The causes of hard stools may be the following: 1, dietary problems, such as a dry diet, less water, love to eat spicy, meat, puffed food, fruits and vegetables and other foods eat less, may lead to hard stools. 2, bad bowel habits, if the habit of a long time after the stool, may lead to the occurrence of such a situation of hard stools. 3, intestinal system diseases may also appear stool The symptoms of hard and coarse stool, such as acute and chronic enteritis, intestinal tuberculosis, ulcerative colitis, intestinal tumors and other diseases. The most common intestinal diseases are diarrhea, small stools, and hard stools are rare, but the possibility of disease cannot be ruled out, and further examination is needed to clarify.