Overview

Bacteria, viruses, parasites, or fungi that affect the digestive tract cause gastrointestinal infections. These infections usually affect the stomach and intestines, making it hard for the body to digest food and maintain fluid balance. GI infections are a common cause of sudden digestive problems worldwide and can affect anyone. They are spread by eating or drinking contaminated food or water, not washing your hands properly, or being close to someone who is sick. Most infections are mild and resolve on their own, but some can cause serious dehydration or other complications, especially in children, older adults, and people with weakened immune systems.

Symptoms
Diarrhea, stomach cramps, nausea, vomiting, and fever are some of the most common signs. People may lose their appetite, feel bloated, and be tired. Sometimes stools may contain blood or mucus. If you vomit or have diarrhea for a long time, you could become dehydrated, which can cause a dry mouth, dizziness, less urination, and weakness. Symptoms usually appear within a few hours to a few days after exposure.

Causes
Bacteria such as Salmonella or E. coli, viruses such as norovirus or rotavirus, and parasites such as Giardia are the most common causes of GI infections. Contaminated food, dirty water, improper handwashing, and improper food handling are all major causes. Going to places with poor sanitation and eating food that isn't cooked through raises the risk of getting sick.

Diagnosis
A diagnosis is made based on a person's medical history, symptoms, and a physical exam. Stool tests are often used to find the organism that caused the problem. Blood tests can check how severe dehydration or an infection is. In cases that last a long time, imaging or endoscopy may be needed to rule out other problems.

Treatment
The goal of treatment is to stop dehydration and control symptoms. It is very important to drink fluids and electrolytes to rehydrate. Many mild infections resolve on their own without special treatment. If a bacterial or parasitic cause is found, antibiotics or antiparasitic drugs may be given. Rest, a light diet, and good hygiene help you get better and stop the spread.

Most GI infections have a good prognosis, with symptoms resolving within a few days. Medical care is needed for serious cases. Good hygiene, safe food handling, and proper sanitation all lower the risk of getting sick and getting sick again.