Diarrhoea: What it is, Causes, Symptoms, Treatment & Types

What is Diarrhoea?

Diarrhoea is a condition in which a person passes loose, watery stools, typically three or more times a day. It is not a disease itself but a symptom of an underlying problem affecting the digestive system. Diarrhoea usually occurs when the intestines are unable to absorb water properly or when they secrete excess fluid into the bowels.

During diarrhoea, the body loses significant amounts of water and essential electrolytes, such as sodium, potassium, and chloride, through loose stools and, in some cases, vomiting. If these fluids are not replaced promptly, dehydration can occur.

The main cause of the condition is infection by organisms such as viruses, bacteria, or parasites that enter the digestive system through contaminated food or water or poor hygiene practices. Also, it is important to note that frequent, soft stools in breastfed infants are usually normal and should not be mistaken for diarrhoea unless there is a clear change in the baby's usual bowel pattern.

What are the Types of Diarrhoea?

Diarrhoea can be classified based on how long the symptoms last:

How Common is Diarrhoea in India?

The condition of diarrhoea continues to be among the most prevalent diseases in India that affects millions of people each year. Despite improvements in sanitation, healthcare facilities, and public health awareness, diarrhoeal diseases continue to impose a heavy burden on populations, especially during the monsoon months and in areas with poor access to clean drinking water.

Government surveillance data reported more than 6 million diarrhoea cases in India in 2021, making it one of the highest annual totals recorded in recent years.

Research also indicates that diarrhoea is more common among children under 10 years of age, especially those aged 5-10 years.

In fact, about 18% of food poisoning patients have suffered from diarrhoea in India. There is variation in the incidence rate by geographic location, with more cases reported in the North-Eastern and Eastern parts of the country than in other regions.

What are the Symptoms of Diarrhoea?

The symptoms of diarrhoea can range from mild and short-lived to severe enough to require medical attention. While loose or watery stools are the main symptom, many people also experience other digestive and dehydration-related symptoms.

Common symptoms of diarrhoea include:

• Loose or Watery Stools: Passing loose, watery stools three or more times a day is the hallmark symptom of diarrhoea. Stools may be frequent and difficult to control.

• Abdominal Cramps and Pain: Many people experience abdominal cramping, bloating, or discomfort. The pain may come in waves and is often accompanied by an urgent need to use the toilet.

• Urgent or Frequent Bowel Movements: Diarrhoea can cause a sudden, intense urge to pass stools, sometimes making it difficult to reach a bathroom in time.

• Nausea and Vomiting: Stomach infections that cause diarrhoea may also trigger nausea and vomiting, increasing the risk of dehydration.

• Fever and Chills: A fever may develop when diarrhoea is caused by a viral, bacterial, or parasitic infection. Chills can occur alongside the fever as the body fights the infection.

• Blood or Mucus in the Stool: Mucus or blood in the stool is not characteristic of diarrhoea alone and might indicate a bacterial infection, dysentery, inflammatory bowel disease, or another underlying health condition that needs a doctor's attention.

• Bloating and Excess Gas: Some patients report feeling bloated or have excess amounts of gas, especially if their diarrhoea is due to a food intolerance condition or some form of digestive problem.

• Fatigue and Weakness: Frequent bowel movements may cause fluid and electrolyte loss, leaving you feeling tired, weak, or low on energy.

• Weight Loss: Persistent or chronic diarrhoea may interfere with the body's ability to absorb nutrients properly, leading to unintended weight loss over time.

• Dark-coloured or Less Frequent Urination: It can be an early sign of dehydration, indicating that the body is not getting enough fluids.

• Dizziness: Loss of fluid due to diarrhoea may cause dizziness, especially when standing up quickly.

• Irritability or Confusion: Severe dehydration can disrupt brain function, leading to abnormal irritability, sleepiness, or confusion, especially in kids and elderly people.

• Few or No Tears When Crying: In infants and toddlers, crying without tears can be an important warning sign of dehydration and should not be ignored.

What Causes Diarrhoea?

Diarrhoea can develop for many reasons, but digestive tract infections are the most common cause. Some of the most common causes of diarrhoea include the following:

• Viral Infections: Viruses can be a major cause of diarrhoea, particularly in children. Rotavirus, norovirus, adenovirus, and astrovirus are common viral agents causing such diseases. Infections caused by viruses are transmitted through the consumption of contaminated food or water or through close contact with an infected individual.

• Bacterial Infections: Bacteria like Escherichia coli (E. coli), Salmonella, Shigella, and Campylobacter can infect the digestive tract and cause diarrhoea. These infections are commonly associated with contaminated food, unsafe drinking water, or poor food-handling methods.

• Parasitic Infections: Parasites such as Giardia, Cryptosporidium, and Entamoeba histolytica can cause diarrhoea, especially in areas with poor sanitation or contaminated water supplies.

• Food Poisoning: Eating food or drinking beverages contaminated with harmful bacteria, viruses, parasites, or their toxins can irritate the digestive system and trigger sudden diarrhoea, often accompanied by nausea, vomiting, or abdominal cramps.

• Certain Medications: Some medicines are capable of disrupting the normal balance of gut bacteria or impact digestion, leading to diarrhoea. Common examples include antibiotics, chemotherapy drugs, and antacids that contain magnesium.

• Food Intolerances: People who have difficulty digesting certain foods may experience diarrhoea after eating them. Lactose intolerance, fructose intolerance, and sensitivity to certain artificial sweeteners are common examples.

• Digestive Disorders: Long-term conditions such as Irritable Bowel Syndrome (IBS), Inflammatory Bowel Disease (IBD), coeliac disease, and microscopic colitis can cause recurrent or chronic diarrhoea.

• Poor Hygiene and Sanitation: Inadequate access to clean drinking water, poor sanitation facilities, and improper hand hygiene increase the risk of diarrhoea-causing infections.

• Food Allergies: Sometimes, an allergic reaction to certain foods can cause digestive symptoms, including diarrhoea, abdominal pain, and nausea.

What are the Complications of Diarrhoea?

Most cases of diarrhoea improve within a few days, but severe or prolonged diarrhoea may lead to complications, especially in older adults, young children, and people with weakened immune systems.

• Dehydration: Dehydration is the most common and serious complication of diarrhoea. Frequent loose stools cause the body to lose large amounts of water and electrolytes, such as sodium and potassium. Signs of dehydration involve excessive thirst, dry mouth, dark urine, dizziness, and fatigue.

• Electrolyte Imbalance: Diarrhoea can lower the body's levels of important minerals, including sodium, potassium, and chloride. An electrolyte imbalance may cause muscle weakness, cramps, an irregular heartbeat, and other health problems if left unmanaged.

• Malnutrition: Persistent or chronic diarrhoea can interfere with nutrient absorption from food. Over time, this can eventually lead to weight loss, weakness, vitamin deficiencies, and poor overall health.

• Kidney Problems: Severe dehydration can reduce blood flow to the kidneys, impairing their function. In serious cases, it may lead to acute kidney injury.

• Increased Risk of Serious Infection: Certain infections that cause diarrhoea can spread beyond the intestines and lead to progressively severe illness if left untreated.

• Growth and Development Issues in Children: Repeated or long-lasting episodes of diarrhoea can affect a child's nutritional status, may affect growth, development, and overall wellbeing.

When Should I See My Healthcare Provider?

Most cases of diarrhoea improve on their own within a few days with adequate rest and fluid intake. However, some symptoms may indicate a more severe condition or complications that require medical attention. It is important to see a healthcare provider if you experience any of the following:

• Diarrhoea lasting more than 2 days in adults or more than 24 hours in children.

• Signs of dehydration, like extreme thirst, dry mouth, dark urine, dizziness, or very little urine output.

• Severe or persistent abdominal pain or cramping.

• A high fever, especially above 39°C.

• Blood, pus, or black, tarry stools.

• Frequent vomiting that prevents you from keeping fluids down.

• Severe weakness, drowsiness, confusion, or fainting.

• Unexplained weight loss or signs of poor nutrition.

• Diarrhoea that occurs after recent travel or consumption of potentially contaminated food or water.

How is Diarrhoea Diagnosed?

Investigations may be needed if symptoms are severe, persistent, recurrent, or associated with warning signs such as dehydration, blood in the stool, or fever.

How is Diarrhoea Treated?

Treatment for diarrhoea depends on its cause, severity, and duration. Most mild cases improve within a few days with proper hydration and rest.

• Drink Plenty of Fluids: Water, clear soups, coconut water, and oral rehydration solutions (ORS) help replace fluids and electrolytes lost through frequent loose stools.

• Use Oral Rehydration Solution (ORS): ORS is one of the most effective treatments for diarrhoea-related dehydration. It contains the right balance of salts and glucose to help the body absorb fluids more efficiently.

• Continue Eating Light Foods: Foods such as rice, bananas, applesauce, toast, potatoes, and khichdi are generally well tolerated and can help maintain energy levels during recovery.

• Avoid Foods that may Worsen Symptoms: Fatty, spicy, fried, or heavily processed foods, as well as excessive caffeine and alcohol, may irritate the digestive system and prolong symptoms.

• Medications: Depending on the underlying reason, your doctor may prescribe anti-diarrhoeal drugs, probiotics or other forms of treatment. Self-medication does not always work, especially when fever or blood in stools is present.

• Replace Lost Nutrients: Diarrhoea that lasts for a long time may interfere with the absorption of nutrients from food. Having a nutritious meal with improved symptoms will help with recovery.

• Seek Medical Care for Severe Cases: Hospital treatment may be needed if diarrhoea causes severe dehydration, persistent vomiting, significant electrolyte imbalances, or other complications. In such cases, fluids may be given intravenously.

What is the Prognosis for Diarrhoea?

The prognosis for most patients with diarrhoea is quite good, as most cases are mild and do not lead to serious health consequences. Usually, acute diarrhoea resulting from viral infection, mild food poisoning, or temporary digestive disorders gets better with hydration and rest.

However, the outlook depends on the underlying cause, the severity of symptoms, and how quickly fluid losses are replaced. Persistent or chronic diarrhoea may require treatment of an underlying condition, such as a digestive disorder, food intolerance, or infection.

How Can I Prevent Diarrhoea?

While it is not always possible to prevent diarrhoea, many cases can be avoided by practising good hygiene.

• Drink Safe and Clean Water: Use boiled, filtered, or properly treated water for drinking and food preparation.

• Wash Your Hands Regularly: Always wash your hands with soap and water before having meals and when handling food for cooking. Also, wash your hands properly after using the toilet.

• Follow Safe Food Practices: Cook foods thoroughly, especially meat, poultry, seafood, and eggs. Store perishable foods at appropriate temperatures and avoid cross-contamination between raw and cooked foods.

• Get Children Vaccinated Against Rotavirus: Rotavirus vaccination helps protect infants and young children from severe diarrhoea and its complications and is recommended as part of routine childhood immunisation programmes.

• Breastfeed Infants When Possible: Exclusive breastfeeding during the first six months of life helps protect babies from diarrhoeal infections and can reduce the severity of illness if diarrhoea occurs.

• Maintain Good Sanitation and Hygiene: Using clean toilet facilities and disposing of human waste safely helps prevent the spread of germs that cause diarrhoea.

• Be Cautious When Travelling: Avoid consuming untreated water, ice made from unsafe water, raw or undercooked foods, and unwashed fruits and vegetables in areas where food and water safety may be a concern.

• Wash Fruits and Vegetables Before Eating: Properly cleaning fresh produce can help remove harmful bacteria, viruses, and parasites that may cause gastrointestinal infections.

Does Health Insurance Cover Diarrhoea?

Yes, health insurance may cover the cost of diarrhoea treatment if the condition becomes severe enough to require hospitalisation or other medically necessary treatment covered under the policy. Coverage typically includes expenses such as doctor consultations during hospitalisation, diagnostic tests, medicines, room charges, nursing fees, IV fluids, and treatment for complications like severe dehydration or electrolyte imbalance.

However, mild cases of diarrhoea, which can be treated on an outpatient basis, are usually not covered by any health insurance plan unless OPD cover is part of the policy. Coverage can also vary depending on the insurer, policy terms, waiting periods, exclusions, and the underlying cause of the illness.

How Much Health Insurance Coverage is Needed for Diarrhoea Treatment?

A health insurance cover of ₹5 lakh is generally sufficient for diarrhoea treatment, including hospitalisation, diagnostic tests, medicines, IV fluids, and treatment of complications such as dehydration. It can also provide financial protection for other common medical emergencies that may require hospital care.