Gastroenteritis typically goes away on its own within a day or two, and most people don't require treatment. Some cases can be severe, however, and complications can arise. Get care at an emergency room if you: Are vomiting blood.

How long does gastroenteritis last for?

Depending on the cause, viral gastroenteritis symptoms may appear within one to three days after you're infected and can range from mild to severe. Symptoms usually last just a day or two, but occasionally they may persist as long as 10 days.

Will gastroenteritis go away on its own?

Although infectious gastroenteritis usually resolves on its own, in some cases it can lead to severe consequences, chiefly through dehydration. Worldwide, 1.45 million people die from infectious gastroenteritis each year. Symptoms can occur as soon as 30 minutes after exposure to the culprit organism or toxin.