The dry and hard stool is mainly due to the following reasons: 1, dietary factors, eating too little in the daily diet, the intake of food is not enough, which will cause too little digestive residue, resulting in dry and hard stool. And consume too much dry, alkaline food, can cause dry and hard stool. The stool is not easy to discharge, and the wrong way to drink water is also likely to cause dry and hard stool.