IBS can be divided into acute gastroenteritis and chronic gastroenteritis. The main symptoms of acute gastroenteritis are nausea, vomiting, diarrhea, etc. The main symptoms of chronic gastroenteritis are recurrent diarrhea and abdominal pain. 1. Acute gastroenteritis: it can be caused by food poisoning, amoeba infection, Giardia infection and so on. All can cause abdominal pain, diarrhea and other symptoms. Food poisoning patients can develop within a few hours of eating, and in severe cases, mucus, pus and blood stools can appear; amoeba infection can cause fishy, jam-like stools; Giardia infection can cause explosive watery stools, accompanied by foul odor, and there are abdominal distension, farts, nausea, vomiting and so on. 2. Chronic gastroenteritis: it can be caused by tuberculosis infection, autoimmunity and other factors. Tuberculosis gastroenteritis is often manifested as long-term, recurrent abdominal pain, diarrhea, sometimes can be manifested as diarrhea and constipation alternately; autoimmune gastroenteritis, most of the chronic course, manifested as long-term abdominal pain, bloating, diarrhea or constipation. Patients with gastroenteritis are advised to seek timely medical attention for a clear diagnosis and targeted treatment under the guidance of a doctor.