What Causes Diarrhea?

What Causes Diarrhea?

Quick Answer: The most common causes of diarrhea are infections (viruses, bacteria, parasites), food intolerance (like lactose), certain medications, and digestive conditions. Most cases are short-term and clear up on their own.

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Diarrhea happens when your body moves food through the digestive tract too quickly, or can’t absorb enough fluid. Here are the main culprits:

  • Viral infections: Stomach bugs (like norovirus or rotavirus) often spread quickly and usually last a few days.
  • Bacterial infections: Food poisoning from contaminated food or water is a common trigger.
  • Food intolerances: Lactose, artificial sweeteners, or greasy foods can upset digestion.
  • Medications: Antibiotics and some blood pressure or cancer drugs may cause diarrhea as a side effect.
  • Digestive conditions: IBS, Crohn’s disease, or celiac disease can lead to recurring diarrhea.
  • Other causes: Stress, travel (traveler’s diarrhea), or contaminated water.

When to see a doctor: If diarrhea lasts more than a few days, is very severe, or is accompanied by high fever, blood, or dehydration symptoms.

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