When diagnosed with acute gastroenteritis, staying hydrated with warm water or oral rehydration solutions is key, while food is less important.
If you have been diagnosed with acute gastroenteritis, or have nausea/vomiting/diarrhoea/abdominal pains after eating something, keeping hydrated is the most important treatment. Food is not important: people can survive on average 2 months without any food, but only 3 days without water!
Reaching moderate to severe dehydration is potentially life-threatening, and may lead to a visit to the emergency department for intravenous fluid replacement therapy. On the other hand, as long as you are able to keep fluids down, and pass urine normally (and other causes of symptoms are excluded): you can diarrhoea 15 times a day, but your life won’t be in danger for the typical 2-5 days this would last.
Warm water is the simplest and most soothing for a gastro stomach, has been recommended as the ideal beverage in the 3000+ years of Chinese Medicine. Warm water is especially versatile in that adding a small amount of honey will also provide some sugar and electrolyte intake to aid recovery.
Other recommended fluids include lemonade, non-alcoholic ginger beer/ale, and ginger tea, due to their mild effect on nausea, the sugar content, and adding variety to the large amount of water intake required. Sports drinks, diluted fruit juice (1 part to 4 parts water) are also ok for when there isn’t obvious signs of dehydration. These should be drunk at room temperature, as cold/icy drinks may cause reactive spasms of the stomach, and lead to vomiting.
Hydralyte is a common brand of medical oral rehydration solution that is readily available in pharmacies and supermarkets in Australia, and is the preferred choice for oral fluid replacement in liquid or frozen in hospitals due to the ideal amount and concentrations of sodium and glucose for rehydration for patients without existing electrolyte or glucose imbalance.
Initial volume for oral rehydration aim approximately 100 ml every 15 minutes. Having frequent, small amounts of fluid is easier to stomach (pun) especially when nausous/vomiting than a large volume that stretches the stomach. If this amount is tolerated (as in not vomiting back up), then can be continued till urine is passed. Work towards total daily volume of 2-3 L during the days of illness.
If persistent vomiting is preventing adequate oral fluid intake, starting with 20-30 ml over 15 minutes, or sucking on an ice cube/ice pop/frozen Hydralyte is an option to get necessary fluids in. If even that is not tolerated, consult your usual doctor for effective prescription medication for nausea/vomiting in this context, such as domperidone or metoclopramide, taken 3 times a day to help restart the natural gut peristalsis, and preventing the backward movement that leads to nausea and vomiting.
Medications that stop diarrhoea are generally not recommended. Common medications such as loperamide (Gastro-Stop, Imodium) stops the gut movement and hence reduces or stops diarrhoea, but this also means anything you put into the stomach is unable to move down the bowels, and may cause or worsens vomiting. Do not take antibiotics unless the causative organism has confirmed and is susceptible, or on your doctor’s advice once harms vs benefits have been considered.
It is important to be aware of the symptoms and signs of the stages of dehydration. If you are not able to manage the fluid intake, such as due to excessive vomiting, then it is recommended to seek medical assessment at the moderate stage, and you MUST see a GP or go to emergency department by the severe stage.
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