause an infection called pilonidal disease. It may
present as abscess in this area just below the tailbone, or as small draining
openings. Usually surgery is needed to treat this problem.
Sexually transmitted diseases that can affect the anus
include herpes, AIDS, chlamydia, and gonorrhea. Anal warts are small
growths on the anal skin that look like tiny pink cauliflowers and are
caused by a virus (HPV).
Colonandrectaldisorders
Diverticular disease
Colonic diverticula are little out-pouchings or sacs in the bowel lining that
occur when the lining gets pushed through weak spots in the muscle of the
bowel wall. They usually appear in the sigmoid colon, where the large
bowel exerts the highest pressure.

6. Colonic diverticula are small out-pouchings or sacs that push through
weak spots in the muscle layers of the colon wall.
Diverticular disease is very common in Western societies and may be due
to low-fiber Western diets. Diverticula rarely cause symptoms unless one
of the sacs gets blocked and infected. This is called diverticulitis and
occurs in about 10% of people with diverticula. There is occasionally
bleeding in this area.
About half the patients who have complications of their diverticula will
need surgery.
Polyps and cancer
Cancer of the colon and rectum is a major health problem in America
today. It occurs when the cells in the lining of the large bowel grow and
divide in an uncontrolled manner. Many factors contribute to this loss of
control, including the environment, our diet, and genetics (what we inherit
from our parents).
The first abnormality in the bowel in colon cancer is a polyp, a small
growth that may look like a mushroom protruding from the lining tissue of
the large bowel. There are many types of polyps, and not all are the type
that turn into cancer. However, removing these polyps before they
develop severe changes and grow can prevent the progression to cancer.

7. Polyps are small abnormal growths that protrude from the tissue lining
the colon or rectum.
When cancer develops, it must be removed by surgery. Chemotherapy may
be recommended for cancer of the colon or rectum. Certain cancers of the
rectum may require radiation treatment.
With prompt, expert treatment, most people can be cured of colorectal
cancer. Although people may worry about having to wear a colostomy bag
on the abdomen to collect stool, very few people need a permanent
colostomy bag.
Because colorectal cancer comes from polyps, a colonoscopy procedure
can prevent colorectal cancer by finding and removing polyps. People at
greater risk for colorectal cancer include those who have had polyps or
cancers in the past, or those who have a family history of colorectal cancer.
Colitis
Colitis is a group of conditions that cause inflammation of the large bowel.

8. Colitis is an inflammation of the inner lining of the colon.
There are several types of colitis, including:
 Infectious colitis (due to an infection that attacks the large bowel)
 Ischemic colitis (caused by not enough blood going to the colon)
 Radiation colitis (after radiation therapy, usually for prostate, rectal,
or gynecological cancer)
 Ulcerative colitis
 Crohn's disease
Colitis causes diarrhea, rectal bleeding, abdominal cramps, and urgency
(increased need to go to the bathroom). Treatment depends on the
diagnosis, which is made by colonoscopy and biopsy (removal of cells or
tissue for examination under a microscope).
Summary
Many diseases of the colon and rectum can be prevented or treated by
seeking prompt medical care. People who have symptoms of any of these
conditions should consult their doctor.

9. Most importantly, colon cancer is a preventable disease. The most
important risk factor is having a direct family member who had colon
cancer. Ask your doctor when you need an evaluation (usually
a colonoscopy) to look for polyps. For people with no family history and
no symptoms, the current recommendation is that everyone should have
their first colonoscopy at age 45.
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