Dryness of the first part of the stool and normalization of the second part are associated with constipation, dietary habits, and irritable bowel syndrome. Many people suffer from constipation. During an episode of constipation, the feces stays in the intestines for a relatively long period of time, and will be over-absorbed of water leading to over-drying of the feces. After the first half of the dry feces is discharged during defecation, the newly produced feces will also be discharged along with the feces, and the newly produced feces will remain in the intestines for a relatively shorter period of time, so it will be more normal. Dietary habits are a common cause of changes in the nature of the stools. After eating meat followed by vegetables, the stools will form a section that is dry and a section that is normal. Irritable bowel syndrome will affect the peristaltic function of the intestines because of the disease, and some patients with irritable bowel syndrome will have constipation and diarrhea alternately, and the first part of the stool will be dry and the second part will be normal.