Diarrhea: Causes, Symptoms and Treatment
Diarrhea means passing loose or watery stools three or more times a day. It can be acute or chronic and has many causes, ranging from infections to chronic bowel conditions.
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Diarrhea means passing loose or watery stools three or more times a day. It can be acute or chronic and has many causes, ranging from infections to chronic bowel conditions.
What Is Diarrhea?
Diarrhea is defined as passing loose or watery stools three or more times within 24 hours. It is one of the most common medical complaints worldwide and can affect people of all ages. Diarrhea may be accompanied by abdominal cramps, bloating, nausea, and an urgent need to use the toilet. While it is often short-lived and harmless, persistent diarrhea can lead to serious complications such as dehydration.
Causes
Diarrhea is classified as either acute (lasting fewer than 4 weeks) or chronic (lasting 4 weeks or longer). The causes differ between these two forms.
Common Causes of Acute Diarrhea
- Infections: bacteria (e.g., Salmonella, Campylobacter), viruses (e.g., norovirus, rotavirus), or parasites (e.g., Giardia lamblia)
- Food poisoning: caused by contaminated food or water
- Medications: especially antibiotics or laxatives
- Traveler's diarrhea: common when visiting regions with lower hygiene standards
- Stress and emotional upset
Common Causes of Chronic Diarrhea
- Irritable bowel syndrome (IBS)
- Inflammatory bowel diseases such as Crohn's disease or ulcerative colitis
- Food intolerances such as lactose intolerance or celiac disease (gluten intolerance)
- Hyperthyroidism (overactive thyroid)
- Microscopic colitis or colorectal tumors
Symptoms
In addition to loose or watery stools, diarrhea may be accompanied by:
- Abdominal pain and cramping
- Bloating and flatulence
- Nausea and vomiting
- Fever (in cases of infection)
- Blood or mucus in the stool (in more serious conditions)
- Signs of dehydration: dry mouth, dizziness, reduced urination
Diagnosis
The diagnostic approach depends on the duration and severity of symptoms. Common tests include:
- Stool analysis: to detect pathogens, blood, or inflammatory markers
- Blood tests: inflammatory markers, electrolytes, thyroid hormones
- Colonoscopy: indicated in chronic or bloody diarrhea
- Abdominal ultrasound
- Breath tests: for suspected food intolerances (e.g., lactose, fructose)
Treatment
General Measures
The most important step in managing diarrhea is replacing lost fluids and electrolytes to prevent dehydration. Suitable options include water, clear broth, or specially formulated oral rehydration solutions (ORS). A bland diet consisting of easily digestible foods such as toast, bananas, or cooked rice can help ease symptoms.
Medications
- Loperamide: reduces bowel motility and urgency – suitable only for non-infectious diarrhea
- Probiotics: may help restore gut flora and shorten the duration of diarrhea
- Antibiotics: prescribed only for confirmed bacterial infections
- Racecadotril: reduces excess fluid secretion into the intestine
Treating the Underlying Cause
For chronic diarrhea, treatment focuses on the underlying condition – for example, a gluten-free diet for celiac disease, specific medications for inflammatory bowel disease, or dietary adjustments for food intolerances.
When to See a Doctor
Medical attention should be sought promptly in the following situations:
- Diarrhea lasting more than 2–3 days without improvement
- Blood or mucus in the stool
- High fever (above 38.5 °C / 101.3 °F)
- Signs of dehydration (extreme thirst, little or no urination, dizziness)
- Diarrhea in infants, young children, or elderly individuals
- Severe abdominal pain
Prevention
The risk of infectious diarrhea can be significantly reduced by following basic hygiene practices:
- Regular and thorough handwashing
- Safe preparation and storage of food
- Drinking clean, safe water – especially when traveling
- Vaccinations (e.g., rotavirus vaccine for infants)
References
- World Health Organization (WHO): Diarrhoeal disease – Fact Sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/diarrhoeal-disease (2023)
- DuPont, H. L.: Acute infectious diarrhea in immunocompetent adults. New England Journal of Medicine, 370(16), 1532–1540 (2014).
- Schiller, L. R. et al.: American Gastroenterological Association Clinical Practice Update on the Management of Chronic Diarrhea. Gastroenterology, 158(4), 875–883 (2020).
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