💨 Diarrhea

📖 What is Diarrhea?

Diarrhea is defined as having three or more loose or watery bowel movements per day, or more bowel movements than is normal for an individual. It occurs when the intestines move contents through too quickly, preventing adequate water absorption.

Types of Diarrhea

Mechanisms of Diarrhea

• Secretory: Intestines secrete excess fluid (toxin-producing infections, medications)
• Osmotic: Unabsorbed substances draw water into intestines (lactose intolerance, sugar alcohols)
• Inflammatory: Damage to intestinal lining (IBD, infections, radiation)
• Motility: Rapid intestinal transit (IBS-D, hyperthyroidism)

🔬 Causes

Acute Diarrhea (Most Common)

Viral Infections

• Rotavirus: Most common in children; vaccine available
• Norovirus: Very contagious; causes outbreaks
• Adenovirus: Common in young children

Bacterial Infections

• E. coli: Contaminated water, undercooked meat
• Salmonella: Eggs, poultry, contaminated food
• Campylobacter: Poultry, unpasteurized milk
• Shigella: Person-to-person, contaminated water
• V. cholerae: Contaminated water (in endemic areas)

Parasitic Infections

• Giardia: Contaminated water, common in travelers
• Cryptosporidium: Water-borne outbreaks
• Entamoeba histolytica: Amebiasis

Food Poisoning

Toxins produced by bacteria in food cause rapid-onset symptoms (often within hours):

• Staphylococcus aureus toxin
• Bacillus cereus (rice dishes)
• Clostridium perfringens

Chronic Diarrhea Causes

• IBS (irritable bowel syndrome): IBS-D subtype
• IBD: Crohn's disease, ulcerative colitis
• Celiac disease: Gluten-triggered
• Lactose intolerance: After dairy consumption
• Bile acid diarrhea: After gallbladder removal, ileal disease
• Microscopic colitis: Watery diarrhea in older adults
• SIBO: Small intestinal bacterial overgrowth
• Medications: Antibiotics, metformin, antacids, NSAIDs
• Hyperthyroidism: Overactive thyroid
• Diabetes: Diabetic diarrhea from autonomic neuropathy

🚨 When to Seek Medical Care

Signs of Dehydration

💧 Rehydration - Most Important!

Preventing and treating dehydration is the most critical aspect of diarrhea management, especially in children and the elderly.

Oral Rehydration Solution (ORS)

ORS replaces lost fluids and electrolytes. Use commercial ORS packets or make at home:

What to Drink

• Best: ORS, diluted fruit juice (half water), clear broths
• Acceptable: Water, coconut water, weak tea
• Avoid: Full-strength fruit juice, soda, coffee, alcohol, sugary drinks

How Much to Drink

• Adults: At least 1-2 cups (240-480 mL) after each loose stool
• Children: Offer small sips frequently (use spoon or cup, not bottle)
• Continue drinking even if vomiting (small, frequent sips)

🍽️ Diet During Diarrhea

The BRAT Diet (and Beyond)

The traditional BRAT diet (Bananas, Rice, Applesauce, Toast) is a starting point but is nutritionally limited. A broader approach includes:

Foods to Eat

• Starches: White rice, khichdi, idli, plain toast, crackers, boiled potatoes
• Fruits: Bananas, applesauce
• Proteins: Plain boiled chicken, eggs, dal (well-cooked, thin)
• Vegetables: Cooked carrots, well-cooked vegetables
• Fluids: Clear broths, buttermilk (chaas), thin rasam
• Yogurt: Plain yogurt with live cultures (may help recovery)

Foods to Avoid

• Dairy products (except yogurt) - temporary lactose intolerance common
• Fatty and fried foods
• Spicy foods
• High-fiber foods, raw vegetables
• Caffeine and alcohol
• Sugar-free products (sorbitol worsens diarrhea)
• Gas-producing foods (beans, cabbage)

Gradually Returning to Normal Diet

As symptoms improve over 24-48 hours, gradually reintroduce regular foods. Start with simple, easy-to-digest foods and progress as tolerated.

💊 Medications

Anti-Diarrheal Medications

When Antibiotics Are Needed

Most acute diarrhea does not require antibiotics. They are indicated for:

• Severe bacterial infections (confirmed or strongly suspected)
• Traveler's diarrhea with fever or bloody stools
• Shigella, cholera, parasitic infections
• Immunocompromised patients
• C. difficile infection (specific antibiotics)

Probiotics

May help reduce duration of infectious diarrhea, especially in children. Saccharomyces boulardii and Lactobacillus rhamnosus GG have the most evidence. Also helpful in preventing antibiotic-associated diarrhea.

Zinc Supplementation

Recommended by WHO for children with diarrhea in developing countries. Reduces duration and severity. Dose: 20 mg/day for children over 6 months, 10 mg/day for younger infants, for 10-14 days.

✈️ Traveler's Diarrhea

Affects up to 50% of travelers to developing regions. Usually caused by E. coli and other bacteria.

Prevention

• Drink safely: Bottled, boiled, or treated water only
• Avoid ice: Made from tap water
• Eat cooked, hot foods: Avoid buffets where food sits out
• Peel fruits: Avoid pre-cut fruits and salads
• Hand hygiene: Wash hands frequently or use sanitizer

Treatment

• Mild: Rehydration, loperamide if needed
• Moderate-severe: Antibiotics (azithromycin, fluoroquinolone) for 1-3 days
• Bloody or febrile: Avoid loperamide, seek medical care

🛡️ Prevention

• Hand washing: With soap for at least 20 seconds, especially before eating and after bathroom
• Food safety: Cook foods to proper temperatures; refrigerate promptly
• Clean water: Ensure safe drinking water sources
• Vaccines: Rotavirus vaccine for infants; cholera vaccine for high-risk travelers
• Avoid undercooked foods: Especially meat, eggs, seafood
• Wash produce: Thoroughly wash fruits and vegetables
• Separate raw and cooked: Prevent cross-contamination

❓ Frequently Asked Questions