There may be physiological reasons such as improper diet and pathologic reasons such as gastrointestinal tract dysfunction. 1. Physiological reasons: unreasonable diet, such as bananas, green vegetables and other vegetables and fruits intake is too small, less water, resulting in the front of the stool is absorbed more water, that is, the stool is hard at the beginning and soft at the back. 2. Pathological reasons: some intestinal diseases can affect the formation and discharge of feces, resulting in hard stools at the beginning and soft stools at the end. For example, intestinal dysfunction, intestinal polyps, intestinal tumors and other diseases may cause excessive absorption of water in the front of the stool, thus causing hard stool and soft stool. There may be other reasons for soft stools, so please go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.