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What is Digestive System?
The digestive system is responsible for receiving food, breaking
it down in to nutrients, absorbing the nutrients into the bloodstream,
and eliminating the undigestible parts of food from the body. The
digestive tract consists of the mouth, throat, esophagus, stomach,
small intestine, large intestine, rectum and anus. The digestive
system also includes the pancreas, the liver and the gallbladder.
Crohn’s Disease
Crohn’s Disease (regional enteritis, granulomatous iletitis, ileocolitis)
is a chronic inflamattion of the intestinal wall that may affect
any part of the digestive tract. Most commonly Crohn's Disease occurs
in the last portion of the small intestine and in the large intestine.
The cause of Crohn’s Disease is not known. Researches believe that
a dysfunction of the immune system results in the intestine overreacting
to an environmental, dietary, or infectious agent. Certain people
may have hereditary predisposition to this immune system dysfunction.
Cigarette smoking appears to contribute to both the development
and the periodic flare-ups of Crohn's Disease. Most commonly Crohn's
Disease occurs in the last portion of the small intestine and in
the large intestine.
Ulcerative colitis
Ulcerative colitis is a chronic disease in which the large intestine
becomes inflamed and ulcerated (pitted or eroded), leading to flare-ups
(bouts or attacks) of bloody diarrhea, abdominal cramps, and fever.
The long-term risk of colon cancer is increased.
Ulcerative colitis usually does not affect the full thickness of
the wall of the large intestine and rare affects the small intestine.
The disease usually begins in the rectum or the rectum and the sigmoid
colon (the lower end of the large intestine) but may eventually
spread along part or all of the large intestine.
Ulcerative colitis may start at any age but usually begins between
the ages of 15 and 30. A small group of people have their first
attack between the ages of 50 and 70.
The cause of ulcerative colitis is not known for certain, but heredity
and an overactive immune response in the intestine seem to be contributing
factors. Cigarette smoking seems to decrease the risk of ulcerative
colitis. However, smoking in order to reduce the risk of ulcerative
colitis is ill-advised in light of the many health problems that
smoking can cause.
Constipation
Constipation is a condition in which a person has uncomfortable
or infrequent bowel movements.
Constipation may be acute or chronic. Acute constipation begins
suddenly and conspicuously. Chronic constipation may begin insidiously
and persist for months or years.
Causes:
- Slowed transit of stool
- Dehydration and low-fiber diet
- Obstruction
- Dyschezia
- Aging
- Pain and psychogenic factors
Diarrhea
Diarrhea is an increase in the volume, wateriness, or frequency
of bowel movements.
The frequency of bowel movements alone is not the defining feature
of diarrhea. Some people normally move their bowels 3 to 5 times
a day. People who eat large amounts of vegetable fiber may produce
more than a pound of stool a day, but the stool in such cases is
well formed and not watery. Diarrhea occurs when not enough water
is removed from the stool, making the stool loose and poorly formed.
Diarrhea is often associated with gas, cramping, an urgency to move
the bowels (defecate), nausea, and vomiting.
Causes:
- Rapid transit of stool
- Retention of water in the stool (osmotic diarrhea)
- Secretion of water Into the stool
- Certain medications
- Infection with viruses, bacteria, or parasites
- Components of food
- Stress
- Chemicals
- Chronic disorders such as irritable bowel syndrome and inflammatory
bowel disease
Irritable Bowel Syndrome (IBS)
Irritable bowel syndrome is a disorder of motility of the entire
digestive tract that causes abdominal pain, constipation, or diarrhea.
In this disorder, the digestive tract is especially sensitive to
many stimuli. Stress, diet, drugs, hormones, or minor irritants
may cause the digestive tract to contract abnormally, usually leading
to diarrhea. Periods of constipation may occur between bouts of
diarrhea. Irritable bowel syndrome affects women 3 times more often
than men.
Triggers:
- Alcohol
- Anxiety
- Caffeine
- Carbonated drinks
- Chocolate
- Depression
- Emotional stress
- Fatty foods
- Frustration
- Large meal
- Menstruation
- Milk products
- Wheat gluten
Gastroesophageal Reflux (GERD)
In gastroesophageal reflux (gastroesophageal reflux disease, GERD),
stomach acid and enzymes flow backward from the stomach into the
esophagus, causing inflammation and pain in the esophagus.
The stomach lining protects the stomach from the effects of its
own acid. Because the esophagus lacks a similar protective lining,
stomach acid and enzymes that flow backward (reflux) into the esophagus
routinely cause symptoms and in some cases damage.
If GERD is not treated, it can cause permanent damage to the esophagus.
Acid and enzymes reflux when the lower esophageal sphincter, the
ring-shaped muscle that normally prevents the contents of the stomach
from flowing back into the esophagus, is not functioning properly.
When a person is standing or sitting, gravity helps to prevent the
reflux of stomach contents into the esophagus, which explains why
reflux can worsen when a person is lying down. Reflux is also more
likely to occur soon after meals, when the volume and acidity of
contents in the stomach are higher and the sphincter is less likely
to work properly. Factors contributing to reflux include weight
gain, fatty foods, chocolate, caffeinated and carbonated beverages,
alcohol, tobacco smoking, and certain drugs.
Peptic Ulcer
A peptic ulcer is a round or oval sore where the lining of the
stomach or duodenum has been eaten away by stomach acid and digestive
juices.
Ulcers penetrate into the lining of the stomach or duodenum (the
first part of the small intestine). Gastritis may develop into ulcers.
Ulcers develop when the normal defense and repair mechanisms of
the lining of the stomach or duodenum are weakened, making the lining
more likely to be damaged by stomach acid. By far, the two most
common causes of peptic ulcer are infection of the stomach with
Helicobacter pylori bacteria and use of certain drugs. Before current
treatments for H. pylori infection were used, these bacteria were
present in nearly 90% of people with duodenal ulcers and in 75%
of people with stomach ulcers. Currently, the percentage is lower,
about 50 to 75%.
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