What causes diarrhoea nz

Overview

Diarrhoea, often referred to as 'the runs' or 'loose stools', is a common ailment experienced by people of all ages in New Zealand. It is characterised by frequent, loose, or watery bowel movements and can be a symptom of various underlying issues, ranging from mild, short-lived infections to more serious chronic conditions. Understanding the common causes of diarrhoea in the New Zealand context is crucial for effective prevention and management.

Common Causes of Diarrhoea in New Zealand

Infectious Causes (The Most Frequent Culprits)

The vast majority of acute diarrhoea cases in New Zealand are caused by infections, often referred to as gastroenteritis or 'tummy bugs'. These infections can be spread easily, especially in community settings like schools, workplaces, and childcare centres.

Viral Infections

Viruses are the leading cause of diarrhoea worldwide, and New Zealand is no exception. These viruses are highly contagious and spread through close contact with an infected person, consuming contaminated food or water, or touching contaminated surfaces and then touching your mouth.

• Norovirus: Often referred to as the 'winter vomiting bug', norovirus is a highly contagious virus that causes vomiting and diarrhoea. Outbreaks are common in New Zealand, particularly in closed communities.
• Rotavirus: While vaccination has reduced its incidence, rotavirus remains a significant cause of severe diarrhoea in infants and young children. It can lead to dehydration if not managed properly.
• Adenovirus and Astrovirus: Other viruses can also cause gastroenteritis, though they are generally less common than norovirus and rotavirus.

Bacterial Infections

Bacterial infections are another significant cause of diarrhoea, often associated with foodborne illnesses. These bacteria can contaminate food during preparation, processing, or storage, or through inadequate hygiene practices.

• Campylobacter: This is one of the most common bacterial causes of diarrhoea in New Zealand, often linked to undercooked poultry or contaminated milk.
• Salmonella: Commonly found in raw eggs, poultry, and unpasteurised dairy products, Salmonella can cause fever, abdominal cramps, and diarrhoea.
• E. coli (Escherichia coli): Certain strains of E. coli, particularly Shiga toxin-producing E. coli (STEC), can cause severe abdominal cramps, bloody diarrhoea, and vomiting. Contamination can occur through undercooked meat, unpasteurised milk, or contaminated water.
• Shigella: Less common in New Zealand but still a possibility, Shigella causes dysentery, a severe form of diarrhoea often with blood and mucus.

Parasitic Infections

While less common than viral or bacterial causes for acute diarrhoea, parasitic infections can cause prolonged or recurrent symptoms. These are often contracted through contaminated water or food.

• Giardia: This parasite is commonly found in contaminated water sources, including recreational lakes and rivers in New Zealand. It can cause diarrhoea, bloating, and stomach cramps.
• Cryptosporidium: Similar to Giardia, Cryptosporidium can be contracted from contaminated water and causes watery diarrhoea.

Non-Infectious Causes

While infections are the most common cause of sudden-onset diarrhoea, several non-infectious factors can lead to or contribute to diarrhoea, particularly in cases that are chronic or recurrent.

Medications

Antibiotics are a well-known cause of diarrhoea. They work by killing harmful bacteria in the body, but they can also disrupt the natural balance of 'good' bacteria in the gut, leading to diarrhoea. Other medications, including certain chemotherapy drugs, antacids containing magnesium, and some blood pressure medications, can also have diarrhoea as a side effect.

Food Intolerances and Allergies

Many New Zealanders experience diarrhoea due to difficulties digesting certain foods.

• Lactose Intolerance: The inability to fully digest lactose, the sugar found in milk and dairy products, is common and can lead to bloating, gas, and diarrhoea after consuming dairy.
• Fructose Malabsorption: Difficulty absorbing fructose, a sugar found in fruits, honey, and high-fructose corn syrup, can also cause digestive upset.
• Food Allergies: While less common than intolerances, true food allergies (e.g., to nuts, shellfish) can trigger a range of symptoms, including diarrhoea.

Chronic Digestive Conditions

For some individuals in New Zealand, diarrhoea is a symptom of a long-term health issue affecting the digestive system.

• Irritable Bowel Syndrome (IBS): IBS is a common functional gastrointestinal disorder that can manifest with diarrhoea (IBS-D), constipation (IBS-C), or a mix of both. Symptoms are often triggered by stress, certain foods, or hormonal changes.
• Inflammatory Bowel Disease (IBD): This category includes Crohn's disease and ulcerative colitis, which are chronic inflammatory conditions of the digestive tract. Diarrhoea, often bloody, is a hallmark symptom.
• Celiac Disease: An autoimmune disorder triggered by gluten, celiac disease can cause diarrhoea, weight loss, and fatigue in affected individuals.

Other Factors

• Alcohol: Excessive alcohol consumption can irritate the digestive tract and lead to diarrhoea.
• Artificial Sweeteners: Some artificial sweeteners, particularly sorbitol and mannitol, can have a laxative effect.
• Stress and Anxiety: The gut-brain connection is strong, and emotional stress can trigger or worsen diarrhoea in some people.

When to Seek Medical Advice in New Zealand

While most cases of diarrhoea resolve on their own within a few days, it's important to seek medical advice from a New Zealand healthcare provider if you experience any of the following:

• Severe abdominal pain
• Blood or mucus in your stool
• High fever
• Signs of dehydration (e.g., decreased urination, dry mouth, dizziness)
• Diarrhoea lasting longer than a few days, especially in infants, the elderly, or those with compromised immune systems
• Recent travel to areas where water or food might be contaminated

By understanding the diverse range of causes for diarrhoea in New Zealand, individuals can take appropriate steps to prevent infections, identify triggers, and seek timely medical care when necessary.