What is acute gastroenteritis?

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Acute gastroenteritis is a sudden inflammation or swelling in both the stomach and the intestines. It can be understood as the rapid onset of diarrhea (bowel movements become loose and watery) with or without nausea or vomiting. In most cases, it is caused by a viral agent.
What is gastroenteritis
In simple words, it just means inflammation of the gastrointestinal tract (mainly stomach and the bowels). The most common cause for gastroenteritis is viral. When you get a viral infection of the gut, your gut becomes inflamed. Then, the gut is unable to absorb nutrients and water, causing symptoms of vomiting, diarrhea and abdominal pain sometimes.
Here are the detailed information on the disease:

Gastroenteritis (aka. stomach flu), is inflammation of the stomach and small intestine. It is usually caused by viruses. However, bacteria, parasites, and fungus can also cause gastroenteritis. In adults, norovirus and Campylobacter are common causes. In children, rotavirus is the most common cause of severe disease.

It can be spread through different channels, for example, through contact with someone who has the virus, through eating contaminated food or drinking water or keeping unwashed hands after going to the bathroom or changing a diaper. Common symptoms may include diarrhea, vomiting, Fever, lack of energy, abdominal pain and dehydration.

It is OK if you don’t get a confirmed diagnosis since treatment is generally the same with or without a confirmed testing result. Treatment involves getting enough fluids. For mild or moderate cases, one can be treated with drinking oral rehydration solution (a combination of water, salts and sugar). For severe cases, intravenous fluids given by a nasogastric tube are required.

To prevent yourself from developing the disease, you can simply apply the following tips: washing your hands with soap, drinking clean water, proper disposal of human waste and breastfeeding babies instead of using formula. Antibiotics are generally not needed. However, antibiotics are recommended for young children with a fever and bloody diarrhea.
It's called stomach flu, means your stomach had a flu-like infection but will recover in a week. A stomach flu may need no medical treatment, self-care with fasting, fluid-rich diet, rest may be good enough. It takes a week or so to recover, similar to a normal respiratory tract flu.