Hard stool before and soft stool after may be a physiological phenomenon, may also be the manifestation of constipation, and may also be the manifestation of intestinal polyps, intestinal tumors and other diseases. If the symptoms persist, it is necessary to consult a doctor in time to clarify the cause of the disease. 1. Physiological phenomenon: During the process of stool formation, the stool near the anus is formed too early and stays in the intestines for a long time, and the water is over-absorbed, which makes the stool dry; while the newly formed stool is soft because the water does not have time to be over-absorbed, so it will be soft in form, so there will be a situation of hard stool and soft stool in the defecation, which belongs to the normal physiological phenomenon. 2. Constipation: all kinds of functional or organic causes of constipation, will also appear in the stool before the hard after the soft phenomenon, and the above principle is the same, only the degree of constipation patients more serious. If the constipation time is long, and even discharged stool for sheep dung hard granular. 3. Disease: If the stool is hard and then soft, accompanied by other uncomfortable symptoms such as blood in the stool, abdominal pain, etc., consider the possibility of occupying adverse lesions such as intestinal polyps or intestinal tumors, etc., and go to the hospital in time to do the relevant examinations such as colonoscopy, etc., and take biopsies from the suspected areas to send to the pathology to confirm the diagnosis if necessary. Hard and soft stools are associated with failure to defecate in time, constipation, etc. Drinking more water, increasing dietary fiber intake, and developing a regular bowel habit can help alleviate this phenomenon. If the stool is hard and then soft for a long time, and accompanied by other uncomfortable symptoms, we should be alert to pathological causes, and should consult a doctor for examination in a timely manner.