Stool is mainly caused by constipation, poor living habits and dietary structure, intestinal obstruction and other gastrointestinal diseases may trigger constipation. 1. Bad habits: If you don’t like to drink water and have bad bowel habits, and you don’t have bowel movements, it may lead to repeated absorption of water in the intestinal tract, and finally cause dry stools, which are manifested as grains of stools. 2. Poor dietary structure: If the food you eat lacks dietary fiber and is relatively fine, leaving less food residue in the intestines, it may also lead to dry and hard stools, making the stools become a pellet-shaped ball. 3. Gastrointestinal diseases: Gastrointestinal diseases such as intestinal obstruction, gastrointestinal dysfunction, poor digestion, etc. may lead to a buildup of stool in the intestines, so that the water in the stool is repeatedly absorbed by the intestinal tract, and ultimately the formation of dry, granular stools. The causes of granular stools are many, and if the symptoms still cannot be improved after adjusting lifestyle habits, if the symptoms persist for a long time, or if they are accompanied by other uncomfortable symptoms, it is recommended to see a doctor in the hospital, and to have the appropriate treatment under the doctor’s guidance.