Difference Between Gastro & Food Poisoning

Introduction

Woke up with stomach cramps, nausea or an urgent trip to the bathroom? It’s easy to assume it’s food poisoning, but it could also be viral gastro — their symptoms are so similar that many people confuse the two.

This article explains the difference between gastro and food poisoning, including its causes, symptoms and treatment. Knowing what you’re dealing with can help you manage it properly and feel better sooner.

What is gastro?

Gastroenteritis, often shortened to "gastro", is an infection that affects the stomach and intestines. It’s typically caused by a virus but can sometimes be bacterial or parasitic. Gastro symptoms usually appear suddenly and may include nausea or vomiting, watery diarrhoea, stomach cramps, mild fever, headache and fatigue.

How long does gastro last?

Most people recover within one to three days, though in some cases, it can take up to a full week. If symptoms last more than a few days or if you notice signs of dehydration (like dry mouth or dizziness), it’s best to see a doctor. 

How to treat gastro

There’s no specific cure for viral gastro, but symptoms can usually be managed at home. 

Rest and hydration are key, so it’s important to sip water or electrolytes regularly. Stick to bland foods and avoid dairy, caffeine and fatty foods, as they can make symptoms worse. If you're unsure what to eat when you have gastro, start with small, plain meals and slowly reintroduce food as your stomach settles.

Some people also find relief from natural remedies like diluted apple cider vinegar, which may help soothe digestion. Just be sure to check with a healthcare professional before trying anything new. Good hygiene is also important because washing your hands regularly helps reduce the risk of spreading the virus to others. 

Is gastro contagious?

Yes. Viral gastro spreads easily through contact with infected people, surfaces or food. It’s common in shared environments like schools, offices and childcare centres.

What is food poisoning?

Food poisoning happens when you consume food or drinks that contain harmful bacteria, viruses or toxins. It’s usually linked to undercooked meat, unwashed produce or contaminated food preparation areas.

Food poisoning symptoms

Food poisoning symptoms can include sudden nausea and vomiting, stomach cramps, diarrhoea, fever or chills and general weakness or muscle aches. These symptoms often come on quickly, sometimes within hours of eating contaminated food.

How long does food poisoning last?

Most people feel better in less than 24 hours or within few days, depending on the cause and individual health. Some cases may take a little longer to clear up, especially if the illness is caused by certain bacteria or toxins. If symptoms are severe or ongoing, such as persistent vomiting, high fever or blood in the stool, it's best to see a doctor.

How to treat food poisoning

Treatment for food poisoning usually focuses on relieving symptoms and staying hydrated. Drink plenty of fluids, including oral rehydration solutions or clear broths, to replace what’s lost through vomiting and diarrhoea.

Rest is also important, as your body needs time to recover. Avoid solid food initially and when you’re ready, reintroduce bland foods like dry toast or rice.

In some cases, antibiotics or hospital care might be required, particularly for children, older adults or people with weakened immune systems.

Is food poisoning contagious?

Most of the time, food poisoning is not contagious. However, some bacteria can be spread through poor hygiene, especially in shared kitchens or bathrooms. Regular handwashing and proper food handling can help prevent passing the bacteria to others.

Food poisoning vs. gastro: key takeaways

If you’re trying to figure out the difference between gastro and food poisoning, remember this: gastro is often viral and contagious, while food poisoning comes from eating contaminated food and isn’t usually spread between people. The symptoms can be nearly identical, but the source, treatment and recovery time can vary.

Need time to recover? Medical Certificates Australia can help

Whether you’re suffering from gastro, food poisoning or blocked ears from a cold, one thing’s for sure: you need time to recover. Taking a day or two off work can make a real difference in how quickly you bounce back and prevent spreading illness to others. If you’re unsure whether your symptoms are enough to take a sick day, this list of common reasons to call out sick can help you decide.

Medical Certificates Australia makes it easy to get the time off you need without the hassle. After a short virtual consultation with a qualified, AHPRA-registered doctor, you’ll receive a valid medical certificate sent straight to your inbox. The process is quick, secure and fully online, so you can focus on feeling better instead of organising appointments.

If you have any questions, get in touch with Medical Certificates Australia for more information.