Loud bowel sounds and constipation may be caused by constipated irritable bowel syndrome, functional dyspepsia, incomplete intestinal obstruction and so on. 1. Constipation-type irritable bowel syndrome: It is a gastrointestinal disease caused by intestinal peristaltic dysfunction, due to peristaltic dysfunction, the patient’s intestinal matter can not be discharged and constipation occurs. After constipation, the intestinal tube is distended and the intestinal pressure increases, which leads to the patient’s loud bowel sounds. 2. Functional dyspepsia: Functional dyspepsia is a common functional gastrointestinal disorder in clinic, and the function of the stomach and duodenum will be disturbed after the onset of the disease. Patients usually show symptoms such as fullness and bloating after meals, increased intestinal sounds, constipation and so on. 3. Incomplete intestinal obstruction: a type of intestinal obstruction in which the intestinal tract is not completely obstructed and part of the intestinal contents can still pass through the intestinal lumen. After the obstruction, the contents of the intestine cannot be emptied in time, which may lead to a large amount of gas in the intestine and increase the intestinal pressure, which may lead to loud bowel sounds and constipation. To summarize, the causes of loud bowel sounds and constipation are different, and it is recommended that the patient should consult a doctor in time for examination, and follow the doctor’s instructions after clarifying the specific cause of the disease.