What Causes Vomiting and Diarrhea? 


Vomiting and diarrhea (both loose, watery gastrointestinal expulsions) are often caused by a GI infection – commonly known as a stomach “bug” or flu – and lead to the rapid loss of fluid and electrolytes.

What are the Common Symptoms of Vomiting and Diarrhea?

Dehydration is one of the common side-effects of vomiting and diarrhea. Some of the symptoms associated with vomiting and diarrhea include:

  • Nausea
  • Fever
  • Loose stool
  • Abdominal pains
  • Bloating

In most cases, vomiting and diarrhea just cause discomfort and many people stop experiencing symptoms after three days. However, taking Hydralyte helps manage the dehydration associated with vomiting and diarrhea.

Consult your physician if vomiting, diarrhea, or fever persist for longer than 24 hours. For children under two years of age, consult your physician. Consult a healthcare practitioner if you have any medical problems relating to kidney or heart function, blood pressure, gastrointestinal function or show signs of severe dehydration including shock or are unable to drink. Consult a healthcare practitioner for prolonged exercise (3 hours or more) or recurring dehydrating conditions.

Did you know?

Dehydration is the biggest health risk associated with vomiting and diarrhea.

What is stomach flu and what are the symptoms?

The stomach flu is an infection of the gut, which often causes vomiting and diarrhea. It can also cause you to feel tired and have a slight fever.

Viral or bacterial infections are often to blame. You usually catch the stomach flu if you eat or drink food or water that is contaminated with infections (caused by bacteria, viruses or parasites). You can also catch it if you come in contact with a person who is unwell, such as by breathing in vomit particles that spray into the air (they can fly as far as 10 feet!).

Other names for gastrointestinal infections include – gastro, food poisoning, travelers’ diarrhea, stomach bug, stomach flu, gastro distress, gastro flu, norovirus, Montezuma’s revenge, and gastroenteritis.

An average male can lose up to 3 L of fluid during a case of the stomach flu*! This loss of water and electrolytes causes mild to moderate dehydration.

*Mild dehydration, 4% fluid deficit, in a 80 kilos adult

Dehydration is the biggest health risk associated with the stomach flu and can occur more quickly for small babies, children, and the elderly. If dehydration becomes severe, you can end up in the hospital on a fluid drip.

Did you know?

Activating your sodium glucose pump is a rapid way to rehydrate. Learn More »

Relieving Dehydration from Vomiting and Diarrhea

When managing dehydration as a result of vomiting and diarrhea, the most important step to take is to replenish the fluids and electrolytes your body is losing. By staying properly hydrated, you can relieve some of the mild to moderate symptoms of dehydration.

Avoid foods and drinks that may aggravate your gastro symptoms. Foods that are greasy, high in fat, or very high in fiber can make your diarrhea worse. Try to stay away from dairy products such as milks and cheeses, as your body might have trouble digesting them. Choose a diet of mainly liquids that you sip slowly, to ensure you stay hydrated.

Hydralyte Products for Managing Vomiting and Diarrhea

With Hydralyte’s wide range of great tasting formats and flavours, you can choose your best solution for replacing fluid and electrolytes lost due to vomiting or diarrhea.

Click below for dosage instructions:

Hydralyte’s oral fluid chart

When managing dehydration in children or the elderly, it may be helpful to track and measure fluid intake and losses.


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