Saturday, August 9, 2025

Diarrhoea

Diarrhoea – Causes, Symptoms, Treatment, and Prevention

~Introduction

Diarrhoea is one of the most common health conditions affecting people worldwide, regardless of age, gender, or location. It refers to the passing of loose, watery stools more frequently than usual. Although it can be a mild and short-lived condition, in some cases, diarrhoea can become severe, leading to dehydration, malnutrition, and even death—particularly among infants, young children, and the elderly.

According to the World Health Organization (WHO), diarrhoea is the second leading cause of death in children under five years old, killing around half a million children annually. Most cases are caused by infections of the gastrointestinal tract due to viruses, bacteria, or parasites, but diarrhoea can also result from non-infectious factors such as food intolerances, certain medications, and chronic illnesses.

Understanding the causes, recognizing the symptoms early, and adopting effective treatment and prevention strategies are essential to reducing the burden of this disease.

~Definition and Medical Overview

Diarrhoea is defined as the passage of three or more loose or watery stools within 24 hours, or more frequently than is normal for an individual. The condition occurs when the intestine is unable to properly absorb water from digested food, or when excess water is secreted into the bowel.

There are three main clinical categories:

Acute watery diarrhoea – Lasts several hours to days; includes cholera.
Acute bloody diarrhoea (dysentery) – Caused by bacterial infections such as Shigella.
Persistent diarrhoea – Lasts 14 days or more and is often linked to malnutrition and chronic diseases.

~Causes of Diarrhoea

Diarrhoea can have both infectious and non-infectious causes.

1. Infectious Causes

Viral infections
- Rotavirus – Most common cause of severe diarrhoea in children.
- Norovirus – Leading cause of gastroenteritis outbreaks in adults.
- Adenovirus, Astrovirus – Also cause gastroenteritis in children.
Bacterial infections
- Escherichia coli (E. coli) – Often from contaminated food or water.
- Salmonella – Linked to undercooked poultry, eggs, and dairy.
- Shigella – Causes bloody diarrhoea (shigellosis).
- Vibrio cholerae – Causes cholera, a severe form of watery diarrhoea.
- Campylobacter jejuni – From contaminated food or water.
Parasitic infections
- Giardia lamblia – Common in areas with poor sanitation.
- Entamoeba histolytica – Causes amoebic dysentery.
- Cryptosporidium – Often from contaminated water.

2. Non-infectious Causes

Food intolerances – Lactose intolerance, gluten intolerance (celiac disease).
Medications – Antibiotics, chemotherapy drugs, antacids containing magnesium.
Digestive disorders – Irritable bowel syndrome (IBS), inflammatory bowel disease (Crohn’s disease, ulcerative colitis).
Hormonal disorders – Hyperthyroidism, diabetes complications.
Post-surgery effects – Especially after gallbladder or bowel surgery.

~Symptoms of Diarrhoea

The hallmark symptom is frequent passage of loose or watery stools. Additional symptoms may include:

Abdominal cramps and pain
Urgency to pass stool
Nausea and vomiting
Fever
Bloating
Dehydration signs: dry mouth, sunken eyes, excessive thirst, reduced urine output, dizziness
Blood or mucus in stools (in case of dysentery)

~Complications

While mild diarrhoea often resolves without complications, severe or prolonged diarrhoea can cause:

Dehydration – The most dangerous complication, especially in children and the elderly.
Electrolyte imbalance – Loss of sodium, potassium, and chloride can disrupt bodily functions.
Malnutrition – Chronic diarrhoea interferes with nutrient absorption.
Organ damage – Severe dehydration can affect kidneys and other organs.
Death – Particularly in vulnerable populations without timely treatment.

~Diagnosis

Diagnosis involves determining the underlying cause.

1. Medical History and Physical Examination

Duration and severity of symptoms
Recent food and water intake
Travel history
Contact with sick individuals
Use of medications

2. Laboratory Tests

Stool analysis – Microscopy, culture, and sensitivity tests to detect pathogens.
Blood tests – To check electrolyte levels, kidney function, and signs of infection.
Rapid diagnostic tests – For detecting rotavirus, cholera, or other pathogens.
Endoscopy or colonoscopy – For chronic or unexplained diarrhoea.

~Treatment

Treatment depends on the cause, severity, and duration of diarrhoea.

1. Rehydration

Oral rehydration salts (ORS) – WHO recommends a solution containing sodium, glucose, and potassium to restore fluids and electrolytes.
Homemade solution – A simple mix of clean water, salt, and sugar can help if ORS is unavailable.
Intravenous fluids – For severe dehydration or inability to drink.

2. Medications

Antibiotics – Only for bacterial causes such as cholera or shigellosis, and only when prescribed.
Antimotility agents – Such as loperamide, for non-infectious diarrhoea in adults.
Zinc supplementation – Especially in children, to reduce severity and duration.

3. Dietary Management

Continue feeding children and breastfeeding infants.
Eat easily digestible foods: rice, bananas, toast, boiled potatoes.
Avoid greasy, spicy, or high-fiber foods during acute diarrhoea.

~Prevention

Preventive measures focus on hygiene, sanitation, and safe food practices.

1. Safe Water

Drink boiled, filtered, or treated water.
Avoid ice made from unsafe water.

2. Food Safety

Wash fruits and vegetables thoroughly.
Cook food thoroughly and eat it hot.
Avoid raw seafood and unpasteurized milk.

3. Personal Hygiene

Wash hands with soap before eating or preparing food and after using the toilet.
Teach children proper handwashing techniques.

4. Sanitation

Proper disposal of human waste.
Maintain clean toilets and surroundings.

5. Vaccination

Rotavirus vaccine significantly reduces diarrhoea cases in children.

~Public Health Impact

Diarrhoea is both a medical and social issue. It causes:

High healthcare costs
Missed school and work days
Long-term developmental impacts in children due to malnutrition
Burden on healthcare systems in developing countries

Global initiatives like the WHO/UNICEF Integrated Global Action Plan for the Prevention and Control of Pneumonia and Diarrhoea (GAPPD) aim to reduce preventable child deaths through improved nutrition, immunization, and sanitation.

~Conclusion

Diarrhoea is a preventable and treatable condition, yet it remains a major cause of illness and death in many parts of the world. While mild cases resolve with rest and hydration, severe cases require urgent medical care to prevent life-threatening dehydration and other complications.
Access to safe drinking water, improved sanitation, proper nutrition, vaccination, and health education are key strategies to combat diarrhoea globally.

By addressing both the medical and social determinants, we can significantly reduce the burden of diarrhoea and save countless lives—especially among children.

Health Lines