"Gastrointestinal stress syndrome", namely "irritable bowel syndrome", is a continuous or intermittent intestinal dysfunction disease, which is characterized by abdominal pain, bloating, defecation habits and/or changes in stool characteristics, but lacks structural and biochemical abnormalities in the gastrointestinal tract.

Irritable bowel syndrome is a common and frequently-occurring disease in gastroenterology, which mainly occurs in the prime of life. Its clinical manifestations include abdominal pain, abdominal distension and changes in defecation habits.

The clinical manifestation of diarrhea irritable bowel syndrome is intermittent diarrhea, which is induced by eating. After fasting for 72 hours, the symptoms disappeared and there were no symptoms at night. The clinical manifestations of constipation irritable bowel syndrome include decreased defecation frequency, abnormal defecation, dry stool and mucus in stool.

The clinical manifestations of irritable bowel syndrome with alternating diarrhea and constipation include abdominal distension and abdominal pain, increased or decreased defecation times, and relieved symptoms after defecation.