Diarrhea can occur as a symptom of several conditions or circumstances. Some potential causes of diarrhea include:
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Viral infections, including rotavirus and viral gastroenteritis (stomach flu)
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Bacterial infections, including Salmonella and E. coli infection
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Parasitic infections, including Cryptosporidium enteritis
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Digestive tract problems, such as irritable bowel syndrome (IBS)
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Food sensitivities and allergies
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Adverse reactions to medications
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Taking antibiotics (antibiotic-associated diarrhea)
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Gallbladder or stomach surgery
Rotavirus is the most common cause of acute diarrhea worldwide. In the United States, most people develop diarrhea due to food poisoning from eating contaminated foods, according to the CDC.