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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.
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.
Causes of constipation may include faecal impaction and bowel obstruction, which may in turn be caused by ileus, intussusception, volvulus. Inflammatory bowel disease is a condition of unknown aetiology, classified as either Crohn's disease or ulcerative colitis , that can affect the intestines and other parts of the gastrointestinal tract.
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]
Rotaviruses are the most common cause of diarrhoeal disease among infants and young children. [1] Nearly every child in the world is infected with a rotavirus at least once by the age of five. [2] Immunity develops with each infection, so subsequent infections are less severe. Adults are rarely affected. [3]
E.coli causes intestinal infections, some intestinal infections include diarrhea, fever and abdominal pain. Most severe cases can lead to bloody diarrhea, dehydration or even kidney failure. People with weakened immune systems, young children, older adults and pregnant women are at increased risks for developing these complications.
The cause of dysentery is usually the bacteria from genus Shigella, in which case it is known as shigellosis, or the amoeba Entamoeba histolytica; then it is called amoebiasis. [1] Other causes may include certain chemicals, other bacteria, other protozoa, or parasitic worms. [2] It may spread between people. [4]