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Gastroenteritis is an inflammation of the gastrointestinal tract (the pathway responsible for digestion that includes the mouth, esophagus, stomach, and intestines). Gastroenteritis is also sometimes referred to as stomach flu, even though it may not be related to influenza.
Gastroenteritis can be caused by viral, bacterial, or parasitic infections. Viral gastroenteritis is contagious and is responsible for the majority of outbreaks in developed countries.
Common routes of infection include:
In less developed countries, gastroenteritis is more often spread through contaminated food or water.
The main symptom of gastroenteritis is diarrhea. When the colon (large intestine) becomes infected during gastroenteritis, it loses its ability to retain fluids, which causes the person's feces to become loose or watery. Other symptoms include:
Because of the symptoms of vomiting and diarrhea, people who have gastroenteritis can become dehydrated quickly. It is very important to watch for signs of dehydration, which include:
Because gastroenteritis is so similar to diarrhea, and because so many cases do not require hospitalization, it is difficult to determine how many cases of gastroenteritis occur per year. Worldwide, it is estimated that 3 to 5 billion cases of acute diarrhea (which can be caused by many other diseases besides gastroenteritis) occur per year. Severe gastroenteritis is estimated to cause about 5 to 10 million deaths per year worldwide.
Anyone can get the disease. People who are at a higher risk include:
People with immune systems that are weakened by disease or medications or not fully developed (i.e., infants) are usually affected most severely.
The doctor will take a medical history to make sure that nothing else is causing the symptoms. Also, the doctor might perform a sigmoidoscopy or radiologic examination to exclude the possibilities of inflammatory bowel disease (e.g., Crohn's disease) and pelvic abscesses (pockets of pus). A stool culture (a laboratory test to identify bacteria and other organisms from a sample of feces) can be used to determine the specific virus or germ that is causing gastroenteritis.
Other diseases that could cause diarrhea and vomiting are pneumonia, septicemia (a disease caused by toxic bacteria in the bloodstream), urinary tract infection, and meningitis (an infection that causes inflammation of the membranes of the spinal cord or brain).
Conditions that require surgery, such as appendicitis (an inflammation of the appendix), intussusception (a condition in which the intestine folds into itself, causing blockage) and Hirschsprung's disease (a condition where nerve cells in the intestinal walls do not develop properly) can also cause symptoms similar to gastroenteritis.
The body can usually fight off the disease on its own within a few days. The most important factor when treating gastroenteritis is the replacement of fluids and electrolytes that are lost because of diarrhea and vomiting.
Foods that contain electrolytes and complex carbohydrates, such as potatoes, lean meats (for example, fish, and chicken), and whole grains can help replace nutrients. You can also buy electrolyte and fluid replacement solutions at grocery and drug stores. Or, if hospitalization is required, the nutrients can be replaced intravenously (injected directly into the veins).
Antibiotics will not be effective if the cause of gastroenteritis is a viral infection. Doctors usually do not recommend antidiarrheal medications for gastroenteritis because they tend to prolong infection, especially in children.
There are several steps that you can take to reduce your risk of getting gastroenteritis, including:
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This information is provided by Cleveland Clinic Abu Dhabi, part of Mubadala Healthcare, and is not intended to replace the medical advice of your doctor or health care provider. Please consult your health care provider for advice about a specific medical condition.
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