The most common symptoms of acute gastroenteritis are frequent diarrhea, abdominal pain, vomiting, stomach discomfort, and in severe cases, fever and dehydration. Frequent diarrhea occurs due to acute inflammation of the gastrointestinal mucosa, hypersecretion of glands and increased water in the intestinal tract. It can manifest as watery diarrhea, or pus and mucus-like, and there can be undigested food residues. A routine stool examination can reveal a large number of white blood cells and pus cells. Due to bacterial inflammatory infection, spasm of the intestinal smooth muscle can occur, and gastrointestinal colic can occur, which can be clinically manifested as paroxysmal abdominal pain, and abdominal pain and diarrhea can alternate. Due to the release of toxins from bacterial infection, systemic toxicity symptoms can occur, which can be manifested as nausea and vomiting, as well as chills and fever, mostly manifested as high fever, and the body temperature can reach a high level in a short period of time. Due to frequent vomiting and diarrhea, the body can show signs of dehydration, with reduced urine volume or closed urine, deep sunken eye sockets, poor skin elasticity, wet and cold skin, decreased blood pressure, and if the symptoms of dehydration are severe, toxic hypovolemic shock can occur, requiring timely medical treatment. In short, the symptoms of acute gastroenteritis are relatively easy to identify, and once found, it is important to seek medical attention in a timely manner.