Irritable bowel syndrome is characterized by symptoms of abdominal pain, diarrhea, constipation, and change in fecal character, which may be accompanied by urinary frequency, urinary urgency, dysuria, acid reflux, belching, and other symptoms. 1. Abdominal pain: the degree of abdominal pain varies, and the site is mostly found in the left lower abdomen, lower abdomen, and periumbilical region. The range of pain can be limited to one place or diffuse the whole abdomen. The nature of abdominal pain varies, with sudden or paroxysmal abdominal cramping pain as the main cause, mostly induced after eating cold and raw food, and can be relieved after defecation and bowel movement, the pain will not develop further, and the severity of pain will not be further aggravated. 2. Diarrhea: usually diarrhea does not occur at night, but occurs when waking up in the morning, which can be manifested as alternating diarrhea and constipation, and the feces contain a lot of mucus and are paste-like. Most of the diarrhea occurs after eating and is induced by eating. The number of bowel movements is 3-5 times/day, and in severe cases, it can be more than 10 times/day. 3. Constipation: the feces are characterized by dryness and small amount, in the form of thin rod or sheep’s dung, with a lot of mucus adhering to the surface of the feces, and the constipation is characterized by the development of constipation from intermittent to persistent. 4. Change of fecal character: fecal appearance is mainly in the form of soft stool, thin paste, thin watery. The feces are mostly with mucus, without pus and blood. If the above conditions exist, you should consult the doctor in time, under the guidance of the doctor, complete the relevant examinations to identify the cause of the disease, so as to avoid delaying the condition.