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Gastrointestinal Bleeding

Gastrointestinal Bleeding

Alternate Names

  • GI bleeding
  • bleeding in the gut
  • gastrointestinal hemorrhage
  • Digestive system


Gastrointestinal (GI) bleeding describes any blood loss that occurs through the digestive tract.

What is going on in the body?

The GI (digestive) tract is a passage that leads from the mouth to the anus. This tract includes the:
  • esophagus, a tube that connects the mouth to the stomach
  • stomach
  • intestines (the small intestine and the large intestine - the colon)
Bleeding can occur anywhere in the GI tract for any of a number of reasons.


What are the causes and risks of the condition?

There are many possible causes of this condition, including:
  • peptic ulcer, which may occur in the stomach or small intestine
  • gastritis, or inflammation of the lining of the stomach. This often occurs in those who have been using aspirin or pain medications called nonsteroidal anti-inflammatory drugs (NSAIDs). Gastritis is also common in a person who is a heavy alcohol drinker. enlarged veins in the esophagus called esophageal varices, which are prone to rupturing. This condition is usually seen as a part of alcoholic liver disease.
  • a Mallory-Weiss tear, which is a small tear in the inside lining of the esophagus, usually due to severe retching or vomiting
  • diverticulosis, a condition that causes outpouchings of the walls of the colon
  • certain bacterial or parasitic infections in the gut that can invade the bowel wall and cause bloody diarrhea. These are more common in the developing world.
  • diverticulitis, an infection of the outpouchings of the colon that occur in diverticulosis
  • small growths in the bowel, usually not malignant, known as polyps. These can be numerous especially in people with a family history of polyps.
  • malignant tumors such as colon cancer, stomach cancer, or esophageal cancer
  • inflammatory bowel disease, a group of conditions causing inflammation in the bowels for reasons that are not well understood (such as Crohn's Disease and Ulcerative Colitis)
  • hemorrhoids, which are enlarged veins around the anus
  • abnormal blood vessels in the digestive tract, which may rupture
  • inflammation of the colon from a lack of blood flow, or from radiation therapy
Other causes are also possible. Sometimes, no cause can be found.


What can be done to prevent the condition?

Avoidance of alcohol, aspirin, and NSAIDs can prevent cases due to these causes. Many cases cannot be prevented.


How is the condition diagnosed?

Bleeding in the GI tract may be discovered with a routine test of the stool for blood that is often part of a complete physical exam. In other cases, a person complains of blood in the stool. In some cases, the history and physical exam are all that is needed to determine the cause, such as with visible hemorrhoids.
In most cases, further testing is needed, and may include:
  • a CBC, or complete blood count
  • endoscopy to locate the source of bleeding. This is a procedure that uses a thin tube with a light and camera on the end of it. The tube can be inserted into the mouth or anus and advanced into the GI tract. The camera on the end of the tube allows the provider to see the inside lining of the GI tract.
  • special x-ray tests or additional tests to detect bleeding

Long Term Effects

What are the long-term effects of the condition?

Heavy, rapid bleeding can result in shock or death. Most long-term effects are related to the cause of GI bleeding. For example, hemorrhoids may be painful, but rarely cause serious long-term effects. Cancer can cause death.

Other Risks

What are the risks to others?

GI bleeding is not contagious. In cases due to infections, the infection is sometimes contagious.


What are the treatments for the condition?

Those with heavy bleeding may need blood transfusions. Fluids may be given through a an intravenous line, which is a thin tube inserted into a person's vein. Further treatment is often directed at the cause, if it can be determined. For example, those with:
  • ulcers may need medications to reduce stomach acid, such as ranitidine or omeprazole
  • cancer may need surgery, chemotherapy, or radiation therapy
  • an infection may need antibiotics

Side Effects

What are the side effects of the treatments?

Side effects depend on the treatments used:
  • Blood transfusions may cause allergic reactions or infections.
  • Antibiotics may cause allergic reactions and stomach upset.
  • Surgery carries a risk of infection and bleeding.

After Treatment

What happens after treatment for the condition?

Some people may die even with treatment if the bleeding is heavy and cannot be stopped. This is not uncommon in those with bleeding from esophageal varices. Some people are able to return to normal activities right away, such as most people with hemorrhoids.


How is the condition monitored?

Periodic CBC may be done to make sure the blood counts are stable. Many people with bleeding are briefly monitored for further bleeding in the hospital. Other monitoring is usually related to the cause. For example, those with a stomach ulcer may need a repeat endoscopy procedure in the future to make sure the ulcer is healing properly.


The Merck Manual, 1995, Berkow et al.

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