Stools once a day, but the stools are not shaped and do not have diarrhea, may be caused by indigestion, chronic enteritis, intestinal tumors and so on. 1. Indigestion: It will cause the food in the stomach to enter the intestines in a semi-digested condition, and the intestines cannot absorb the nutrition in the food residue completely, causing unshaped stools. 2. Chronic enteritis: it will cause the absorption and secretion function of the intestinal tract to be adversely affected, resulting in most of the water in the food residue not being absorbed, causing irregular bowel movements. 3. Intestinal tumor: it will lead to the change of defecation habit and affect the gastrointestinal function, which will cause the symptom of unformed stool in the early stage. If you have bowel movement once a day, but the bowel movement is not shaped, and there may be other reasons for not having diarrhea, it is recommended that you go to the regular hospital to receive timely examination, and according to the results of the active treatment under the guidance of specialists, so as to avoid affecting your health.