Usually, diarrhea is caused by a virus that infects the gut. Some people call it "intestinal flu" or "stomach flu."
It can also happen due to:
- Alcohol abuse
- Allergies to certain foods
- Diabetes
- Diseases of the intestines (such as Crohn's disease or ulcerative colitis)
- Eating foods that upset the digestive system
- Infection by bacteria (the cause of most types of food poisoning) or other organisms
- Laxative abuse
- Medications
- Overactive thyroid (hyperthyroidism)
- Radiation therapy
- Running (Some people get “runner’s diarrhea”)
- Some cancers
- Surgery on your digestive system
- Trouble absorbing some nutrients (Doctors call this “malabsorption.”)
Diarrhea may also follow constipation, especially for people who have irritable bowel
syndrome.
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