Diarrhoea: 370,000 children die annually from this preventable disease
Diarrhoea: Second leading killer of children—370,000 deaths annually from preventable disease
Four-year-old Amara’s mother knew something was terribly wrong.
The diarrhoea started suddenly—watery stools, one after another, hour after hour. By the second day, Amara couldn’t keep anything down. Her eyes looked sunken. Her skin felt dry and cool. When her mother pinched the skin on her daughter’s hand, it stayed tented instead of bouncing back.
The clinic was three hours away. They had no money for transport. The village well that everyone used had been contaminated after recent flooding, but what choice did families have?
By the time a neighbor drove them to the health center, Amara was barely conscious. Severe dehydration had pushed her small body to the edge of organ failure.
“We see this constantly,” said Dr. Maria Santos, the physician who treated Amara. “A child with simple diarrhoea who becomes critically ill because of dehydration. And we know exactly how to prevent it and treat it. But the solutions aren’t reaching the children who need them most.”
Amara survived. But 370,000 children under five years old didn’t in 2019 alone, according to WHO’s data on diarrhoeal disease. Diarrhoea is the second leading cause of death in young children globally.
And almost every single death is preventable.
What Diarrhoea Actually Is
Diarrhoea is defined as the passage of three or more loose or liquid stools per day, or more frequently than normal for the individual, as explained in WHO’s fact sheet on diarrhoeal disease.
It’s usually a symptom of gastrointestinal infection caused by bacterial, viral, or parasitic organisms. Infection spreads through contaminated food or drinking water, or from person to person due to poor hygiene—particularly when people don’t wash hands after using the toilet or before preparing food.
There are three clinical types of diarrhoea, each with specific characteristics:
Acute watery diarrhoea lasts several hours or days. This includes cholera, which can kill within hours if untreated due to massive fluid loss.
Acute bloody diarrhoea, also called dysentery, indicates intestinal damage and often signals bacterial infection like Shigella.
Persistent diarrhoea lasts 14 days or longer, causing serious nutritional problems and increasing risk of death.
The most severe threat posed by diarrhoea is dehydration. During an episode, water and electrolytes—including sodium, chloride, potassium, and bicarbonate—are lost through liquid stools, vomit, sweat, urine, and breathing. Dehydration occurs when these losses aren’t replaced.
In the past, severe dehydration and fluid loss were the main causes of death from diarrhoea. Now, septic bacterial infections account for an increasing proportion of diarrhoea-associated deaths, particularly in malnourished children.
Additionally, diarrhoea is a major cause of malnutrition, creating a vicious cycle—malnourished children are more susceptible to diarrhoea, and diarrhoea worsens malnutrition, making children vulnerable to more frequent and severe episodes.
For more on child health challenges, see our article on preventable childhood diseases.
The Staggering but Preventable Death Toll
Let those numbers sink in: 370,000 children under five died from diarrhoeal disease in 2019. That’s more than 1,000 children dying every single day from something we know how to prevent and treat.
The deaths concentrate overwhelmingly in low- and middle-income countries where access to safe drinking water, sanitation, and basic healthcare remains inadequate.
One in three people globally—2.2 billion people—don’t have access to safe drinking water, according to WHO and UNICEF data. Billions more lack adequate sanitation facilities.
Without clean water and proper sanitation, diarrhoeal disease spreads relentlessly. Contaminated water sources become vectors for bacteria like E. coli, Salmonella, and Campylobacter; viruses like rotavirus and norovirus; and parasites like Giardia and Cryptosporidium.
Poor hygiene perpetuates transmission. When people don’t wash hands after defecation or before food preparation, pathogens transfer to others. When human waste contaminates water sources, entire communities drink pathogen-laden water.
The tragedy is that we possess the knowledge and tools to prevent these deaths. What’s lacking is implementation at scale in the regions where children are dying.
What Actually Prevents Diarrhoea
Prevention measures are well-established and cost-effective:
Access to safe drinking water eliminates waterborne pathogens. This requires protected wells, water treatment systems, and infrastructure maintenance.
Improved sanitation prevents human waste from contaminating water and food. Proper toilets, sewage systems, and waste treatment protect communities.
Handwashing with soap at critical times—after using the toilet, after cleaning children, before preparing food, before eating—interrupts transmission. Simple but remarkably effective.
Exclusive breastfeeding for the first six months provides both nutrition and protection. Breast milk contains antibodies and other protective factors that prevent diarrhoeal infections. Breastfeeding also reduces severity if diarrhoea does occur. WHO emphasizes that exclusive breastfeeding is protective and prevents diarrhoea in young children.
Good personal and food hygiene prevents contamination. This includes safe food storage, proper cooking temperatures, protecting food from flies and pests, and consuming safe water.
Health education about how infections spread enables behavior change. When communities understand transmission routes, they adopt preventive practices.
Rotavirus vaccination protects against the most common cause of severe diarrhoea in young children. Rotavirus vaccines have dramatically reduced diarrhoea deaths in countries with high vaccination coverage.
These interventions require both individual behavior change and community-level infrastructure—a comprehensive approach addressing water systems, sanitation facilities, health education, and immunization programs.
The Life-Saving Treatments
When diarrhoea occurs despite prevention efforts, simple treatments save lives:
Oral rehydration salts (ORS) are a proven life-saving commodity for treating children with diarrhoea. These specially formulated mixtures of water, salts, and glucose replace lost fluids and electrolytes. The low-osmolarity formula recommended by WHO is particularly effective.
ORS prevents and treats dehydration, the primary killer in diarrhoeal disease. These packets cost pennies and can be administered by parents at home or health workers in clinics.
Zinc supplements reduce diarrhoea duration by 25% and decrease stool volume by 30%. Zinc strengthens the immune system and promotes intestinal healing. WHO recommends zinc supplementation for all children with diarrhoea.
Continued feeding with nutrient-rich foods breaks the malnutrition-diarrhoea cycle. Historically, parents were told to stop feeding children with diarrhoea. We now know this worsens malnutrition. Children should continue eating nutrient-rich foods—including breast milk—during episodes and receive nutritious diets when well.
Intravenous fluids become necessary for severe dehydration or shock when children can’t take oral fluids.
Consulting health professionals is critical for persistent diarrhoea, bloody stools, or signs of dehydration—sunken eyes, dry mouth, reduced urination, lethargy, or skin that doesn’t bounce back when pinched.
WHO recently published an operational guide on water, sanitation, hygiene, and infection prevention and control for infectious diarrhoea in healthcare settings, recognizing that healthcare facilities themselves can transmit diarrhoeal diseases without proper WASH and infection control.
The Water and Sanitation Crisis
The diarrhoea death toll cannot be separated from the water and sanitation crisis.
WHO’s Global Health Observatory data on water and sanitation reveals massive gaps. Billions lack safely managed drinking water services. Even more lack safely managed sanitation.
In many regions, people drink from surface water sources—rivers, lakes, unprotected springs—contaminated with human and animal waste. They defecate in open areas because toilets don’t exist. They can’t wash hands because water isn’t available.
These conditions guarantee ongoing diarrhoeal disease transmission.
Investment in water and sanitation infrastructure would prevent far more disease than hospitals could ever treat. Yet infrastructure investment lags far behind medical interventions in global health funding.
For more articles on water, sanitation, and health, visit ObserverVoice.com.
What Must Happen
Reducing diarrhoeal disease deaths to near-zero requires comprehensive action:
Universal access to safe water and sanitation must become reality, not just aspiration. This requires massive infrastructure investment, particularly in rural areas and informal urban settlements.
Rotavirus vaccination should reach all children. Current coverage remains inadequate in many high-burden countries.
ORS and zinc availability must be universal. These cheap, effective treatments should be in every home and health facility.
Breastfeeding promotion and support should be strengthened. Exclusive breastfeeding for six months provides unmatched protection.
Community health worker programs can deliver health education, ORS, zinc, and identify children needing referral.
Hygiene behavior change campaigns must address handwashing, food safety, and safe water storage.
WHO’s work on managing childhood illness provides frameworks for integrated approaches addressing diarrhoea alongside other common childhood conditions.
The Bottom Line
Diarrhoeal disease kills 370,000 children under five annually—the second leading cause of child death globally. The most severe threat is dehydration from fluid and electrolyte loss.
We know how to prevent diarrhoea: safe water, improved sanitation, handwashing, exclusive breastfeeding, food hygiene, health education, and rotavirus vaccination.
We know how to treat diarrhoea: oral rehydration salts, zinc supplements, continued feeding with nutrient-rich foods, and medical care for severe cases.
Yet children continue dying because prevention and treatment don’t reach them. One in three people globally lacks safe drinking water. Billions lack adequate sanitation. ORS and zinc remain unavailable in many areas.
Back to Amara: intravenous fluids reversed her severe dehydration. She recovered fully. Her mother learned about ORS and now keeps packets at home. The next time diarrhoea strikes, she can start treatment immediately before dehydration develops.
But the village well remains contaminated. Until safe water becomes available, diarrhoea will continue spreading. Until sanitation improves, pathogens will continue circulating. Until these fundamental problems are solved, children will keep getting sick.
And some will keep dying from a disease we solved decades ago—at least for children lucky enough to be born in countries with clean water, working toilets, and access to basic healthcare.
Frequently Asked Questions (FAQs)
Diarrhoea is the passage of three or more loose or liquid stools per day, or more frequently than normal for an individual. It’s usually a symptom of gastrointestinal infection caused by bacterial, viral, or parasitic organisms. Common bacterial causes include E. coli, Salmonella, Campylobacter, and Shigella. Viral causes include rotavirus and norovirus. Parasitic causes include Giardia and Cryptosporidium. Infection spreads through contaminated food or drinking water, or person-to-person due to poor hygiene. Three clinical types exist: acute watery diarrhoea (lasting hours or days, includes cholera), acute bloody diarrhoea or dysentery, and persistent diarrhoea (lasting 14+ days). Learn more at WHO’s diarrhoea information page.
Diarrhoeal disease is the second leading cause of death in children under five globally, killing 370,000 children in 2019 alone—more than 1,000 children daily. The most severe threat is dehydration—during diarrhoea episodes, water and electrolytes (sodium, chloride, potassium, bicarbonate) are lost through liquid stools, vomit, sweat, urine, and breathing. Without replacement, dehydration leads to shock and organ failure. Additionally, diarrhoea causes malnutrition, creating a vicious cycle where malnourished children are more susceptible to diarrhoea, which worsens malnutrition. Septic bacterial infections now account for increasing proportions of diarrhoea-associated deaths. See WHO’s fact sheet on diarrhoeal disease for statistics.
Prevention measures are well-established: access to safe drinking water eliminates waterborne pathogens; improved sanitation prevents human waste from contaminating water and food; handwashing with soap at critical times (after toilet use, before food preparation) interrupts transmission; exclusive breastfeeding for the first six months provides protection—breast milk contains antibodies preventing infections and reduces severity if diarrhoea occurs; good food hygiene includes safe storage, proper cooking, and protecting food from contamination; health education about transmission enables behavior change; and rotavirus vaccination protects against the most common severe diarrhoea cause in young children. These require both individual behavior change and community infrastructure. WHO’s water and sanitation data shows massive access gaps.
Treatment centers on preventing and treating dehydration. Oral rehydration salts (ORS)—specially formulated mixtures of water, salts, and glucose—are proven life-saving treatments that replace lost fluids and electrolytes. The WHO-recommended low-osmolarity formula is particularly effective. Zinc supplements reduce diarrhoea duration by 25% and stool volume by 30% while strengthening immunity. Continued feeding with nutrient-rich foods including breast milk breaks the malnutrition-diarrhoea cycle—stopping feeding worsens outcomes. Intravenous fluids become necessary for severe dehydration or shock. Consulting health professionals is critical for persistent diarrhoea, bloody stools, or dehydration signs (sunken eyes, dry mouth, reduced urination, lethargy). See WHO’s operational guide on diarrhoea management.
Despite effective prevention and treatment existing, 370,000 children still die annually because solutions don’t reach those who need them most. One in three people globally—2.2 billion—lack access to safe drinking water. Billions more lack adequate sanitation. Deaths concentrate in low- and middle-income countries where water/sanitation infrastructure is inadequate, ORS and zinc availability is limited, healthcare access is poor, rotavirus vaccination coverage remains low, and poverty prevents families from affording treatment or transport to facilities. Investment in water/sanitation infrastructure lags far behind medical interventions despite preventing more disease. Until universal access to safe water, sanitation, and basic healthcare becomes reality, children will continue dying from this preventable disease.
- WHO Diarrhoea Information Hub
- WHO Fact Sheet on Diarrhoeal Disease
- Safe Drinking Water Fact Sheet
- Sanitation Fact Sheet
- WHO Water and Sanitation Data
- Managing Childhood Illness
- Operational Guide: WASH and Infection Control for Diarrhoea
- Safer Water, Better Health Report
- Five Keys to Safer Food
Disclaimer: This article is an adaptation of publicly available information from WHO’s Diarrhoea
health topic page (WHO, Geneva. Licence: CC BYNC-SA 3.0 IGO). WHO is not responsible for the
content or accuracy of this adaptation. This content is for informational and educational purposes
only and does not constitute medical advice. ObserverVoice.com is a news and information platform
— not a healthcare provider.
Observer Voice is the one stop site for National, International news, Sports, Editor’s Choice, Art/culture contents, Quotes and much more. We also cover historical contents. Historical contents includes World History, Indian History, and what happened today. The website also covers Entertainment across the India and World.
