When is diarrhea a sign of something serious?

Diarrhea that lasts more than a few days, contains blood or mucus, is accompanied by high fever, or causes signs of severe dehydration may indicate a serious underlying condition. Chronic diarrhea lasting more than 4 weeks could be a sign of inflammatory bowel disease, celiac disease, or irritable bowel syndrome. Seeking medical evaluation is important when diarrhea is persistent or severe.

Should I take anti-diarrheal medication?

Over-the-counter anti-diarrheal medications like loperamide can help manage symptoms in adults with mild, non-infectious diarrhea. However, they should be avoided if you have a high fever, bloody stools, or a suspected bacterial infection, as slowing digestion could worsen the condition. Always consult a healthcare provider before using anti-diarrheal medications in children.

What is the best diet when you have diarrhea?

The BRAT diet (bananas, rice, applesauce, and toast) is commonly recommended during acute diarrhea as these bland, low-fiber foods are easy to digest and can help firm stools. It is also important to stay well-hydrated with water, clear broths, and oral rehydration solutions. As symptoms improve, gradually reintroduce normal foods while avoiding dairy, caffeine, fatty foods, and alcohol.

DigestiveICD-10: K59.1Causes approximately 179 million cases of acute illness in the U.S. annually

Diarrhea

Also known as: Loose Stools, Runny Stomach, The Runs, Acute Gastroenteritis

Diarrhea is characterized by loose, watery stools occurring three or more times per day, and is one of the most common health complaints worldwide. It can be acute (lasting less than 2 weeks), persistent (2-4 weeks), or chronic (lasting more than 4 weeks), with causes ranging from viral infections to chronic digestive disorders. While most cases resolve on their own, severe or prolonged diarrhea can lead to dangerous dehydration, particularly in young children and older adults.

At a Glance

Common symptoms: Loose, watery stools three or more times daily, Abdominal cramps and pain, Bloating and gas
Main treatments: Oral rehydration solutions (ORS) to replace lost fluids and electrolytes, Anti-diarrheal medications (loperamide) for symptom relief in non-infectious cases, Antibiotics for confirmed bacterial infections
Category: Digestive · Causes approximately 179 million cases of acute illness in the U.S. annually
See a doctor if: Diarrhea lasts more than 2 days in adults or 24 hours in children

Symptoms

Loose, watery stools three or more times daily

Abdominal cramps and pain

Bloating and gas

Urgency to have a bowel movement

Nausea and sometimes vomiting

Fever (if caused by infection)

Blood or mucus in the stool (in some cases)

Signs of dehydration: thirst, dry mouth, decreased urine output

Causes

Viral infections (norovirus, rotavirus, adenovirus)
Bacterial infections (Salmonella, E. coli, Campylobacter, C. difficile)
Parasitic infections (Giardia, Cryptosporidium)
Food intolerances such as lactose or fructose intolerance
Inflammatory bowel disease (Crohn's disease, ulcerative colitis)
Medications, especially antibiotics

Risk Factors

Travel to developing countries (traveler's diarrhea)
Consuming contaminated food or water
Weakened immune system
Recent antibiotic use disrupting gut microbiome
Living in areas with poor sanitation
Close contact with infected individuals in daycares or nursing homes

Diagnosis

Stool sample analysis for bacteria, viruses, and parasites
Blood tests to identify infection or dehydration markers
Colonoscopy or sigmoidoscopy for chronic diarrhea evaluation
Hydrogen breath test for lactose or fructose intolerance

Treatment

Oral rehydration solutions (ORS) to replace lost fluids and electrolytes
Anti-diarrheal medications (loperamide) for symptom relief in non-infectious cases
Antibiotics for confirmed bacterial infections
Probiotics to restore healthy gut bacteria
Dietary modifications: BRAT diet (bananas, rice, applesauce, toast) during recovery
Intravenous fluids for severe dehydration

Prevention

Wash hands thoroughly with soap and water before eating and after using the bathroom
Drink only safe, treated, or bottled water when traveling
Cook foods to proper internal temperatures and refrigerate leftovers promptly
Avoid raw or undercooked shellfish, meat, and unpasteurized dairy
Get vaccinated against rotavirus (for infants)

When to See a Doctor

Diarrhea lasts more than 2 days in adults or 24 hours in children
You show signs of severe dehydration: extreme thirst, dark urine, dizziness
Stools contain blood, pus, or are black and tarry
You have a fever above 102°F (39°C) along with diarrhea

Frequently Asked Questions

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