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Gastroenteritis is usually caused by viruses; [4] however, gut bacteria, parasites, and fungi can also cause gastroenteritis. [2] [4] In children, rotavirus is the most common cause of severe disease. [10] In adults, norovirus and Campylobacter are common causes.
Norovirus is the leading cause of foodborne illness in the U.S., causing 58% of foodborne illnesses each year, according to the CDC. MORE: What to know about the symptoms and treatment of ...
Depending on the cause of the inflammation, symptoms may last from one day to more than a week. Gastroenteritis caused by viruses may last one to two days. Most people recover easily from a short episode of vomiting and diarrhea by drinking clear fluids to replace the fluid that was lost and then gradually progressing to a normal diet.
Babies, young children and the elderly pose the highest risk of harm from norovirus—and again, much of that comes from the dehydration that norovirus symptoms can cause.
There are many causes of infectious diarrhea, which include viruses, bacteria and parasites. [29] Infectious diarrhea is frequently referred to as gastroenteritis. [30] Norovirus is the most common cause of viral diarrhea in adults, [31] but rotavirus is the most common cause in children under five years old. [32]
Common causes of pain in the abdomen include gastroenteritis and irritable bowel syndrome. [2] About 15% of people have a more serious underlying condition such as appendicitis, leaking or ruptured abdominal aortic aneurysm, diverticulitis, or ectopic pregnancy. [2] In a third of cases, the exact cause is unclear. [2]
Less common causes of this symptom profile are carcinoid syndrome, microscopic colitis, bacterial overgrowth, and eosinophilic gastroenteritis; IBS is, however, a common presentation, and testing for these conditions would yield low numbers of positive results, so it is considered difficult to justify the expense. [75]
Members of a relatively new virus family, the astroviridae, astroviruses are now recognised as a cause of gastroenteritis in children, whose immune systems are underdeveloped, and elderly adults, whose immune systems are generally somewhat compromised.