When hit with sudden nausea, vomiting and diarrhoea, it can be difficult to figure out whether these are the symptoms of stomach bug or food poisoning. A stomach bug, also called viral gastroenteritis, is a common intestinal infection caused by various viruses, most frequently norovirus or rotavirus that are highly contagious and spread rapidly. On the other hand, food poisoning, also called foodborne illness, is a condition caused by consuming contaminated food or beverages which results from ingesting harmful bacteria, viruses, parasites, or toxins that have grown on or been introduced to food through improper handling, preparation, or storage. Read this article to know the difference between the two.

Causes of Stomach Bug

The main causes of stomach bug include virulent or transmission methods:

Virus: Stomach can be caused by viruses such as Norovirus, Rotavirus, Adenovirus and Astrovirus that might be present in the ingested food or water.
Transmission methods: Methods such as person-to-person contact, consuming contaminated food and water or exposure to an infected person’s vomit or faeces can be one cause.
Environmental factors: Some poor hygiene practices, crowded living conditions or improper hygiene may cause stomach bugs.

Seasonal variations

Weakened immune system

Travel

On the other hand, the causes of food poisoning are bacteria-based:

Bacteria: Primarily caused by bacteria (e.g., Salmonella, E. coli, Listeria), but can also be caused by viruses, parasites, or toxins.
Virus: Natural toxins in certain mushrooms or seafood and chemicals or pesticides on produce.
Food handling practices: Inadequate cooking temperatures, cross-contamination between raw and cooked foods or poor personal hygiene of food handlers.
Raw or unpasteurised products: Milk, cheese, and other dairy products, eggs or meat and seafood.

Unwashed fruits and vegetables

Food processing failures: Inadequate canning processes or contamination during manufacturing.

Incubation period

Food poisoning and stomach bugs may have different incubation periods:

Food poisoning: Often has a shorter incubation period, with symptoms appearing within hours
Stomach bug: Usually takes 24-48 hours for symptoms to develop

Symptoms

The symptoms of Food Poisoning are:

Nausea
Vomiting
Diarrhoea (often watery)
Abdominal pain and cramps
Fever (can be high)
Headache
Muscle aches
Fatigue
Dehydration
Bloody stools (in severe cases)
Rapid onset (usually within hours of eating contaminated food)

The symptoms of Stomach Bug are:

Nausea
Vomiting
Diarrhoea (usually watery)
Abdominal cramps
Low-grade fever
Body aches
Fatigue
Headache
Loss of appetite
Dehydration
Gradual onset (typically 24-48 hours after exposure)

Main differences:

Onset: Food poisoning symptoms usually appear faster
Fever: Often higher in food poisoning
Duration: Stomach bugs typically last longer (1-3 days vs. 24-48 hours for food poisoning)
Severity: Food poisoning can sometimes cause more severe symptoms

Both conditions can lead to dehydration, which requires careful monitoring.

Treatments

Here are the treatments for both food poisoning and stomach bugs:

The general treatments that are certainly applicable to both food poisoning and stomach bugs are:

Rest: Allow the body to recover

Hydration: Drink plenty of fluids to replace lost electrolytes

Water, clear broths, oral rehydration solutions

Gradual reintroduction of food: Start with bland, easy-to-digest foods

BRAT diet (Bananas, Rice, Applesauce, Toast)

Over-the-counter medications:

Anti-diarrheal medications (e.g., loperamide)
Anti-nausea medications (e.g., bismuth subsalicylate)

Specific treatments:

Food Poisoning:

Antibiotics: Only if bacterial infection is confirmed and severe
Hospitalisation: For severe cases with extreme dehydration
Activated charcoal: In some cases of toxic ingestion

Stomach Bug:

Primarily supportive care: As antibiotics are ineffective against viruses

Probiotics: May help restore gut balance

When to seek medical attention:

Persistent vomiting
Bloody stools
High fever (above 101.5°F or 38.6°C)
Severe abdominal pain
Signs of dehydration (dark urine, dizziness, dry mouth)
Symptoms lasting more than 3 days

Preventions

There are certain specific and common preventions of food poisoning and stomach bugs.

Food Poisoning Prevention:

Proper food handling:

Wash hands before and after handling food
Clean utensils and surfaces thoroughly
Separate raw and cooked foods

Cook foods to safe temperatures:

Use a food thermometer
Ensure meats are fully cooked

Refrigerate promptly:

Store perishables within 2 hours of purchasing or cooking
Keep refrigerator below 40°F (4°C)

Avoid high-risk foods:

Raw or undercooked meats, eggs, and seafood
Unpasteurised dairy products

Wash fruits and vegetables thoroughly

Be cautious when eating out

Stomach Bug Prevention:

Practice good hygiene:

Wash hands frequently with soap and water
Use alcohol-based hand sanitisers when soap isn't available

Avoid close contact with infected individuals

Disinfect contaminated surfaces: Use bleach-based cleaners on high-touch areas

Be careful with food and water when travelling:

Drink bottled water in areas with poor sanitation
Avoid raw foods in high-risk areas

Get vaccinated: Rotavirus vaccine for infants

Handle and dispose of diapers properly

Stay home when sick to avoid spreading the virus

Wash laundry thoroughly, especially if contaminated

Common preventions for both:

Maintain a strong immune system:

Eat a balanced diet
Get enough sleep
Exercise regularly
Manage stress

Be vigilant about hand hygiene, especially before eating and after using the bathroom

While these guidelines can help, it's not always easy to distinguish between the two. When in doubt, one should consult a healthcare professional for an accurate diagnosis and appropriate treatment.

Frequently Asked Questions About Stomach Bug or Food Poisoning

Q. Can both a stomach bug and food poisoning be contagious?
A. Yes, a stomach bug (viral gastroenteritis) is highly contagious and spreads through close contact, while food poisoning can be contagious if caused by certain bacteria or viruses, but is mainly spread through contaminated food.

Q. What are the risk factors for getting a stomach bug?
A. Risk factors include close contact with an infected person, touching contaminated surfaces, and poor hand hygiene.

Q. What are the risk factors for food poisoning?
A. Risk factors include consuming improperly cooked or stored food, eating food from unsafe sources, and having a weakened immune system.

Q. When should I seek medical attention for a stomach bug or food poisoning?
A. Seek medical attention if you experience severe dehydration, high fever, bloody stools, persistent vomiting, or symptoms lasting more than a few days.

Q. Can both a stomach bug and food poisoning be prevented?
A. Yes, prevention includes good hygiene practices, such as regular hand washing, safe food handling, cooking food thoroughly, and avoiding contaminated food and water.

Reference links:

https://www.healthline.com/health/digestive-health/stomach-bug-or-food-poisoning
https://www.webmd.com/digestive-disorders/ss/slideshow-stomach-flu
https://www.memorialcare.org/blog/it-food-poisoning-or-stomach-bug
https://my.clevelandclinic.org/health/diseases/12418-stomach-flu