What Causes Diarrhea?

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.”)

[url=http://www.webmd.com/digestive-disorders/digestive-diseases-diarrhea]http://www.webmd.com/digestive-disorders/digestive-diseases-diarrhea[/url]