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Jun 20 / Dale Harris

Causes of Diarrhea

In medicine, diarrhea, also spelled diarrhea, refers to frequent loose or liquid bowel movements. Although for many people diarrhea is merely unpleasant, diarrhea that is both acute and severe is a common cause of death in developing countries and a major cause of infant death worldwide. It is often due to gastroenteritis.

Major Causes
Viral infections, parasites or bacterial toxins most commonly cause diarrhea. In sanitary living conditions where there is ample food and a supply of clean water, an otherwise healthy patient usually recovers from viral infections in a few days. However, for ill or malnourished individuals diarrhea can lead to severe dehydration and can become life threatening without treatment.

Diarrhea can also be a symptom of more serious diseases, such as dysentery, Montezuma’s Revenge, cholera, or botulism, and can also be indicative of a chronic syndrome such as Crohn’s disease or severe mushroom poisoning syndromes. Though appendicitis patients do not generally have diarrhea, it is a common symptom of a ruptured appendix. It is also an effect of severe radiation sickness.

Diarrhea can also be caused by dairy intake in those who are lactose intolerant. Symptomatic treatment for diarrhea involves the patient consuming adequate amounts of water to replace that loss, preferably mixed with electrolytes to provide essential salts and some amount of nutrients. For many people, further treatment is unnecessary. The following types of diarrhea indicate medical supervision is required:

  • Diarrhea in infants;
  • Moderate or severe diarrhea in young children;
  • Diarrhea associated with blood;
  • Diarrhea that continues for more than two days;
  • Diarrhea that is associated with more general illness such as on-cramping abdominal pain, fever, weight loss, etc;
  • Diarrhea in travelers, since they are more likely to have exotic infections such as parasites;
  • Diarrhea in food handlers, because of the potential to infect others;
  • Diarrhea in institutions such as hospitals, childcare centers, or geriatric and convalescent homes.

A severity score is used to aid diagnosis in children.


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