Common Causes and Prevention of Diarrhea

July. 16,2025

This article explores the primary causes of diarrhea, including bacterial, viral, traveler-related, and chronic factors. It offers practical prevention tips, emphasizing hygiene, proper food handling, and awareness of underlying health conditions. Understanding these causes can help reduce risk and promote better digestive health, especially during travel or when using medications. Staying vigilant about food safety and hygiene practices is essential for avoiding episodes and maintaining overall wellness.

Common Causes and Prevention of Diarrhea

Understanding the Main Reasons Behind Diarrhea

Diarrhea, though unpleasant and disruptive, is a widespread issue affecting millions worldwide. In the US, adults typically experience episodes at least four times annually, while children under five may face up to fifteen occurrences. Various factors such as stress, medications, and everyday foods can trigger diarrhea. Sometimes, it indicates an underlying health issue. Causes vary widely, and anyone can be affected at any time.

What Are the Key Causes?

Common Causes of Diarrhea

Bacterial Factors
Gut bacteria coexist with us in complex ways, with some beneficial and others harmful. Pathogenic bacteria can contaminate food like raw meats, unpasteurized dairy, and shellfish, especially if improperly stored or cooked. To prevent bacterial diarrhea, ensure meats and eggs are thoroughly cooked and all surfaces and utensils are sanitized. Refrigerate leftovers promptly and avoid leaving food at room temperature for extended periods.
Checking health department ratings for restaurants before dining can help ensure hygiene standards are maintained. Good food safety practices help reduce the risk of diarrhea and promote better health.
Viral Causes
Viral infections are another leading cause of diarrhea, especially since many strains are highly contagious. These viruses can spread through sharing utensils, contaminated food or drinks, or contact with infected individuals—even those without symptoms. Maintaining proper hygiene and cleanliness in food preparation areas is critical. Avoid cross-contamination by using separate utensils and washing hands regularly. Since viral and bacterial diarrhea show similar symptoms, it's vital to practice caution to avoid infection.
Travel-Related Diarrhea
Known as Montezuma’s Revenge or Delhi Belly, traveler's diarrhea affects many tourists due to contaminated water and food sources abroad. Raw or unwashed produce, untreated tap water, and food prepared in unsanitary conditions are common culprits. Using bottled water and eating only thoroughly cooked foods can reduce risk. Symptoms usually resolve within 12 hours, but attention to local sanitation standards is essential.
Chronic Diarrhea
Persistent or recurring diarrhea might signal an underlying health condition. Causes include side effects from antibiotics and other medications, food intolerances, or digestive disorders like irritable bowel syndrome (IBS). Conditions like celiac disease involve gluten intolerance, leading to ongoing diarrhea due to immune reactions. Consulting a healthcare professional is crucial if diarrhea persists, to identify and treat the underlying cause effectively.