The causes of low stool volume without constipation usually include gastrointestinal dysfunction, low intake of food and other intestinal diseases, etc., which need to be treated in time once detected. 1. Gastrointestinal dysfunction: If gastrointestinal dysfunction occurs, it can cause low stool volume and not constipation, and its symptoms can usually be manifested as abdominal bloating, abdominal pain, nausea and vomiting, etc., and it will also affect the daily diet and so on. 2. Eating less: If the human body consumes less food for a long time, it will lead to a decrease in the amount of food residue in the intestines, which will lead to a decrease in the amount of stool discharged. 3. Other intestinal diseases: intestinal inflammation or intestinal tumors and other intestinal diseases will slow down the peristalsis of the intestines, which will cause complete or incomplete obstruction of the intestinal lumen, and ultimately lead to less stools, but not yet progressed to the occurrence of constipation. If there is a long-term situation of low stool volume without constipation, you should consult a doctor in time.