What Causes Diarrhea?
The most common cause of diarrhea is a virus that infects the gut. The
infection usually lasts for two days and is sometimes called "intestinal flu"
or "stomach flu." Diarrhea may also be caused by:
- Infection by bacteria (the cause of most types of food poisoning)
- Infections by other organisms
- Eating foods that upset the digestive system
- Allergies to certain foods
- Medications
- Radiation therapy
- Diseases of the intestines (Crohn's disease, ulcerative colitis)
- Malabsorption (where the body is unable to adequately absorb certain
nutrients from the diet)
- Hyperthyroidism
- Some cancers
- Laxative abuse
- Alcohol abuse
- Digestive tract surgery
- Diabetes
- Competitive running
Diarrhea may also follow constipation, especially for people who have
irritable bowel syndrome.
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