Bacterial gastroenteritis is a gastroenteritis infection caused by various bacteria, including nausea, vomiting, abdominal pain, diarrhea, loss of appetite and other symptoms. 1. Nausea and vomiting: when the stomach and intestines are infected by bacteria, it will affect the effective absorption of food. When eating a lot of food, it cannot be absorbed effectively, which will lead to the formation of blockage in the gastrointestinal tract, resulting in the inability of food residues to be discharged from the body, and finally the symptoms of nausea and vomiting. 2. Abdominal pain, diarrhea: the bacteria that cause gastroenteritis secrete toxins in the intestines, which stimulate the intestinal mucosa, and then secrete a large amount of water and electrolytes, which remain in the intestinal lumen and cause diarrhea, and may also induce intestinal spasms when stimulating the mucosa, resulting in the symptom of abdominal pain. 3. Decrease in appetite: the bacteria that trigger gastroenteritis stimulate the gastrointestinal tract to reduce the digestive capacity, when eating, digestion and absorption is slower, as well as the gastrointestinal tract is blocked, resulting in the discharge of food residue is affected, which will lead to do not want to eat, decreased appetite, it is recommended to go to the regular hospital in a timely manner to be treated. If the patient suffers from bacterial gastroenteritis, there may also be fever, should seek medical attention in time, under the guidance of the doctor for regular treatment, not blindly use drugs, in daily life should eat a light diet, eat some easy to digest food, and develop regular habits.